Off-grid Solar Myth Debunked and Explained: 2 or more Solar Charge Controllers + 1 Battery
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- Опубліковано 27 лип 2024
- Does off-grid solar confuse you?
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Contact Information:
I am NOT available for personal solar system consult! If you wish to contact me, this is my direct email: williamprowsediysolar@gmail.com
Join the forum at diysolarforum.com/ if you wish to hang out with myself and others and talk about solar
FTC Disclosure Statement and Disclaimers:
Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :)
DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program,
An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com
*HI there I dont know if you can help me on this issue. But what if its a hybrid controller that has its own solar and wind turbine and want to connect another wind turbine that will have its own controller?*
This is perfect, i have been hunting this answer for months. Glad i finally backtracked and found this video. I'd love to see the wiring diagram for this setup to make sure i understand it.
Will, all of your videos are very good. But I have to say this video ranks right at the top because of how you explained so much valuable information in an easily digestible manner. Absolutely top notch effort.
One other benefit that may have not been obvious is if your system starts out with a 20 amp solar charger and one day you need more amps, you can still use your old 20 amp charger and simply add another 20 amp solar charger to your system. Previously I would have thought I would need to junk the 20 amp charger and upgrade to a single 40 amp charger.
So very helpful! Keep up the great work.
i have tried that on same in coming line off the panels it seem to cancel the other charge out
You're a genius Will! Keep up the good work man for you'll go very far in life! I've been through college for engineering, plus I work on electronics in the US Air Force, and I have learned more from you about solar systems than I ever have in school and through my entire AF career! Thank you!
I agree...l don't know ur personal history that well to fully appreciate what happened to you and how it relates to us. I have essentially made this same comment before. I have a physics undergraduate degree from the dark ages 1969. I understand the basics you do an excellent job explaining using them. In fact having taught and developed technical curriculum all my life, l truly admire your talent...it exceeds mine.
On the complex specifics of the different battery types, you've touched this in a previous video. I'm happy l recall seeing that because l couldn't grasp all the content you shared. One way video learning is tough because we don't get to ask questions...not ur fault at all. But learning that the key is battery resistance that's affected by internal factors specific to that battery's chemistry and a host of other generic factors like temperature was powerful. You repeated that several times in a very effective way especially after you shared a content chunk of info. It helped me to not get distracted as you were sensitive to from other info sources. I have 3 solar panels...2 abt 360 watts n a 100. I have 2 Victron controllers connected separately to ea of the larger panels (if l knew l would later expand l would have purchased a larger capacity controller to save money) But did expand and my single controller lacked the capacity. I didn't realize l cud have connected these 2 larger panels in series avoiding buying a second expensive but worth it controller) My 100 watt panel feeds a simple PWM controller. I learned before my 4 6V batteries connected series-parallel for 12V. Thanks for your patience and appreciation of the confusion us non expert solar power guys out here. 👍👍👍
For real, we need this dude in Jones Hall
You have an amazing gift Will, thank you so much for sharing your knowledge with us.
I just watched another video claiming that two SCC on one bank would fight one another. That was the first time I heard this and the video had an over 200k views. I am planning on two controllers for our boat and was concerned. But, Will to the rescue, as per the usual arrangement. Thanks a bunch! You are the definitive Solar Authority!
Wow! You are the best youtuber on photovoltaic offgrid system
Thanks so much. I'm to learning this. I want to first set up a system for a camper and secondly set up a totaly off grid system on my daughters house. Your videos are very thorough and informative
I wish I could talk like you. I had to watch your video more than once because I couldn't focus on anything other than watching how easily you can say words with such grace and perfection.
This Is Very Interesting! The Info Was Huge And Very Informative. Heat And Cold Lead Acid Vs Lithium Ion Is Fascinating! Good Video!
Hopefully, in 3 years I will start to understand SOME of the things Will is talking about.
Thanks, Will that was one of my concerns of different solar arrays grabbing the sun from different angles.
Wow. This is the best solar charger explanation I’ve ever seen. It actually answers all of my questions in one video, as I go out to buy another panel. Thanks Will!
