Amp Hours??? Battery Capacity Explained
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- Опубліковано 23 гру 2016
- *This battery has been updated and remastered for 2023 - click here to see: • BATTERY BASICS - Batt... *
What the heck is an amp hour and why are there so many sizes of batteries? #batterycapacityexplained #whatisbatterycapacity #whatisamphour #whatiskilowatthour
If anyone has wondered what Ah means or what is the difference between 20 hr and 10 hr, this video will attempt to explain. We all use batteries all the time but most people don't understand how much energy they hold or how long they will last.
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Thanks, i am even more confused than before.
Sorry. What part is confusing?
Efegzqwerty
Me 2
@@LDSreliance im now getting into car audio and I hear these big car audio guys always talking about amp hours, so im jus wondering does more amp hours equals more power for the system?
Can you work out ah on battery that has half the original cca? Im assuming divide original ah by 2!is that correct? Any reply appreciated thanks from Australia!
Dude I have to say I just got a lil solar panel and a deep cycle battery and this actually helped me a lot with understanding thank you seriously
You are welcome! Glad you found it helpful and thanks for watching.
thanks for the helpful explanation and info
Thank you so much
Very short video but I got it. Good explanation
Good day, that's good information. I have an adaptor and data cable, but their ampere is different. The adaptor have higher ampere than the data cable. How could I compute WH? Will I sum the two amperes?
Very clear & useful. Thank you. :)
You are welcome. Glad it helped. Thanks for watching!
Thank you for this clear explanation!
You are welcome. Thanks for watching!
Do you have a video or can explain to me what charger you would use for a 12v 18ah battery where the battery would last the longest not after the quickest charge? say if the battery was completly dead say it charges it in 5 or 6 hours.
Thanks for the reply! I asked my friend and he said the same thing. Now I don't understand if I have 8 12v 150w panels in series I should have two charge controllers or do they make them go past 96v? I'm sorry that's my last question because he is older I don't think he knew
You don't want all those panels in series making 96v. You want them in parallel or series and parallel. Again, it depends on what you are trying to power. But 96v is unusable by almost any inverter or directly powered load. You want 12v, 24v, or 48v.
You will have to organize the panels into what is called "strings" and then use a large charge controller to handle them OR use multiple smaller ones, one on each string.
Love your videos! I have a question if i have 1200w of solar for a rv running 12v batteries how many amp hours will that 1200w system need?
Thanks for the support!
I think you are answering the question backwards. What loads are you trying to power with these batteries? Having 1200 watts of solar is great and that is more than I have. But it all comes down to how many kWh per day you are consuming or desire to consume.
Best answer. This fellow need to gather all their appliances’ power rate and also need to know how many hrs they going to draw from 1200w solar system. Those information will help answer their question.
Thank You So Much For Explaining. Very Informative.
You are welcome. Thanks for watching!
Hi sir i want to ask you something i have 6v 4,5ah battrey, how long if i charge the battrey with 0,43 amps??
hello, this summer i want (for a small party) to run 2 krk rokit 5 monitors, my laptop and a dj controller all at the same time for about 6-8 hours. would this be possible with batteries and an inverter?
the manual of my krk's says that each monitor has a total power of 50 watt. some people told me this wouldn't wouldnt work even if i had 20 batteries, but i've seen other people on forums say something similar is very much possible.
also to be honest i do not really care about wrecking the battery as long as it doesnt become dangerous.
IS THIS POSSIBLE? PLEASE HELP :)
What is the reason for taking more charging current in the 200AH charger and how to reduce the charging current
So if I wanted to run multiple alternators say like 20 12v 300amps or 3.6kw high power car ones for 100kw at 12v to 15v at 6000amps would I need one for each or could I run it on one 12v 300amp battery so I don't blow it up other wise I'am going grafite and most would be for direct load use not storage use.
Short and sweet explanation 👍
Thanks! I am glad you liked it.
just hook it all up and turn it on - time it till it shuts off then ya know
Thanks for the video!
You are welcome! Thanks for watching.
Whoa. This guy sounds a lot like the guy in the "Casually Explained" channel here on UA-cam.
Maybe ot is the same guy?
@@misterboombasticable orrr....maybe it's a Mandela effect 🤔🧐
All white people sound the same 🤷🏾♂️
To be precise, ah is the quantity of charge contained in the battery, measured in coulombs. Multiply it by the voltage and you ll get the energy you can get from it, in joules.
Would you explain it more detail, I m too lazy to searching it in google
Can you use one single 12v 80amp battery instead of 4 12v 20amp batteries
okay now i get it, thanks man. But will the voltage remain constant through this discharging process?
No, the voltage will drop as the battery discharges. Lithium remains more stable on voltage longer but will still drop eventually. Lead acid drops steadily the whole time.
Great easy and simple video
Thanks! I appreciate that.
I have a 12v UPS battery that shows "506 watts/cell. 15 min" on the label.
How can I convert this to the standard 20 hour rating for AH?
Thanks
After waiting 9-months for an answer i think you can conclude that nobody has a clue.
Aweesome ! Thank you
You are welcome. Thanks for watching!
