Wiring Batteries in Series or Parallel for Off-Grid Solar Power
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- čas přidán 23. 08. 2024
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In my latest tutorial, I break down the technicalities and consequences of connecting batteries in series or parallel. If you're venturing into solar power setups or looking to upgrade your off-grid system, this is for you.
We'll unravel the effects of series wiring, where we add voltage but keep the capacity the same, and parallel wiring, which increases capacity without upping the voltage. Understanding these impacts is crucial for optimizing your system's performance and longevity.
From discussing how series connections can cut down on wiring costs to exploring the longevity benefits of parallel connections, this video covers it all. I'll also explain the importance of not mixing battery types to avoid reducing overall capacity and the necessity of equalizing charge levels before connection.
By the end of this video, you'll have a comprehensive understanding of how to wire batteries effectively for your off-grid solar system. If you find this video helpful, please give it a thumbs up, consider subscribing for more content, and check out my book on off-grid solar power for an in-depth exploration of the topic
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How to connect 4 batteries, two in parallel and two in sirres? Thanks
Perfect diagrams. Exactly what I needed to put my solar batteries back in (I remove them from my cabin in fall so they don't freeze over the winter).
Hi received your off-grid solar power simplified book. I thank you.
hi thanks for your videos. I have 52 AGM 12V and 40 Ah batteries. I would like to create a photovoltaic storage unit (I know they are not indicated but I want to try). What type of series/parallel connection should I make to maximize Wh and get 48V total?
Parallel sums the amps together. (“Parallel” has a’s in the word to help you remember “amps”. “Series” does not.)
Good trick.
i had cable wires shoter and was draing battery more then the other. I have two 24 volt 200ah batterys conneted in series to make 54 volts i conneted it 4 hours ago
I have to go turn of everthing off and paralele the batterys to bring them both the same volts now as one is 78% and the other 100% glad i so your video explained a lot i did not know thank you.
Very informative. Thanks
Good explained
Very clear. Thank you.
Thanks man for the teaching 🤝
Thanks for the information
What is the best configuration to connect three lead acid batteries wired in parallel to the charging and load wires without a buss bar available? Should the charging and load wires be connected to the same terminals?
Yes, all to the same terminals. Main positive on battery 1 and main negative on battery 2. Max 3 connections per battery terminal. Otherwise -> busbars.
@cleversolarpower thabk you for reply.
I meant that I have 1 set of batteries. Battery 1 12v 280 ah and battery 2 12v 280 in series to make a 24v of 560 ah
& a separate
Battery 3 12v 100 ah and battery 4 12v 100 ah in series to make 24v 200 ah.
Could I now parralell the battery 1 and battery 2 to battery 3 and battery 4 (battery 1 and 2 became 1 and battery 3 and 4 became another )
Very useful. Thank you!
I have 300 watts on panels coming in to a 400 watt charge controller. Then from there to a 12v battery with 35AH. Then to a 2000Watt inverter. Can you help me determine how I can improve this or if I’m doing this wrong.
Your battery is too small. Check my video about how many batteries for a 3000W inverter. It's my most watched one.
ive watched at least 15vids just shoeing me how 2 do it i no paralel means not wireing thrm like a worm but do u use the opasite side of yhr negative to the oppadsite side of the negative or can u use the same size and am here like 15bids or 20 vids later i hope this shows me better it lools ok
Best explanation
I intend on taking several 20v 1.5 ah 18650 powered tool batteries and creating a larger more capable battery. My only question is would it be better to make 5 banks of 4v and run that in series , or 5 20v banks
I would increase voltage as it will mean less current thus less thick wire.
@@cleversolarpower the wire and all other components will be oversized regardless. I was wondering if either way is advantageous with regards to capacity longevity and power delivery
I have 4x100Ah Lithium batteries that I want to keep in parallel @ 12v and want to connect a 3000watt inverter to. I'm aware of the cable size requirement with a safety margin being around 312amps and 0000B&S or 120mm cable seems to be what's required when considering what the inverter can draw in current. My confusion is 'if' a busbar is used does each battery connected to the busbar have to have 0000B&S cable interconnects or will the 0000B&S cable only be required as the connection cable at the end of the busbar to loads? It seems to me that each battery will only supply one quarter each of the max current so cable size from each battery to the busbar can be reduced accordingly. Am I wrong?
That is correct. Add a 150% factor to it as i have explained in the video.
If an appliance draws a certain amount of energy, how does a change to voltage increase the battery life?
Increasing the voltage will reduce the current draw from the battery. Less current draw= slower discharge rates = longer lifespan. Check my video about C rate.
Very useful & well-explained video. Thank you ! (=
Is it good if I have a 24V battery that is 100Ah with a 600w/24v inverter? The difference is 5 amps, is that bad?