Thank you. This was exactly what I was looking for. Connect all the solar charge controllers to a bus bar. Ideally one per panel. Put all of them near the bus bar so they see the same voltage. Then attach the battery(ies) and load to the bus bar.
And with will also work if you attach a AC to DC and/or DC to DC charge controller(s) to the bus bar as well. Just need to have the same float and boost voltage setting.
This includes petrol generator AC or DC to DC charge controllers and wind turbine charge controllers.
Thank you Will. I think that answered my question about running a generator with my charge controller.
Very nice, I was wondering about that. I'm building a 400 watt / 200 Ah solar for a small 5th wheel. Putting the 4 panels on the roof and was thinking about a suitcase for those shady spots. This clears up my options for wiring the suitcase into the system. Thanks for the info!
Great vid. When you gonna get into Wind Turbines, Kinetic-solar, Kinetic-aquatic and Electro-Static charging? It would add a twist to your excellent Solar vids.
Great video Will. I have always had two solar charge controllers connected to my battery bank. You are absolutely correct, no problems as long as the batteries can manage the charge. The reason for two is redundancy
another masterly exposition, great stuff Will
Brilliant. This helped me with my query about using mismatched solar panels....but I will have to re watch a few times! Thanks Will.
Thank you for putting my mind at rest on this subject. I can now improve my system to maximize my roof area for additional panels and minimizing the shading problem I have 👍
Great to know this info. I have trees in the back yard and more sun in the front AM. I could run 2 controllers on separate arrays in accordance also utilizing the best solar panels for their respective output for straight sun and partial shade. Great to know this. Thanks Will.
@Bmillmine yeah, I can't do that, but I can work out a plan for best efficiency of panels with that in mind.
It made plenty of sense and answered a lot of the questions traped in my head :D
Thank you Will I have ask my Rv dealer and the Rv manufacture of my Rv and their techs could not or would not give me any satisfaction about solar applications. Have watched many of your videos on batteries and solar information and you have helped me more than anyone, Thanks again!
The first rule about charge controller fight Club is....
Ask Will!
And don't worry about it.
Great information and interesting videos Will ! If I haven't said it yet having found your channel a while back now. It's like a master class in solar energy. Thank you very much !
Wow, someone on UA-cam that actually knows the subject they are talking about.. And without any ego.. Very informative video if you live off grid
Good Information! This solved my build with 12v solar system.
2 x 40ah MPPT Solar Charge Controller
4 x 120ah 12v Lead Acid Battery
4 x 320w pv panel
1 x 2kw 12v Pure Sine Wave Inverter
Very nice, will.
Exactly what's needed to show and prove. Good hint for the equalization (it can be deactivated on many controller)
I love your channel, you cut right thru all the crap ...and call BS and marketing hype and misinformation.
Gr8 presentation, it gave this neophytes queries some clarity form the basics to a bit more advanced ones. We have a load of questions on Solar. Q1, Multiple controller charging one battery bank. Your comment at 00:45 covered that (10 or 20 controllers on one batt bank). We may be going 48v lith to pwr our Sol-ark 12k. For starters, we will have 5-PV on the East roof, 5-PV's on the west roof (more to be added on other building in time). We also wish to have a charging station for our 12v tractor batts. We will also like to hook up a pelton wheel on the 48v. A bank of 10 / 20 controllers answers a lot of questions.
Thanks Will, this is what I was looking for and the answer to the question I asked you yesterday. Now I have the answer and I see I can connect every charger to the same time to the battery, MPPT + dc-dc from alternator and even sore power charger. Thanks dude :)
Awesome!! Glad I can help :)
Can you put the power from mppt into the DC to DC charger? We want to be able charge 2 types of batteries (Lead Acid and Lifepo4) from 2 different sized solar-panels each on separate mppt, and an alternator.
Valid answer to a valid question . Thanks again , Thanks All
Hi Will! Great informative video! Keep up the good work my young friend.
Thanks, I am old and new to solar, but using 5 charge controllers was what I thought was the best idea just for redundancy and if one or two go out I still have enough solar to do till I get them replaced. If one panel is shaded still have 4 others producing well.
I would love you to build a cheap, light, good aero EV car conversion, from a car that is commonly available throughout the world. Looking forward to the painstaking step by step films, the best selling book, and the kits you sell!