Thanks dude
I have 2 6V gel deep cycle batteries but no info label stating amp hours. Is there any way or a test to calculate battery amp hours?
You would have to simulate how the manufacturer's test and determine amp hour capacity. They fully charge the battery, let it rest a bit, then put a very specific current load on the battery and time how long it takes to discharge. They do it at various current levels and that will allow you to do the math you need to estimate the amp hours.
LDSreliance Thanks for your prompt reply. I apologise for taking so long to respond. I have my 2 6 volt gels in series. Is there a way to up the amps as well or is that only for 4 batteries? I could obtain 1 more of the same but don't know if you can use 3 together. They are MK 8GCC2 6 Volt gel. Your expertise would be greatly appreciated.Thanks again.
To double the voltage AND the capacity you would have to have 4 batteries. But putting batteries in parallel is not as good because they will charge and discharge unevenly. Try to only do series in battery banks for best results.
LDSreliance ty
I have two 12V 55Ah 420A car batteries connected together and i need to find out what alternator i should get. Does a 28V 55A alternator fits?
Yes as long as your batteries are connected in series for a 24V system.
Amp-hour ratings are approximate statements related to the stored energy capacity of a battery. Energy is power over time. If you look at the chart, each curve corresponds to discharging a battery at a different current. Power is current times voltage. If you multiply the voltage curves on the chart by the respective currents, you will get a new set of curves, the area under which is the energy drawn from the battery. For example, the leftmost curve shows a drain of 32.5 amperes. The initial power drain at this current is 11.7 X 32.5 = 380.25 watts and this power curve would be much higher than the rightmost curve showing a drain of .33 amps, initially at about 12.8 volts = about 4.2 watts. The area under the two curves should be about the same, the energy capacity of the battery. Actually the high curve may show a little less capacity because some of the energy is being dissipated as heat in the battery proportional to the square of the current. All this is too complex for the average consumer so amp-hours is used as a simple metric related to capacity.
power is energy over time
Sorry, @trueman, if I wasn’t clear. Technically, energy is the integral of power over time. If the power is constant, then energy is simply power times time, hence power is in watts or kilowatts, time is usually in hours in this case. Hence energy is often expressed in watt hours or kilowatt hours.
@@machine60 It's probably more accurate to say energy is the time integral of power. I suspect this is what you meant by "over time."
@@Fartboy87542 Correct and in your words power is energy divided by time when the power is constant.
Let say my bike use 12v 8ah. It should be no problem if i use 12v 7ah right?
Awesome channel!!!
Thanks, brother! I appreciate that a lot.
So if I am running 2 AGM GPL24 batteries which are 80amps each for a total of 160 amps how long will it run at 7.5amp DC draw. can you answer and put formula here. Thanks.. This is great..
Roughly 21 and a third hours. You can find formulas and explanation for the math here: www.powerstream.com/battery-capacity-calculations.htm
good video, about the lithiums in the EV's in comparison by using ledacid batteries to cover almost the entire floorboard with ledacid rechargeable, how do you think the performance could be? using specifically 'say' multiple 1,000cca ledacid truck batteries in series or both series and parallel connected to a electric fork truck motor? it'll definitely get warm maybe fan's underneath giving it a hydroplane effect, cooling the batteries. You could put some super capacitors before the ledacid batteries for extended life, and after the ledacid for drain. what do you think?
sorry I meant ledacid batteries. you can take a dead nickle rechargeable and put it on a lithium charger it'll charge quick try a AA the nickle holds 2 properties of being an electrolyte and acid, being able to take a quick charge acting like an electrolytic without the electrolytes, to prove this open a dead AA nickle then soak it in electrolytes the glue it back together. or if possible if you know the right spot drill a tiny hole then soak it.
Hy, i want to uprade my motorcycle 12V 35/35 W headlight with 35W HID kit and the battery capacity of motorcycle is 12V 3Ah will it drain the battery?
REPLY
If they are both 25W then no. Also, the battery does not matter once the bike is running. The alternator will provide the power. So it would be more of a question of whether your alternator can handle it. But if the original light and new light are the same wattage then it will be fine.
Could you please go into whether or not 2 batteries for say a 200 watt system could be an advantage.
Are you talking about 2 batteries versus 1 battery of the same capacity? Generally that means you are comparing two 6V batteries connected in series vs a single 12V battery. It depends on the quality of the batteries. Generally, a 6V battery will be either a golf cart or industrial battery which are very durable and higher quality than a typical 12V deep cycle battery. Now there are obviously 12V deep cycle batteries that are high quality from Trojan or Rolls or other companies. But when most people think 12V they think of a marine or RV battery. So in that case the two 6V batteries would be much better than a single 12V battery.
Thanks for confusing me more than ever
Confused.. need a way to check how much amp left in mobility scooter .I use 2 12v50ah batteries ..also do the batteries need to be fully charged after been riding....hope that makes sense ..
There are aftermarket "meters" that you can wire up to the battery bank but they are only approximations. If they are lead acid batteries then you definitely need to fully charge them before using the scooter again. If they are lithium then it doesn't matter much.
Hello. I have a question that needs a good clear answer.
My intention: To busk with my bass amp using a battery.
