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How To Size Your Off Grid Battery Bank Capacity For Solar - Math Warning!
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- Опубліковано 1 сер 2024
- Properly sizing a battery bank is like black magic. Very few people really understand how to do the math.
So how do I know how many batteries I need? There is a lot that goes into that so this video starts to answer that question with the first step: calculating the total capacity of the battery bank you will need.
In the future, we will get into choosing from different types of batteries to Tesla Powerwalls to how to get the most longevity out of your system. Stay tuned for that!
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You omitted the really important things like a water heater, furnace, air conditioner and coffee maker!
and even more important cfl, bulbs, leds, tubes for light purpose and fan, cooler when ac is not required,
I don't think you'll need a water heater or an air conditioner in a yurt! 😬
Wifi to watch that tv too lol
@@girldirectorTV If you are willing to live in a yurt, you don’t even need electricity. 😁
just get the amp hrs he missed and add it to 1543wh he gave as example if you want the actual. You may also add ambient temp the may affect the battery performance. Just a suggestion.
Making use of the ua-cam.com/users/postUgkxcJ22tnHH9l1vjdIdEIG27iOG55P7LXI8 reconditioning plan, I just saved 2 auto batteries from being completely junked. The guides were very simple to follow. I wish I would have found this years ago! You may use the guide to recondition any battery type
Safe in terms of what?
Best off grid information vid on UA-cam! Very informative and practical! Must watch before attempting off grid set up!
Amazingly informative, a little over my head at this particular moment though.
That was excellent. I hadn't thought about the NOT discharging batteries lower than 50% capacity and how that safety margin means DOUBLING your estimated needs. Great job, thanks!
I just watched your video...very good. I have a hunting cabin that I use 45 days a year. I currently have a 100 watt panel with two golf cart batteries that supports two lights, phone charging, oscillating fan and a vacuum cleaner occasionally. After watching your video it looks like I can set up my system to maybe support a single cup coffee maker and a small fridge that I would use only while at the cabin. It's all about the amp hours of the batteries!! I'm learning.
Absolutely! That is the whole point of my channel so I am glad to hear that. The fridge will be the biggest challenge since it will kick on and off all day and night. Those kind of loads are hard on solar since you will only be producing power during the peak sun hours each day. So you have to produce enough excess power during those 3-8 hours (depending on the season and location) to last you through the night until the next day. And if the next day is cloudy... you are out of luck.
It is going to be hard to get by with just a single 100W panel. I'd recommend getting another one if budget and charge controller capacity will allow it. They are down to about $80 with free shipping on Amazon these days: amzn.to/35zTh9y
A 12v Automotive coffee maker(200watts)..25 minutes to make 1 giant cup of coffee. Dont leave home without it :)
Thank you 100x over! This video has helped a ton and now I can figure out what we need for our skoolie conversion.
Nice. I am glad it helped!
first pic reminded me of all the jars in an Egyptian dig. They were trying to claim it was wine! Same old. Good video! thanks.
Awesome video! Short and packed with the information that I needed to know.
I've been searching online and I'm sure they're out there but the information about amp hrs seems to be overlooked by a lot of people. I gotta give you credit for how you approached your video, simple and directly to the need-to-know info.
Thanks, I really appreciate that comment. So glad you found it useful!
Perfect for anyone. Beginner or expert. Would help anyone for their solar panel planning. 😃
That was my hope. Thanks for watching and for your support.
Great explanation, I’ve been trying to find a real world explanation for this, thanks for your help.
You are welcome. Thanks for watching!
Dude I am soooo glad I found this it helped me I am adding it to my watch later list so I keep thanks a lots got what I been looking for
You are welcome! I am glad it helped you. Thanks for watching.
Very good. I learned a lot. Thank you, alicia
You are welcome. Thanks for watching!
First of all, thanks for the video. I have been trying to figure out of how to size the batteries for solar system but there is no one who has explained like you do. I have already calculated my power demand for a tiny house in India and it is exactly as you have done. Thank you so much.
You are welcome! Always glad to hear someone found the information useful. Thanks for watching and commenting!
Nice job on the video! Can't wait to watch the next.Makes solar easier to understand.