Thank you so much for answering this question. Very well explained. I just installed a 2nd mmpt solar controller and was sure it would work and was starting to 2nd guess myself.
Good job.I have 4 100w BB batteries with 2 360w panels. Thinking about adding more your timing was great. Thanks.
Thanks Will, that answers my question I sent you last week. 👍✌
This is confusing to me right now, but I've got your book on order and if it's written the way you teach on these videos, I won't be confused much longer.
Great stuff👍😀 very impressive presentation, very impressive.👏 thank you for sharing.
I think this is a very powerful bit of information! This means that it is possible - and easy - to build a system in a modular fashion over time. For example, add 4 solar panels and a 20A MPPT every month until you achieve desired capacity. It also eliminates single points of failure! This is really exciting. Is my logic sound? (Like I have to ask folks to comment on UA-cam...)
Yes! I'm using 3 reongy 30amp, 1 is set at flooded and 2 are agm, no problems and yes I'm monitoring the distilled water.
At best I show 14.2 volts at my batteries,
1200watt system. Any added help is always listened too. Thanks for your videos
Brilliant explanation Will.
Was just grappling with this a few days ago.
Ask the universe.... And Will will supply.
Thanks ,only video I've found about multi controller going to same set of bats,I'm new to solar, setting up my first,great video s
Thank you! This was exactly the information I needed.
EXCELLENT VIDEO.. ☺
Well done Will.. Makes complete sense now..😎
Hello Will,
You are an excellent popularizer and super competent, I refer to you very often for battery recharging questions and much more.
I found all the answers I was wondering about.
Thank you for letting us benefit from your great knowledge and experience. You are an important resource for me.
I hope you want to continue for a long time because it helps a lot of people, I'm sure.
I'm sure I have the answer already but just in case,
If I plug in a Renogy DC-DC Charger 20A from the car's alternator and an Epever 20A solar panel controller in parallel, I won't have a conflict between the devices, right?
Thank you very much for your advice,
Jacques
thanks a lot!!! everything you said about the myth..that was what I was made to believe.. now I know better.. again thanks a lot...
Great presentation and very informative... Thank you sharing; just subscribed.. God bless.
This is exactly what i was looking for. Thanks for the info! Very well explained and easy to understand. Regards!.
I have learned so much from your videos. Another awesome video. Thanks!
Well explained... Thank you ... I wish I had discovered this channel long ago
Great video! I asked renogy this same question and they said no. Do not connect separate charge controllers. I have 400 watts of hqst's and 100 watts of renogy. But i know my wanderer 30 amp pwm is only rated for 400 watts. So I wanted to put the 100 renogy on a 10 amp pwm but to the same bank. Thanks alot for showing the numbers! I've learned alot! It's not just taking your word for if. You actually show the numbers and let people decide if they agree or not!
You can use as many chargers as you want with no problems at all... I think the myth that you can`t comes from that when the battery is almost full and only charging a little it will use only one of the chargers to charge, only when the charge ampere is lager then the 1 charger can handle alone it will start using the other chargers.
@a64738 that's exactly what I've seen when full or close to full 1 charger does the work until there more demand and the other makes up.
I think this is good. Supposed rambling was informative. Thanks for sharing
To enable any panel orientation and types sizes, etc, you can solve this by using X charge controllers, group panels by types, all the same orientation on one controller. Different type ans orientation to another controller, and you are good. So you can have morning panels, middle panels, and evening panels. (or 2x more panels oriented for winter for example) This way the max charge current will be lower but you will have more hours. This technique just works beautifully. If you live during the day, and use your main devices during the day, this enable going with a smaller battery and in the end, you've spent less on the whole system, even with the price added of several controllers. And go lithium. reclaimed 7s 18650 are good. 8s LiFe is even better. Lithium require monitoring at cell level, balancing once in a while only.
Great video! My question was, why the controllers need to communicate and coordinate? And, balancing of flooded lead-acid batteries was the answer. Thanks!
This video made my day, thanks for the explanation.