Ok so my bass amp is : 100 watt max output. 310 Watt power consumption
I have a 500 watt (1000 peak) invertor (modified wave). I read on 2 sites that its a god idea for to besafe, use a wattage 10-15 pcent on top of the power consumption value. (mine being 310 watts)
I wont be cranking the amp up loud as it produces some lovely low end sounds.
So..... For the battery, im aware of deep cycle bateries are more energy efficient (i dont mind charging it up eith my 12v charger when needed).
There is a guy called DUB FX on youtube and he walks you through his setup.
His setup is a 200 watt roland speaker combo amp. HE USES AN 800 WATT MODIFIED sine wave inverter and a 66ah 12v gel battery.
My amp is half the wattage as his.
Which battery would suit me for 3 hours of play time?
Weight isnt too much of a problem .
Thanks in advance folks of voltagery wattagery wizdom
I am running a 7 watt light outside the tool shed, 9.5 watts on the porch, and 9.5 watts on a small indoor lamp. All with a 100 amp hour battery. How many hours can I run all three?
Not enough information. A good guesstimate would be about 4 hours if you use all 100Ah. But more likely after you subtract some real world losses and conditions I would say 3 hours is safer.
It's a lot easier to understand the capacity of a battery by converting the rating to watts.
Amps 225 x volts 12 = 2700 watts
So if you have an electrical device that draws 100 watts, you can theoretically run it for 27 hours.
But if you don't want to destroy your battery, you'll won't run it past 50 percent discharge.
So you really don't want to run a 100 watt device for much more than 13.5 hours.
Or a 50 watt device for 27 hours. Or a 25 watt device for more than 54 hours.
Or a 12.5 watt device for more than 108 hours. Or a 6.25 watt device for 216 hours.
The past 50 percent discharge is only valid for lead acid batteries, lithium can go as low as 10%.
in comparison with cca at 1,000cca's, to amps times volts to get watts, 1,000cca times 12v would be 12,000watts, would that be correct? in series that's a lot of wattage
could use the similar bms as the lithiums
What happens if you run your batter when its low? Does that shorten its lifespan
@@tommy3763 capacitors could handle a quick charge for extra charge for the ledacid after shutdown
I have 12 v car battery can i hook up in lead-acid battery and charge theme both
I'm not understanding your question. A car battery is a lead acid battery. Do you mean a deep cycle battery?
If i have a component requiring 36ah battery how many ah battery do i need to keep the component running for 10 hours.
What is the component and how many Watts does it consume? There isn't enough info to solve your equation.
Hi. I bought two 12v26ah10 hour batteries by mistake for my mobility scooter & I just noticed the ones that were in it are 12v26ah 20 hour batteries. *Will the 10 hour batteries I just bought WORK in my mobility scooter?*
If so, what changes can I expect?
Thanks.
They will work and they will actually last twice as long. The 20's you had in there previously are rated at a slower run rate (20 hours) so their capacity (26Ah) is inflated compared to the 10's.
LDSreliance Thank you so much for your insight. This comes as good news the 10hr ones will last longer.
Will these 10s give superior performance?
I ask this because the scooter seemed to never be able to drive fast speed again after the 20s were installed. Always drove at lagged speed that felt like battery was about to die...as if it didn't charge, even tho it was keft to charge a long long time. ( for days)
Maybe with these new 10 hr ones, I can reach the original fast speed as it did when I 1st bought my scooter...before that guy installed the 20s.
It is possible. I don't have all the information on those batteries but they might provide a little better voltage at the same loads than the other batteries.
would this change if you had a super capacitor hooked in the circuit?
In a way it would add to the overall capacity of the system.
I need some help.
if something requires 13ah to run for 20 miles.
if I use 101 ah battery does that mean it should go 140 miles?
the battery required is a 24v 13 ah lithium battery, I'm going to be using two 12v 101 ah lead acid. if I remember correct up the volts amp remains same. so should be 24v 101ah. right?
for those wondering why I dont just go lithium.
1st. will be charging with 24v solor panel.(250w). the batteries are made for 110v charge.
2nd lead acid a lot easier to get for me.
3rd. looks like a silver lining to my charging situation is I get much more battery. ( can only charge with the 24v solor panels)
Can you tell me what amp hours would be recommended for 4 twelve volt batteries for a 48v 1000 watt ebike converter wheel?
Not enough information. This would be a complicated equation even if I were confident enough in the math. But you would at least need to know the relationship between weight of bike and gearing and energy consumption. And then you would need to know how many miles you want to go on a single charge.
@@LDSreliance ok it calls for 17ah or higher! To work
I don't know enough about ebikes but 17Ah would not go very far with a 1000W motor. I would say minimum 40Ah.
Thank you
You are welcome. Thanks for watching!
I want to go camping and set up a portable power. I'm planning to use 1,000W electric single burner 1 hour a day. I have a 12V, 30 Ah lithum battery and a 100 W solar panel. I calculate 30Ah/20hrs=1.5A, 1,000W=12V x 83A. How to calculate how many minutes can I use from my 30 Ah lithum battery? Thanks for sharing!