Good, then I achieved my goal. What else would you like to see explained?
LDSreliance Could you explain the advantage of lithium vs lead acid?
Yes, I will add that to the list.
Awesome video. Thanks for the calculations. That really helps.
You are welcome. Thanks for watching! Be sure to give it a thumbs up.
LDS, enjoy your videos and wanted to mention something I just learned and many do not take into account. You did a GREAT job with the "gotcha" on not taking Lead Acid down below 50% DOD...so you need twice as much battery capacity. However, in reality, the customer needs MORE. Cause Lead-Acid/AGM battery charging scheme is 3-stage (Bulk, Absorption & Float). You can charge pretty quickly from 50% - about 85%, but then the charger has to click over to absorption and now it is VERY slow. So much, especially when dealing with solar (on average you can only count from about 5-6 hours for you sunlight calculation)....most Lead acid-AGM will only run 50%-85% (since absorption takes too long..most batteries won't get back to 100%. So you REALLY only get 35% of battery capacity at BEST !! :)
True. That also depends on the charge controller and how many amps you are feeding into the batteries. My existing bank right now does not stay in absorption very long at all. But I have an expensive MPPT controller and premium batteries. Your mileage may vary.
great presentation explained in an easy to understand format. thanks
You are welcome. Thanks for watching!
Good information.
Also we have to factor in the inefficiency of out Inverter. About a loss of 10% depending on what Inverter.
Add a further 10% to that final figure of batteries.
Explained it well, big thumbs up!
Thanks, I appreciate that!
Very informative video. Spending that much on batteries you definitely have to be careful with over discharging. Great work!
Thanks, I appreciate it!
@@LDSreliance Did Lithium slip your mind when you made this? It had been in wide use for some time, and has a 90+% DOD
@@tienouttatien8942 Not worth it unless you plan to cycle them daily for, literally, twenty years. Mostly it's useful for industry and sailors who care about weight more than money, not ordinary people.
Great info and welll made video!
Thanks, Austin! I appreciate that.
spot on info. excellent job. 👍
Thanks! I am glad you liked it.
Nice. To the point and accurate, everything here is correct.
Thanks! I appreciate that.
Good information as a primer. To muddy the water, consider the wattage of solar panels charging the battery bank. For solar panel power wattage only able to re-charge the batteries for the amount of energy used, this example is correct. In the real world, when you have way more solar than the energy you are using, (solar is cheap) you may go into each evening with a full battery charge each night. If this is the case, you only need a battery bank with enough amp hours to get you through the night. Also, solar panels make energy even with heavy cloud cover. Batteries are expensive. Solar panels are cheap. You do the math.
Maybe this video is more intended to a back-up power battery bank scenario instead of off-grid which need to take into account how the size of battery bank vs how much power you can generate and store back into the batteries using solar +/- generator over a longer period.
I just want to say a very sincere THANK YOU! All the videos I found before you were diy guys with background in electricity stuff, jumping back from solar panels to currents to wiring to frameworks to paid promotions and so on. You broke it all down like a man. So in short, going off grid is not as much a solar panel but a solar battery bank matter yes?
Yes, off grid requires, at minimum, a solar panel, a charge controller, and a battery. That would get you DC power. To add in AC power you would need an inverter.
That is very very good teaching sir!
Thanks, Johnny! I appreciate that.
Well explained..
Thanks
I'm amazed very informative...thnk u very much
You are welcome. Thanks for watching!
I hope you'll address alternate battery chemistries (Li-du-jour, Ni-Fe, etc) in a near-future vid
Excellent vid and a great size bite for beginners or those doing a system review/reboot/redesign
Yes, I plan to. I have reached out to a lithim battery company on the cutting edge of technology and they have agreed to send me some prismatic cells to play with. I also want to touch on 18650 cells, which is what are used in the Tesla Powerwall and other lithium ion packs. It may take me several weeks to do the research and get a hold of some products but it is definitely something I want to do.
i understand this great thanks
Hi... love your videos. Wanted help sizeing a small pv setup with battery for my intex pool. It has a 750w pump and a 125w clorene generator. Both have to run 8 hours a day. The only reason for the battery would be to guarantee a constant power supply to the chlorine generator or else it resets the programming.