Thanks for your awesome book Mobil solar power I gond it to be very helpful. I helped with the 2018 van build party and it would be wonderful for you to attend the 2019 van build in parker Arizona. Your knowledge with regard to solar would be so helpful and you could do some great videos.
Will another great video keep up the great work love your videos
Safe travels
well time to break out my box of old controllers, thanks for the extra work
Another great presentation of knowledge relating to solar panels, charge controllers and battery types😎
William you are so Awesome.
Thanks...
Your videos are always very informative.
Thank you very much. All You’re videos are very informative but this one answered a question I was wondering about for some time.
This was exactly the video I needed to help me. Thank you.
Brilliant Explanation - Thank You..
Hi Neo
Sorry,your controller is TracerAN 40A series,we don't recommend connect controllers in parallel to charge one battery bank.
Have a nice day!
Best regards
Fred Zhao
EPEVER Support
Answered all my questions within the first 2 minutes, thanks!!
Great videos Will! Subscribed. And the list of your recommended tools used with links is uber valuable. But I'd like to point out you are missing a crimper for MC4 connectors, and would like to know which ones you use? Thanks in advance.
Great information! Thanks. Can you explain how to use xt-60 connectors that are not pre-made? Also what do you think of the Anderson power plugs?
Ive seen a sailboat with a seperate charge controller for each individual solar panel to compensate for shade areas...crazy!
Have you done a segment devoted to temperature v efficiencies of longevity v kWh?
I.E., equatorial heat destroying batteries no matter what (short of air conditioned storage).
Exposition in this segment was good, but probably deserves its own treatment from you for your followers.
Loce your work!
Good stuff Will, thanks ! 👍
I like this. Thank you so much, Prowse. You are a great teacher. Please, for fear of blowing things up as a non-expert, a video with step by step connection of two charge controllers to a three-battery bank connected in parallel as well as in series will technically help.
try to not parallel Lol !!
Thank you you answered some questions I had
Thanks for the information on 2 controllers
Great information, well explained as always. That said I'm a newbie and was hanging on by my fingernails, Hahaha. I Own and have read your book and found it so helpful. I'm rebuilding a 29' 1992 Airstream travel trailer and I'm preparing to design and install a robust solar system for off grid living. I need to understand and comprehend all of this better. I will watch as many of your videos as possible, but what are other good sources of information. Anyone with answers to this based on their own journey are welcomed to comment.
Easy to follow explanation.
Thanks for sharing this.
I have 2 identical solar chargers connected to a battery bank. When the battery bank is almost full it only uses one of the solar chargers and the other one just sit there idle, that is most likely why people think you can not use 2 chargers on one battery... Only when the charging ampere is higher then what just one charger can make it starts using the second solar charger.
These videos are always spectacular. You are truly saving lives when the zombies take over. Thank you.
That's the goal haha
Thank you for the great explanation.
Got it. Your videos are awesome. You make it easy.
Excellent explanation cheers.
Awesome video Will 👍👍👍
Great video Will, I’ve always been told that the MPPT chargers would fight against each each other.
Cheers,
I think this is true only if the MPPT chargers share the same panels, not sharing the same battery.
Andy Lee Robinson what about if I have a caravan with a solar panel on the roof connected to 120 AGM battery via a mppt charger which is parallel linked to another 120 amp battery which has a mppt charger attached and which is feed by tow vehicle
@@mrfourex4070 Fed by tow vehicle? You mean that has solar panels too?
No problem - each mppt has their own set of panels which they manage. Their outputs can be connected together fine at the batteries, (assuming they're both set to charge the same type and voltage of battery)
Rule for mppt is that they control 1 panel, string or array each so they can adjust the input voltage for max power.
2 mppt controllers sharing panels will get confused as they hunt for max power. They will still work, but not optimally.
The outputs only care about battery voltage and current and are independent of the panels.
Hope that makes sense.
@@ahaveland Exactly so
Will like always - good job - keep this pro lvl.
I had every intention to learn more about solar power through this very inclusive channel but ran out of time before we got busy with the landscaping season. I am looking for a solar panel stystem to be able to charge my dump trailer batteries (3 trailers) at night and to power indoor and outdoor light in our small shed (600sqft). I have a gas generator to run our large compressor and power tools. The light are motion detection lights and we rarely use the shed at light. So mostly just need to charge my batteries. I assume I would need a very large system to run my 1.5hp compressor.