Unfortunately, Peukert's Law states that as you increase the current draw on a battery, the capacity drops. And it isn't really linear so it makes it hard to estimate. But with the limited info you provided, that small of a battery cannot provide that much current without heating up to dangerous levels within 30 seconds. For example, the lithium iron phosphate battery I showed in a recent video (ua-cam.com/video/UBjR0IH4450/v-deo.html) which is only slightly smaller than yours can only provide 50 amps for less than 30 seconds. After that it is dangerous.
I know that doesn't answer your question directly but you will need a bigger battery or three to run that load for any meangingful amount of time.
what battery capacity i need in 30watts led light with 140watts solar panel? thanks
Not enough information.
So if I increase the voltage of a battery the capacity would decrease witch means the battery would take less time to run out??
No because the amp draw on the battery will be less. It will actually run longer due to Peukert's Law. In other words, a 12V battery with 100Ah is equivalent to a 24V battery with 50Ah. Now let's say you want to use a 500W load off of your batteries. If you run that load on your 12V battery it will consume 41.67A. If you run that load on your 24V battery it will consume 20.83A. The 24V battery will be able to run that load longer because Peukert's Law states the higher the current draw the lower the capacity of the battery. Does that make sense?
I have a unit that pulls 19.5 amps. Could you please recommend a 12v battery to power it for at least 3 hours? I'd really appreciate it.
I suggest you use 1 unit 12V battery of 120 Amp Hour Battery capacity. That is using only 50% of total battery capacity and with the condition that you are only using a resistive load. But,ed if you are using conductive load, I am suggesting you to use 200 AH Deep Cycle battery for you to be able to start up the current need by inductive loads.
You explained it pretty good ,but not fully. I am trying to understand batteries. For example , I buy a small 9 volt battery to operate a small item at home, now compare to a 18 volt battery for a drill, compare that to a 12 volt battery for a car. I take it the term volt doesn't mean Any thing??
I have some videos explaining volts and amps and some of those concepts for beginners. It might help you understand the basics a bit better: ua-cam.com/play/PLbKwoGlXEWapfh6AwV1F3FdOIb3hlGcYh.html
💥💥💥QUESTION 🙋♀️ what is the best way to maintain my 12Volt 35AMp how often should it be charge I guess the obvious thing to do would watch the voltage and when it gets I don’t know below 13 give it a charge that’s what I’m thinking is that correct thank you
Depends on what kind of battery it is. Lead acid? Lithium? Also, what are you charging it with?
can I use a capacitor instead of a regular deep cycle battery
Theoretically, yes. But it depends on what you are using it for.
Thank you I just got a new head torch for sea fishing at night and wanted the answer
🤔🤔Can I upgrade my Ah from 4000AH to 6000AH plus at the same 3.7volts YES! YES YES THANKS MAN 😁😁😁😁😁😁😁😁😁😁😁
Hi my current battery is12v 6ah 10hr can i replace bettery with 12v 10ah or higher number on ah and hr. Which means i want to replace with 12v with bigger capacity battery. Pls advise me thank you
Yes you can always replace an existing battery with one of the same voltage with slightly higher capacity. Just don't go too high or the charger may not be able to handle charging the new battery up fully. And sometimes there is a size constraint or a special connector required so make sure it will fit.
@@LDSreliance Thank youi very much for the feed back god bless you.
You are welcome. Good luck!
hey, I have a question about ah.
I have a ice shaver that's 6amps.
and I'm looking a dep cell battery that says 105ah.
and I'm going to plug in my 110volts shaver to my 100 watts inverter box how long a day can I run my shaver.
it's 105ah rated on 20 hrs.
Thanks for your help Willie
1600 watt inverter box I mean sorry
You should be able to run it for a little over an hour. That ice shaver consumes 600+ Watts if it uses 6 amps @ 110V. So that will really tax a deep cycle battery like yours because they aren't designed to run high loads (at least not a standalone battery).
LDSreliance
how can I set it up with a deep cell battery to run it for a least 8hrs a day. to plug in to make inverter box it's 1600 watts .
want to get away from the generator
Thank you for your help.
Willie, I would get a Kill A Watt meter and test exactly how many kWh that ice shaver uses during your 8 hour day. I bet you that it does not use 600 watts the whole time. If you don't have that meter, it is really cheap and a great investment to check the usage of many different appliances and loads. It is under $20 with free shipping and will save you a bunch on your solar system: amzn.to/2rQ2bth
Anyways, if you don't want to check the actual usage and we have to assume it uses 600W all day then you would need around 2250 Watts of solar panels and at least 225 Ah of battery capacity. That is assuming 4.5 sun hours per day (since I don't know where you live) and no battery storage for rainy or overcast days. If this is in the summer and this is a shaved ice stand and you are only open for business when it is hot and sunny then you could do it with about 900 Watts of solar panels and your existing 105 Ah battery for buffering the startup of the motor.
LDSreliance
can I also get to batteries 225ah and hook them together to get 450ah that way too.
I order a genuis battery charge too.
can 2 batteries be charge at on time.
I don't want to deal with any solar panels and generators.
.
Thanks again for all your help.
How high should I charge my battery to store I have a 12 volt 35AMp
Thunderbolt
Responded to your other comment.