Good this is correct colucltion.
Thank you for a very simple and coherent tutorial. Just leave out the part about ohms law which it isn't.
Great video! Had almost given up, until I found this. Thank you. Do you have any videos like this to help figure out how many panels I would need? If not, this was helpful enough. Thanks again.
Yes, number of panels is much easier. I did a video showing some tools to help you do the math: ua-cam.com/video/TO_a619bWh0/v-deo.html
Thanks for the video. So I calculated an off-grid emergency situation running the basics for my house, 20,000 daily watt hours. Calculate this through gives me 45 batteries (assuming 229 AH batteries and 50% discharge rate). $7,500! HOLY CRAP!
Yep. But if you get the right batteries they will last you 6-8 years (like my Trojan T-105RE's). Or, another option to consider, is go hybrid and install a small wind turbine. They can provide some power all day long unless it is less than about 7mph winds that day. That can help offset your electric needs, especially at night, and allow you to get by with a lot less batteries.
Bobos Curse, actually if you get crown's cr260 lead acid battery and use 48v system you only need 24 batteries. My local dealer has those batteries listed for $120 without a core.
@@rigginsranch Yes. But what's the DoD for them and do you have to constantly feed them water and keep them in cool areas like the forklift deep cycle gels?
could ya do another video....same stuff but a 24 volt system....then there is confusion with appliances using ac or ac and the best voltage
excellent break down with yurt....but a washer would be nice addition to the calculation.....
Great explanation
Thanks! I appreciate that. And thanks for watching.
Very informative information bro.
Glad you liked it. Thanks for watching!
thanks this helped alot
You are welcome! Thanks for watching.
Great explanation. I went w/ what I thought I could afford. So down the line I plan on expanding. I have done a lot of the worksheets for learning sake. It is probably further away than I would like due to cost and the fact my batteries are too old to really add to and way too new to trade out yet, so focus set on paying off what I have and saving for that big day.
Sometimes doing what you can afford is all you can do. You'll quickly find out what limitations you have with that, like you did. That is life, right?
:)
Hi there .really enjoy your videos. I have a question to which I am getting mixed answer. I have a small hunt camp. 14 x 24. I am setting up a small solar system. I have 3 100 watts 5.5 amp solar panels . The battery place told me I needed 4 6 volt batteries. It says 25a with 440 under. Then 20 hr with 220 under on the batteries. Do you think I have enough solar panels? After watching this video I calculated I need 500 amp hours. Any help would be appreciated. Thx
thanks bro for the informative video. can you please make one on how to size both batteries and solar pv for an inverter (s)
You can't make sutch a video ... Becaus .. of ... Where u live... Onley you know
Sun hours where you are .. so you can make a general painting All pink video..
Or you can add you watt Up.. ..
You max draw !! Dish Washer .. dryer .. wacum cleaner .. No On SERIUS has a 1000watt pure sinus inverter .. for house hold APPLIAENSES
Remember a microwave oven at 850watt microwave is 1800Watt AC most dishwashers are 2000watt or more
So.. to sum IT Up No On 12v .. onley 48v efeciancy Counts .. Wire gauge /mm² Counts ...
PV in series never ever paralell .. again Wire gauge/mm² over distance = loss ..
Paralell same A higher Volt Better effeciancy ... Dont buy the SHADDOWS on panel .. bla bla bla .. yes the one panel drops in volt ..
The rest don't and the small A IT can put out won't go to waste in series like IT would in paralell
it appears that the loads for lights, heating or cooling (fans, blowers, and compressors), water heating if electric / water pump if pressurized or for water transfer, any communications support equipment (internet for said computer) and any tools, portable battery's
that helped thanks
You are welcome. Thanks for watching!
Thanks for Share information⚡⚡👍👍
You are welcome. Thanks for watching!
Awesome
very good video
Thanks!
Would of really liked to see what a setup would look like at those specks
Did you account for size of the array? During the day you use power more so than night. The pannels are beeing used to supplement the battery charge cycle which reduce the amount of charge going to the batteries. It's a balance.