Thanks bro made sense and proveed my thoughts on this, 😊God bless.
Great info. Thanks!
Would enjoy a video on midnight classics or outback custom setting for Lithium and the question if they are equipped for Lithium being built for sealed or flood lead acid.
Awesome video mate well done!
i had 2kw of 8 panels wired series parallel going into 2x outback 80 amp controllers and they never shared at all either 1 was in bulk and the other showed battery full and giving nothing or vice versa in the end i put them all on 1 controller and sold the other
The demonstrations are good and the conclusions and advice given are correct. IMO the actual myth the video disproves is:
"you can't (or shouldn't) charge from multiple sources at once"
instead of the stated
"when one boosts the voltage it reduces the output of the other charge controller." (0:05)
Consider what happens when one of the controllers (the shore charger) has a higher voltage setpoint for Absorption: the other controllers drop to zero watts (3:30) as the stated myth predicts. This will happen as the controllers complete Bulk charging at different times due to different voltage setpoints. They all contribute up to their setpoint then fall away as it is exceeded. Normal and expected, and Will explains that behavior clearly.
It's a good video; I do want folks to understand the content without getting confused by myth wording in the intro.
I see your point. Very true. I always have a tough time thinking of titles to the video. What would you suggest as a better title? I thought calling it a "myth" would get people curious. But yes, further explanation was necessary.
Will, I have watched your channel with interest and found it really informative.
I was wondering if the following circumstance might be interesting enough for you to make some suggestions. In Australia, we are only allowed to fit 5Kw system on a normal house, if your house is fitted with three phase power you can increase the system size to 10kW. I have 6kW of panels and a 5kW Growatt, grid tied inverter.
The next step was to introduce a battery. like most you people you cant afford to get everything at once so my plan was to slowly expand and upgrade as the budget allowed. My end goal was to have zero imports from the grid, by way of battery storage and continue to utilise grid back-up as needed or income stream from excess PV credits fed back to the grid.
I am also mindful of battery costs, which I believe is best served (due to currency exchange rates and shipping) to go down the path of using 32 (2x16) x 3.2v Prismatic cells (rated at 280Ah), with BMS. As I am restricted to 5kW of solar panels grid connected, I have thought about using a Victron MultiPlus-II GX (Not that I am completely sure this model will serve my purposes) to act as a hub.
My intent was to plug the Growatt Inverter in as an AC input, have the grid as a second AC input then have the battery bank connected, the Victron would then manage the power usage. Use battery when you can, recharge battery with excess PV power, return excess to grid for credits and finally act as UPS.
Based on the available sun hours in Perth Western Australia and a daily power consumption of around 30Kwh/day. My third stage plan was to install another 5kW to 10Kw of Solar Panels on the roof, these would then be tied directly to the battery and provide charging only. From the regulators standpoint, this is permissible as the low voltage system is isolated from the HV AC side with 5kW grid tied restriction.
Based on the results I would increase the low voltage PV capacity or battery size ( by introducing a third 16 cell string) to find the balance point and nil grid fed power requirements (except for emergencies, bad weather etc)
Cheers
Mick
Many thanks Will !!! Very helpful indeed :)
I was looking at a Flin Energy solar charger/inverter (similar to MPP brand) . On this PWM (cheaper) model, solar max input is 3000 W and Inverter is rated at 5000 W. I was looking at ways to achieve 5000 W inverter output on solar to run air-conditioning during sunlight hours. Using this method, I can connect 3000 Watts of solar to 48V 200AH battery through a MPPT solar charge controller and another 3000 Watts of solar through PWM charge controller in the inverter. Thus I can perhaps achieve 5000 Watts of inverter output purely on solar during sunlight hours. The reason for considering this set-up is a PWM solar charger / inverter in parallel with MPPT charge controller is 30% to 40% cheaper than buying one single MPPT solar inverter that can accept 5000W of solar input.
Wow your subs have grown..great..btw ? where's your assistant Dave 2 D ? lol.....
Good video.
Thanks that helped a lot
THANK YOU now I understand