But you cannot run a lead acid battery to less than 60% or it will damage it
200AH 12V battery in series parrellel connection charged accross 24 v supply
What is the total AH capacity in this case .
Is it 800AH or just 400AH .
Please answer sir
When you connect your batteries in Series your voltages doubles but your capacity stays the same. So your series connected 2*12V = 24V with 200AH. In order to have a higher capacity you need to double your batteries. So 2 in series and 2 in parallel. That will make your total 24V with 400AH. Hope this answers your question.
I wish you explained some more. thanks though
What else did you want me to go over more?
I have a escooter abd i just replaced my batteries, 5x 12v 25 ah. But it seems my charger , that i also used for my 20 ah batteries cant charge them fully, and tgey also dont last as long as when i received the batteries full charged. Now im googling about it and some say i need a 25 or 30ah charger and others say i need a charger that charges with 10% of the total needed ah value. Not planning to buy new batteries every 6 months and restricted to ride only small distances . Will give ot one more try, but else i think i can say that the philippines is not ready yet f9r ebikes if cant provide correct info and equipment
Hi, Is there a way to test a battery to find out the amount of amp? How do I know that the battery is 100amp or 300 amp? Do the listed amp matches the actual amp? Thanks
Without a battery tester there isn't really a way to find out how many amp hours of capacity a battery has unless you get that info from the manufacturer. I assume it isn't listed on the battery label or the label is missing. Is there any other part number or identifying info on the battery?
@@LDSreliance what battery tester would you recommend? As i searched here, the only video I found helpful was a car battery hooked up and when the car starts it draws power and then you can measure the current draw. The multimeter l found for that, one is from Ames and another from fluke. My delema is that i am not hooking up the lifepo4 battery yet. I just want to know which meter should I buy to check battery amperage with out hooking up to a load. I am very new in learning electronics, so just collecting items before the installation. If you can make a video that would be great. Thanks
@@LDSreliance i am planning to buy the meter but it won't solve my issue. As i am not trying to just determine the load the specific fan or light i will hook it up too. I am hoping the battery have the amp it says. Its better that i know how to check it. Thanks
You can't test the battery capacity without hooking it up to a load. Basically, you need a battery tester that can measure the amps and keep track of how much energy is consumed on a given load. Then you can do the math for how long you ran the load multiplied by the current that was consumed.
Basically battery capacity doesn't tell anything about the ampere in circuit..Ampere in circuit just depends upon wire resistance and load applied..Am I right please reply soon???
You are correct. There is a limit to how many amps the battery can supply and then it is further limited by the wire size and resistance.
Thanks for broadcast! In your opinion do you think it's possible to build tool box solar systems to run a Mr heater or charge tool batteries or a small frig of air conditioner? If you had saw 3 or for of them with a regulated electronics on it so it doesn't over charge I'm a beginner but see we may need this sooner then we think!
i just UNDERSTOOD this is complicated lol... i run a small "fridge" in my van that uses about 1-2 amps per hr if i am remembering correctly what that man said. i have a 30 ah agm battery and i can run my fridge for 2 days straight on a fully charged battery. Then i get home and that thing is depleted THATS ALL I KNOW.
Wow awesome explanation
Thanks, I appreciate that. I am glad you found it helpful.
Amps, is different than amp hr. Do the calculation . Also how many amp draw , of the product you are trying to power
What if it doesn’t say @ what hours?
I want to figure out how many Ah the battery is that in trying to buy... But it's only written in 20hr amp rate.. so how do I convert it so I know the full capacity.
It says
69 (20hr rate-Ah)
63 (10hr rate-Ah)
There is no standard hour rate for battery capacity, but 20hr is probably the most common. So you have the capacity there in two different ratings. The second number is lower because of the Peukert Effect (higher the load the lower the capacity).
@@LDSreliance I'm basically asking what capacity the battery is as I don't understand this hourly thing...
The other batteries in getting are 100Ah and wanted to know if this was the same, higher, or lower
Not enough information. Those other batteries are rated at 100Ah but are not supplying you with the hourly rate. That is probably because most people don't understand that part. So if you dug up the detailed specs from the manufacturer you would see the hour rate that the 100Ah corresponds to and then you would be able to accurately compare those batteries with the one you are trying to buy.
Sorry, but I don't get this, I don't think you provided any explanation at all as to what an amp hour is. An amp for one hour straight, right, i get that, but at what voltage, or what's the load impedance or the power in watts? Why arent batteries simply rated in watt hours? Can someone please tell me what an amp hour actually really is?
For example, according to Ohms law (V=I*R), if you take a standard 1.5V AA battery, you would need to put a 1.5 Ohm load resistance across the battery +- terminals to draw 1 amp. Drawing 1 amp from a 1.5V voltage supply for 1 hour through a 1.5 ohm load resistance is the equivalent V*I=1.5*1=1.5 watt hour. But if you take a standard 12V car battery, you would need to connect a 12 ohm load resistance to draw 1 amp. Drawing 1 amp from a 12V voltage supply burns 12 watts and doing it for one hour is the equivalent of 12 watt hours, more than 8 times as much power as with the 1.5V AA battery example.