Hey everyone, i'm looking into to permanently running off of a combination of solar and power banks for a 50 amp RV. I have no experience of either of these but anything is possible with youtube right? Any info on how to go about calculating an overall AH for a 50 amp service would be awesome. Thanks!
Have not had time to read all the comments but this video is missing the voltage converter efficiency, which will increase the battery capacity required, but the battery capacity is specified for a particular discharge current, so if you are not exceeding this current you do not need to double the capacity as in the video.
Excellent video 👍
Can you please tell me how much watts does 2ton Ac uses if we run 18hrs per day.
It varies widely depending on your unit. There should be a spec panel on it that tells you all the information for your unit. It'll say watts voltage along with all the model number and serial number
Thanks for a great video. My problem is, if I take your example, a 700+Ah battery bank will weigh more than my van... And lithium is several years from being affordable. Made me reconsider my plans. Thanks.
True. If weight is a concern then lead acid batteries may not be feasible. Good luck with your plans!
I have just started trying to educate myself on this subject, and thought that 8Trojan 220ah batteries at $250 each would do it... as per LDSreliance kit seen here;
kit.com/LDSreliance/medium-size-solar-diy-kit-632-watts#order-2-of-these-2
3:14 If you are using an LED TV at 32 inches it only uses 28 Watts. For a 100 Watt situation using an LED TV it would need to be around a 68 inch. (not sure what type of TV was being used as an example in this video)
One thing Texas Power is a monitoring app that you can install that tells you exactly how m power you using every minute of every day as well as historical usage. Most states have this program.
Cool. I will have to look into that.
Also the shower and kettle very hard on power ,,,, very good clip.
Yes they are. Anything that heats or cools is usually very power hungry and requires a lot more solar.
Need to know how many batteries and type and the optimal voltage 12, 24, etc for this scenario.
Very informative video, but i might break your advice on going for less than 2 days for my purposes 😅😅 trying to build a battery system for my whole house to take advantage of off peak usage rates where I live... So it will be charged every night and only used for 16-18 hours a day
If you can afford it, go for it! It just gets real expensive real fast when you try to store multiple days worth of power.
I kill an estimated 500w in one hr (60in 4K tv ps4 pro and WiFi modem) I could be wrong but my plan is to build a 2kw battery from Nissan Leaf modules. I game for 2hrs so 1kw
Refrigerator does not work 24h per day because it has interupting function depending of temperature inside. If the temperature comes at selected level it stops and it starts again when it comes up and the champer get warmer...Any way thanks for the presentation....
This was a really helpful example, thank you. But can you also explain voltages? Like most components don’t run off 12v right? So you need some sort of equipment to step it up right, or just by a whole bunch of 12v stuff? Does that effect the power consumption?
You can get almost any appliance or device you need to work directly with 12V or 24V DC if you try hard enough. And if you can't then you can run it off AC power from an inverter. But obviously that wastes some energy. But to answer your question, yes you can get step up or step down transformers that will take the 12V DC (or 24V DC power) from your battery bank and convert it to power that your devices can use.
Relax, I am pretty sure he was concentrating in demonstrating on how to estimate the size of your battery bank. If he were to continue explaining the rest of his set up, he would be talking about the charge controller and inverter and several other small components needed in the system.
Hi
Thanks for the information. Very interesting. I have an incubator of 170w , 230v , 50Hz. I want to use it for 28 days consecutively. Please can you calculate for me the solar panels, the batteries and controller should I use?
I need your help please.
Where do you live? This would run around the clock? That will be a very big solar panel system.
So when you make these... you get to a point where your solar panel load is maxed on the charge controller that they go into. Example, 300 watt solar panel goes into a charge controller that is also maxed at 300 or 350 watts.
What I'm wondering is... because you've already invested in that set up and that battery bank can you just have another set of panels also around the similar amount of the previous charge controller going into a second charge controller, and having that connect to the solar bank somewhere? Or something similar?
It doesn't seem feasible to just get rid of the charge controller and start over because of its limits. I'm also a very limited budget. So I'm trying to find a way to SAFELY look for ways of loading in a second set of panels and where would be the safest place to connect them in a simple closed system? Thanks.