Surely the true definition of an amp hour refers to some fixed measurement of power, and not just some vague varying definition depending on voltage supply? So what gives?? What the actual f'''' is an amp hour?
Don't get fixated on voltage. It is as simple as a quantity of energy in a battery that allows one amp to flow for one hour. That rate changes based upon the amps drawn. A higher load will draw more amps and capacity will diminish at a more rapid rate. Capacity drain is not constant. According to Peukert's Law, the faster the drain, the lower the actual capacity is. That is why this is so hard for people to understand. It is not linear.
"Don't get fixated on voltage."
But if i don't know the voltage, then i don't know the power. If i don't know the power, then i don't know how much effect a battery would actually give me. Saying that it is as simple as a quantity of energy that allows one amp to flow for one hour is insufficient information, because 1 amp driven by a 12 volt battery has a lot more energy and power, 8 times more energy to be exact than 1 amp driven by a 1.5 volt power supply. So are you saying that an amp hour for a 12 volt battery is 8 times as much as an amp hour for a 1.5V battery? That makes no sense that an amp hour would not be a fixed quantity of measurement.
Battery capacity has nothing to do with that, though. You can have a 10 Ah battery that is 6V and a 10 Ah battery that is 12V. They both have the same capacity. Obviously one of them will be able to provide that capacity at a higher voltage and thus a higher wattage, but the capacity is the same.
So if i put 2 of those 6V 10 Ah batteries in series, do i end up with the equivalent of 12V and 20 Ah or 12V and 10 Ah?
12V 10 Ah. Series doubles voltage. Parallel doubles capacity.
Someone, please help if you may... I have 2x 12V batteries in parallel. they are lead acid. it sais they have 105 Amps at 20 hrs/each. So in parallel does that mean i have 210 Amp hours at 20 hours? I have 100W light bulb, but if i run it off my 700w inverter, with these batteries, i only get 2.5 hrs of run time, as i dont want to go below 12.1V....i turn it off to save the batteries life. Why am i getting only 2.5 hrs of run time? Please help...thanks.
Yes, in parallel that means you have 210A. But keep in mind that lead acid batteries should not be discharged beyond 50% SoC. So in reality you still only have 105Ah as both batteries only contain 52.5Ah.
Not every battery has an Amp Hour listed on the battery. How can I know the Ah of a battery if it's not lt listed?
There is a good chance it isn't a deep cycle battery if it doesn't have that rating. The only other way to find the rating is to contact the manufacturer. Perhaps they have a product page on their website with more detailed specs. Or a customer service contact that could answer it for you.
hey,
I'm kinda confused I done the math like on your video my battery is 105ah at 20hr. rate.
I took 105÷20=5.25 amps a hr. right.
so if I'm converting my 110volts to 12volts with my inverter box.
what it last more than 1hr.
Thanks I just need a little more help.
Thanks again for your help.
Yes and no. Your battery will discharge for 20 hours at 5.25 Amps that is correct. But if you go up to 50 Amps, it will discharge much faster. It is not linear. There is a phenomenon called Peukerts Law that states that the capacity of the battery actually decreases as the discharge rate increases. So your battery may have 105Ah @ 5.25A but will only have about 60-70 Ah @ 50A.
LDSreliance
so deepcell do I need for that to run a 8hr. day if you know of one I need can you send me the link and what I need.
Thanks again.
I was using 3 ampere hour battery in my bike so currently can I use 4 ampere hour battery instead of 3 ampere hour in my bike or not
Yes. You can always use a higher capacity battery, as long as it will physically fit or attach. The only thing you can't change is the voltage.
@@LDSreliance is it safe for engine if I use big capacity battery... I mean will it damage the electrical parts or not....?????
No. Think of it like a 12oz can of soda vs a 20oz bottle of soda. You drink them both the same way and at the same speed. But you can drink longer out of the 20oz bottle because it holds more liquid. Same thing with different capacity batteries. Your 3Ah battery will provide the same voltage as the 4Ah battery to your bike but it will run out of energy sooner. That's all.
Brilliant
Thanks!
so run rate is the amp draw?? thank you
The run rate is 0.05C and the duration is 20 hours. 1C is the theoretical rate at which a battery would discharge in 1 hour based on the capacity. So if a battery is rated at 70Ah, then C=70A. So the 20 hour rate would then be 3.5A for 20 hours. Does that make more sense?
I have 24v 7 amp battery for power wheels can I replace it for 24v 12 amp?
Yes, as long as it fits! It will last longer.
LDSreliance thank you
LDSreliance it has 2x12v can I replace them with 2x24v?
Hi, I have one question...why 24v solar panel not connect to 12v battery?
Some charge controllers can handle the transition but you are wasting energy converting like that. If you have a 12V battery bank then you should wire your solar panels to be 12V as well. Same with 24V.
@@LDSreliance Thanks..suppose if I use 24v solar to 12v battery without using any controller...then can I use 24v panel to 12v battery.? If not means what is reasons behind this?
@@mshanmugapriyan No, you can't do anything without a controller.
I have 4 of the 210 AH AGM batteries running a night light 8 hours a night. The LED night light draws 500 milliamps. I recharge the battery bank when it gets to 11.0 volts.