Also, one of my question is ... when you connect an incoming charge from the combo of panels and charge controller... is it safer to have the positive and negative connecting to the first battery together? OR to have them separated with the negative and positive connecting on different batteries?
What about if you're planning a 48v system, 20 solar panels (320w) each, wind turbine, (4)forklift batteries, 24v, 1600ah each for a yurt, I'd rather make too much power than NOT enough.
In many scenarios, you will need to change that 12v storage to 110v for your devices. Inverters run at less than 100% efficiency. In a future video, will you please expand the calculations to include inverter (lack of) efficiency? Thanks!
You mentioned once about (somewhere) running battery's in a series and parallel for more function or to get more storage power. could you explain that (in layman's terms)
Yes, watch this video and then ask any more questions you have at that point: ua-cam.com/video/4yxR-Iz2Xdc/v-deo.html
HAHA, that is a LOT of batteries! (at the beginning...)
The absolute best way to calculate the demand that you will need to supply for will be to purchase a metering device like a TED (or one of its competitors) that will monitor your whole house usage 24x7.
I own a TED, and it places current transformers in every breaker panel in my home as well as smaller CTs on key loads I really want to watch like HVAC,Etc. I also have a set of CTs on my PV panel as well as my Backup Generator Panel which account for their contribution as electrical sources.
TED will record and store up to two years of detailed usage data in a database which can be downloaded at any time and the data will be cross referenced with the date and temps/sun amounts on those days as TED tracks the local weather as well.
If you tell TED how much your electrical utility charges he will predict your bill.
All of this will allow you to very easily size a battery system knowing that you have confidence that you can life within the limits of the system.
Yes that is the best way. 99% of homeowners will never do anything close to that, unfortunately.
I been running solar at my current home for 8 years. First year i used some cheap wallmart deep cycle batteries. I saved up and bought some 2 volt 1200ah lead acid batteries from rolls. My system is a 24 volt system. I run 2 15cu ft chest freezers a refrigerator some computers routers fans ect... i calculated 5000 watt hours a day and its been mostly nice 10 months out of the year. I needed more solar panels for the winter. My panels put out 200 amps when the sun shines and my batteries were doing fine. They are getting old now and i really looked hard at the solutions for storage and settled on some chinese Ni Fe 1200ah cells. they should be getting here in 5 weeks ( a slow boat from china ). One thing people should know is that the edison battery has a higher charge requirement and can also be taken down to a deeper discharge with no ill effects. My system will charge to 34 volts and discharge to 20 volts. I use some Schneider inverters that can be programmed to deal with the higher/lower voltages required from Ni Fe batteries. The lead acid batteries were 350$ x 12 for a 24 volt system. The chinese batteries ( sticker shock ) 500$ x 20 for a 24 volt system. The huge difference is the lead acid batteries lasted 8 years. The chinese edison cells will last 60 years as long as you flush and change the electrolyte every 8 to 10 years. Who knows some edison cells are still working past 100 years of service. I looked into the power wall stuff and its great for grid tied systems but for off grid its not a good fit. It also would have required me to completely change out everything from charge controllers to inverters. IF you decide to go off grid do as i did all walls use R50 insulation. cute down heating and cooling. Yeah 100f outside but 75f inside oh yeah thats savings.
Very nice. I would have expected a lot more out of those Rolls batteries, though. I thought they were warrantied for longer than 8 years? My Trojans are warrantied for 8 years and they are not even a premium line of battery.
Please let me know how the NiFe batteries do for you. I am very interested.
Very useful vid, thanks for sure!! Will the next on this line of vids deal with needed size and number of cells/batterys?
I will see what I can do on a video like that. My video production schedule has been greatly decreased the last several months.
LDSreliance. Dontcha just love life sometimes?.....
Some things I've been looking for and havens found is, for example, the ratio of plate surface area to amount of charge and the amount of electrolyte to amount of current stored.
please try and do a video on that. thanks
David Dompreh I will do just that when I gain enough knowledge to do so
I would add the effeciency loss from all the system (especially the inverter), which can be sometime as low as 85% efficient, + wire loss etc, and i would add up the phantom drain of all the electronics, like the tv. Mine uses 124 watts when on, but 34 watts every hour when off (or standy)
To be most accurate that is right.
To be fair though, if you go solar you need to be buying the most efficient and low energy appliances. At least A++ fridge and freezer, LED downlighter lighting etc. Use a quality MPPT controller, and a good make inverter will be over 95% efficient. You pay for quality but this is one area that it pays off.
Great info. Now how do you equate that to the number of batteries needed? How many solar panels needed to maintain that?
Number of batteries needed should be straight forward after you have determined the load and capacity calculations in the video. Simply choose a battery you want to use and then divide the overall capacity required by the chosen battery's rated capacity and that will give you the number of batteries required (in parallel). I will say, though, that it is MUCH preferable to wire your battery bank in series than parallel so hopefully you can choose a battery that is very close to the capacity you need.
The number of solar panels needed to maintain the battery bank is much more complicated. I doubt I could do it justice in written form here. But it is better to have your panel array be too big than too small for the battery bank. Too small will mean your battery bank may be operating most of the time in a half charged and half cycled condition and it will shorten its life (lead acid anyway).
Awesome video Brother! So, Does 771.5 amp hour means I need 8 batteries at 100amp hour each? Thank you for your time!
Thanks! Yes, that is one way to break down the components.
Awesome video! Now how many solar panels do I need to keep this battery array topped off?
How many amp hours of batteries did you decide you need? Where do you live?
Great video. In my experience, if you can afford it, particularly lead acid, keep them 60% or above. Also, many deep cycle batteries are not true deep cycle, so I base my calculations on 50% of advertized Ahr rating. That, with 40% load, you should have a healthy margin for error.
Good thoughts. Thanks!
Pretty sure you read a Law of attraction book on audibles. Very distinctive voice. Awesome video by the way.
Haha, I wish. I have only been paid one time to do a voice over and it was for a video for an Amish produce farm. Thanks for the feedback and for watching!
Lights? System inefficiency? You included battery DOD issues, but left out the rest of the system (inverter, wire loss, etc). But still a pretty good explanation.
I agree that he needed to include some efficiency losses but he did a pretty good job of explaining the basics to a beginner. It sounds that you are like me and already know what you are doing with solar power! Take Care buddy, John
using your calc I think I need about 1500 amp hrs, I can't figure out how many powerwall2 that will require but I will buy 3 regardless. My question is cant I use a 15 kW generator and transfer switch to back up my powerwalls thus avoiding the extreme anal raping of the utility companies in the Houston area? Besides the powerwalls and the panels will a charge controller be required or are they part if the powerwall construct, and what size panels do you recommend for such a large system. I really dont have any ass left to give the utility companies I will rather be totally off-grid.
Hi friend. I would add to this number at least 30% extra and reason for it is that you never know what might happen..you might try to buy new tool or you might get extra person in your house and you didn't count with it. So i would suggest to add extra amount just to be on safe side. I know it cost money but yes you have to invest extra because at then end you want still some comfort and you are not living alone..... Well lithium batteries are not cheaper only if you are able to get some from used car or from car that had accident or such..but if you would buy them new then they will cost a bit more. They have own problems but that is that different technology ...and don't forget all equipment(battery, inverter, BMS) and such needs to have exact temperature....they don't like very low or very hot temperature..that is one thing to consider. Anyway nice video. :)
I agree. It is good to have some extra just in case.
The freezer and refrigerator units should be trashed at that consumption! Way cheaper to go with more efficient devices than more battery... I'm guessing you could cut the final amperage number by 2... or double the number of cloudy days. Good video.
Thanks. Yes, if it were me I would splurge on a DC powered fridge and freezer and it will save me money over time. But that wasn't really the point of the video haha :)
So what happens if I need to run 4 devices that run off 220v and consumes 1000 watts PER HOUR EACH, off grid?
For 28 days from January to February, my Pennsylvania home used 82 Kilowatt Hours of electricity per day !
You growing weed? Lol
@@evergladescreations9641
Lol,... Nah, older house & the heat source & everything else is electric.
Hi I like this if you can help me how to find the right battery for my solar panel 275×3 panel.
Where do you live?