Do you think the County Fkn Tax Assessor will add another $1000 again to my bill before I have to recharge? Its in Sonoma, Calif. Thank you for your posts. They are very handy.
PS:The County says they are ''voter approved bonds...'' so they can jam them where the sun don't shine.
Man, I have no idea about that. Do they seriously do that?
Oh, boy. I guess I shouldn't drink and post.....
I enjoy your videos! Keep up the good work!
Haha, you are welcome. Thanks for watching!
can i use a 10ah battery insted of a 5ah battery? on a motorcycle same voltage of 12v many thanks
Roger, yes. The voltage is the only thing that matters in this case. Of course its wise to make sure you keep the proper fuse in the circuit to protect the system if something shorts out somewhere on the bike.
We were stuck in some backwoods place (Deliverance comes to mind...) while touring on Honda CBX 6 cylinder bikes. My buddy's battery failed completely at a little store in the woods. We bought some guy's old 12 volt 800 amp trolling motor battery and strapped it to the bike's seat with rope, ran some scrap Romex house wiring to the original battery box leads. We push started the bike (The 14 gage Romex would fry instantly if he hit the start button) and finished the 150 mile leg to a city where we could buy the proper battery. They exchanged the Yuasa bike battery for free as it was on the recall list.
That last line is where I need help: "the more battery power you draw, the faster you discharge the battery."
🤔 Assuming I am to draw much power out in a few minutes if I have a system to recharge the battery, what must I provide in this system to ensure it recharges the battery adequately and time commensurately (what amout of energy or what component??)
The charging current of a lead acid battery is limited by the internal resistance, which is pretty high. So usually lead acid chargers like you see for car batteries are 1-10A for the most part. It really isn't possible to rapid charge a lead acid battery.
If you are talking about a lithium battery that is a bit of a different story.
@@LDSreliance Hey I am reading the comments and looking at your replies and looking for things that draw my interest. I have a question also and it is kinda similar to the one above. So if lead acid batteries don't like to be rapid charged it makes me wonder what about if say you have them pretty well charged at 12.6 volts and the charger isn't pushing much into them. Then you put a high drain or load on them like an a/c which I am going to guess around 15 amps or say a microwave taking 1500watts (11 amps?) and then start pumping that current into them at the same time. So I guees its like massive discharge while massive charging.
Another question and I understand that mybquestions are long and getting to be longer. I can probably try to watch more videos but thought to ask. Umm so most chargers detect the resistance in a battery so say you had a 40 amp charger that can charge at 40 amp hours and you ran 10 amp hours out of a battery bank what's stopping the charger from trying to dump 40 amps into it or if your battery bank is to small and you try to have lots of energy pumping into them?
I guess I could say what I'm am thinking about for charging is solar. Say you have plenty of solar power for your batteries and want to know if you can charge and discharge close to the same rate if the battery is already charged and just having a lot of heat going thru them? Also I would have battery temp sensors if that could help.
I'm considering a second battery for my car that will run multi-cameras, countermeasure gear, SSD storage drive, and an AC powered speaker. While I know, I will need an inverter, but I can't tell heads or tails of the amp rating of the BU switched isolated battery I'm considering. Here is an example: There are various references to amps, but I have no idea which one indicates the 'basic' amp rating. Open Circuit Voltage - 13.3V Max Charge Voltage - 15.0V Recommended Charge Voltage - 14.5V Minimum Voltage - 8.0V Max Discharge Current - 2,400A Continuous Discharge Current - 1,080A Max Charge Current - 540A RC - 124 minutes @25A Watt-hours - 675. Most of the values seem rather high, so I'm guessing RC-25 (Run Continuous) amps?
That is a very interesting battery. Do you have a link to it?
Sure thing'...4xspower.com/shop/lithium/ultra-safe-technology-lithium/xs30k/
Just let me know your take on the amps of this battery. Also, I would like your feedback on using a single 30k or two of the 15k. I want to use an A/B switch if I need to change over as an alternate start battery; but primarily, the bank would be to drive a 4~8 channel dash cam array w/IR connected to an SSD storage; while I'm away from the vehicle when shopping, etc. CTR~
Daniel, that is a very interesting battery. I am highly, highly skeptical of the specs, though. 675 Watt hours is only about 56Ah. A comparable 65Ah lithium iron phosphate battery that I carry from Miller Tech only costs $580 and can handle a maximum of 200A. Your battery claims it can provide 30,000W (2,500A) burst and 15,000W continuous (1,250A). That is not only incredible but very dangerous. That much current would require incredibly large cables and great attention to safety as it could instantly start a fire or electrocute you. If these claims are true, it is constructed as a starter type battery and would not be appropriate for deep cycle use as it would not last long.
If you are interested I can help you find a battery that would work. Just shoot me an email at ldsreliance@gmail.com.
Another concern I have is that battery is only warrantied for 1 year. Reputable lithium batteries should be at least 5 years, IMO.
May you have a recommendation on some other Lithium Battery offering?
Thing is things you buy say what watts they use unless there's packaging different for different people
What is 11.25 amp hours supposed to say if everything is in watt usage on power consumption?
What don't they just measure electric energy the same so that regular folk have some idea?