No need to pack more than you can charge, the better is to get upgradable set-up
you need to look at some of hb powerwall video's the game has changed
A powerwall is not an off-grid battery bank. It is more like a UPS.
Hi thanks for the video! Once you have the battery, how do you pick an inverter? What does the wattage of the inverter mean?
Is there a device you reccommend that tells you how much power is stored in the battery so you can keep tabs on your usage? And is there an option for an auto-off, before the battery dies?
Thanks so much!
Alessa E, you first need to find out how many watts you use in an hour. Then add 30% to that number. You never want to max out your inverter all the time. Then you can find a battery monitor system for your battery bank. Midnite solar has one built in there charge controllers that I use. It keeps a log for over a year. There are others just do a google search.
@@rigginsranch Thanks so much!
He actually printed a battery the size of a pack of printer paper that is rechargeable and he runs an electric powered moped on it I don't know currently what the kWh is on it but it looks promising!
How about the 80% battery efficiency? If you put 10 Amp in your lead-acid batteries, you'll get only 8 amp out. Even less when they are older. Please add that to your calculation: divide the battery capacity you found by .8. By the way, that is another great advantage of lithium batteries. They are around 98% efficient. Too bad they're so expensive.
To be really safe take all these numbers and double them. That way you have some extra and have a little future proofing built in. Same for solar panels and/or wind/hydroelectric generators.
If you want to be super conservative, sure.
what was the time frame for your calculation, did you use total per week, month, or day?
Live in a property which exceeds, $2000-3000 in electric bills alone. Three homes, 6 people per house....
What would you opinion be on this?
The calculations were on a daily basis. So the batteries would be deep discharged daily and have enough reserve capacity to allow for 3 days of reserve power.
How many amp hours of lithium iron phosphate batteries would I need to power 1500 watts (close too ) for 18 hours a day ?. Roof is south facing at between 10-14 degrees . Southern California. Thank you 🙏🏼
Wow. That is a big boy load. The rough math would be 27 kWh but that would be draining them to zero with no room for error. So add in however much margin you want to that. Also make sure you add in an extra 20% if your load is AC and you are going to be powering it from an inverter. If it is a DC load you don't need to worry about that.
im really sorry and confused........so the total 771.5 that you found is for using those appliances for the chronic period each day for 2 days and draining the battery only to 75% right?
Excellent video! Sub’d. Any update for 2022?
It is definitely on the docket. I plan to go back and revisit several of my most popular solar and battery videos over the winter.
Thumbs up!
Thanks, I appreciate it! And thanks for watching.
I want to use 10 hp motor 6 hours a day , I want to power it just by using only batteries, is it possible? If possible how many batteries I will have need ?
my problem is I have a 5 kW inverter. and a 200 ah 24v lead acid battery bank. for a off grid home. no solar yet. and have to run the generator every time I turn around. it sucks running the gen so much. trying to save funds to buy more batteries and panels. I am not picky about battery chemistry. I just bought what I could afford. great video
Thanks. Buy what you can afford is a great start. If you are careful and thoughtful you can design your system so you can upgrade later. Get a nice charge controller and just start adding panels one at a time as you can afford.
LDSreliance
that's my plan. get away from using the generator so much. I don't mind using it on laundry day and what not. I also hope to build a water wheel generator. to help charge the batteries.
That would be cool. Do you have running water on your property?
No-one in their right mind is using lead acid any more. The maintaining of battery health and limited depth of discharge compared to lithium leaves them on the scrap heap
Totally untrue many can't afford any other type of battery also many like me live in cold climate and keep the battery Bank outside where my solar equipment is lead acid takes a charge just fine in cold weather other type do not there also cheap to replace should one die randomly for what ever reason I could think of more reasons but you get the point every tool has a place a single type of tool will never fit every job
Hi I Live in the uk and I’m off gid I’m now on a 12v System but I’m going to sleep up to a48v System and I got on 12v 910 amp ours will I need more batteries if I go 48v thx ???
No, you won't need more batteries but you will have to re-wire them to configure them for 48V unless your charge controller can handle 48V input and 12V output.
Thumbs up... ENJOY.... THE SIMPLE LIFE
Thanks!