Perfect
So does this mean the battery will produce 11.5 amps per hour or per second .
Amp hours is a measure of capacity, not output. You can usually find manufacturer specs for peak current draw.
50vdc 42Ah (2.2kw) lithium ion battery. runs 50v 3kw BLDC motor how does it work?
Huh?
LDSreliance please explain how does it work
How does a battery power a motor? I am not sure what you are asking.
What is 12 volts at 20amp hours. Equal in amps?
Depends on the discharge rate.
Wow super informative a lot better than most UA-cam videos!
Thanks! I appreciate that. I have lots more videos where that came from.
How is it informative? The dude just regurgitated some information. I'm still clueless and going to search for more videos.
then it appears that you don't know what you are looking for.
That is actually the definition of informative.
[in-fawr-muh-tiv] adjective 1. giving information; instructive
How long will a 50 watt bulb runs on a 240 amp battery when fully charged
It will run for approximately 30 hours with a 12V lead acid deep cycle battery that is rated at 240Ah @ 20hr rate.
LDSreliance
How did you calculate?
Can we say a 1000mAH battery equals a 1AH Battery? Or mAH and AH are different.
Yes, that is correct. mAh is one thousandth of Ah.
i have a battery rated 14AH then beside ir written 20H. is it mean that the battery can give 14Amps for one hour or 0.7Amps only(14/20)?
BRO WILL U TELL 12V DC 9AH BATTERY MAH ??
im bad at math so plz help me out.....i have a car amplifier that puts out a continuous 2200 watts at 14.5 volts and my alternator is rated at 135 amps..how many amp hours do i need to run it for at least 2 hrs max?
You would need batteries totaling 1430 amp hours to run that amp at full power for 2 hours. Your alternator doesn't factor into the math unless your car will be running during those 2 hours.
LDSreliance yes the car will be running at all times....damn i bit off more than i could chew 😏
Well then if your car is running and the alternator can produce 135 amps then you only need about 50 more amps for 2 hours or 388 amp hours of batteries. That is a LOT more doable!
2.2 kW in your car?
1. You need to stfu and give other people a chance.
2. You need hearing aids because you are deaf. I SAID, YOU ARE DEAF!
3. You need to start learning sign language.
Someone let me know please.. does it mean that 5 amp can draw 5 amp in 1 hour or 5 hour I'm confused lol I'm noob at this
I have 12v 5amp power supply so I just wanna know
A power supply is completely different than a battery. Don't confuse amps with amp hours, they are different measurements for different things.
@@LDSreliance ah I see but thanks for the response
@@macksuting6263 No problem. If you have more questions let me know.
and you forget to mention that the standards for lead acid batteries say that the capacity is measured untill the battery reach 10.8V, but if you are using it under 12v will sulfatate and destroy herself much quicker... so if you discharge it untill 12v you will have much less capacity....
Yes of course why couldn't I think of that
How many watts can come out of a 6volt battery?
Depends on the battery. There are some pretty huge 6V batteries for industrial applications.
but is ther a tool that measures ah?
Some very expensive electronic tools, yes. Nothing handheld or affordable for you and I. You have to do it the old fashioned way and put a load on the battery and use a stopwatch to see how long it will power that load. Then do the math.
Hey Man, how many hours can a car battery power a motor by itself?
How many hours before it is dead?
Not very long. They are meant to provide a high amount of power for a short time, not a small amount of power for a long time.
Okay, Thank you. This was an awesome video.
What's the difference between volts and ah? Why do android phone batteries have an ah capacity while a dry cell have volts? Please enlighten me, I'll appreciate it.
Those are two different measurements. All batteries have both ratings. The manufacturer may not put that information on the battery, though.
What Im interested i n knowing is if i can use a discard car battery for small electric jobs such as emergency emergency spot light, outside security lights etc etc
Why do I get the feeling that the battery has SO much capacity (even one not suitable for starting a car) as soon i connect a wire to it , the wire will glow red hot ..... also any thing connected to it?
Where am going wrong here?
For an emergency, yes. For daily use no.
Current will not flow through your wire unless there is a load on the other end of the wire. So if you short circuit the wire (touch the positive and negative together) the electricity will flow OR if you have something connected to the wire that wants to consume electricity. But only enough electricity will flow for the device's needs. The battery will not push more power through the wire than the device is asking for.
@@LDSreliance interesting. So there would be nothing to stop me rigging a side lamp bulb up to a fully charged car battery using 2 foot of 5 amp (automotive)wire. The wire would not get hot?
Nope. The bulb would pull just the amount of current it needed. And unless it exceeded the amp rating of the wire you have nothing to worry about.
@@LDSreliance Thank you.
"The battery will not push more power through the wire than the device is asking for".
That's worth knowing.
Why do you say it's not for daily use? The fact a car battery looks unsightly or other reason?
Once again thanks for debunking a (life-long) personal logic- block.
Car batteries are designed to provide a high amount of amps for a short amount of time to start a car. They cannot be deep cycled (drained more than 10% of their capacity) without doing permanent damage to the battery. That is why if you leave your dome light on in your car overnight the battery is dead in the morning and may or may not be able to be revived, depending on its age and condition.