Not sure what you mean by difference. Send me an email because I don't see replies.
@@cleversolarpower okay
What is the meaning of 0.2c and how did you do your calculation
Check my video about C rate to learn more about it.
Good info.
Good day sir can i connect 2units 55ah 12v and 1unit 100ah 12v battery in parallel connection with the same brand of battery?
If it's lithium and they have a BMS inside, you make two battery banks. One 110ah 12v and one 100ah 12v. Let both batteries go to a busbar. Every battery bank (2) needs to be fused separately.
Could I connect 2 12v 280 ah batteries I have in series (24v now) to two other batteries of 12v 100ah that I have in series (24v now) IN PARALLEL?
2 separate series connected batteries to be connected in PARALLEL?
Yes, battery 1 24v 280ah seperate and battery 2 24v 100ah seperate to make one big 24v 380ah battery. Every battery set needs to be fused.
@@cleversolarpower thabk you for reply.
I meant that I have 1 set of batteries. Battery 1 12v 280 ah and battery 2 12v 280 in series to make a 24v of 560 ah
& a separate
Battery 3 12v 100 ah and battery 4 12v 100 ah in series to make 24v 200 ah.
Could I now parralell the battery 1 and battery 2 to battery 3 and battery 4 (battery 1 and 2 became 1 and battery 3 and 4 became another )
If I connect 2 12v battery in series. Will it increase the watt hour? Meaning more Capacity? For example, I have 2 12v 280ah battery which has 3584Wh. If I connect 2 in series it will has 24v and 7168 wh. So I double my capacity?
No. If you connect in series, only your voltage will be doubled up. If you want to double your wattage, you need to connect them in Parallel, but the voltage will stay the same. If you want to double the voltage and wattage at the same time, you need 4 batteries with same spec, or just buy new batteries.
@@Boiledfoodonly I'm still confused. Let say we connect 2 12v 100ah battery. We will have 24v 100 ah battery which is 2400 watt hr capacity. But a single 12v 100ah battery will have only about 1200 watt hr capacity. So we double the capacity?
@@TienTran-bi1jv oh I am sorry, if it is in wattage, it means power. If the voltage doubled, yes of course the wattage will be doubled too as the formula for wattage is voltage x amperage. But the capacity (Ah) will still the same.
Can we connect 100 Ah with 150 AH in parallel ?
Yes, if they are the same voltage.
Some lithium batteries shouldn’t be wired in series? Is there a way to know when it’s not okay? Im specifically looking to wire 24v Flex tool batteries in series and parallel to double voltage and capacity.
It should be mentioned on the product datasheet. The reason is that some BMS'es are not made for the increase in voltage like 48V. However, most batteries can do that now, it was mainly a problem of the past.
Awesome! Thanks!
WoW never heard about c-rate, and believe me, no e bike owner mention it. Wel i have 4 lead acid each 7 amp. Is it wise to make for mij ebike a c - rate configurations. The controller can handle 12-24-26 volt. Just have them now series it works
4 12V batteries in series will give you 48V at 7Ah. With a 0.2C rate you should only draw 1.4A*48V=67W
Sir plz advised me offgrid solar inverter or hybrid solar inverter
I will make a video about it soon.
good explanation
How can I get your book?
You can get it through the link in the description which brings you to Amazon. You can also get the pdf version on my website. Or your local Amazon website.
Très bien expliqué merci 👍
Thank you for subscribing!
4:20 i dont understand whats the diff hrere in wiring , why is left marked wrong and right marjed as correct?
Every battery is fused and goes to the busbar. This is for current sharing reasons. Also if one battery fails, the rest will dump their short circuit current into it, that's why you need a fuse.
I have 4 x 6v AGMVRLA 6v 75lbs batteries in my RV. They are plugged in, in the combination setup you have shown. I use them to off set pole power as our RV needs more power than the RV park gives us. I want to set up a solar trickle charger over the winter to keep them charged, would I have to change from a combination setup or can I just plug in some solar panels to them with clamps and they will charge them all.
I assume they are wired as 24V? Then having a charger attached to them (positive to batt 1 and negative to batt 4) will do the job.
How Can we connect equalizer 24v for 4 battery in connected 24v ?
Do you actually need one? With 4 batteries this seems less likely. Measure the voltage of each battery. If needed parallel them or charge individually to reduce voltage fluctuations.
Hi, with the c rating when connecting a inverter to draw 240 volts can a microwave capacitor be used to eliminate this issue of having more batteries in parallel?
If possible is there a specific way to wiring.
I have see capacitors in parallel being used in some setups on utube this way for the initial draw.
A capacitor bank will help with reducing the startup current. Microwave is an inductive load so a capacitor bank will help reduce this. I haven't done this before, so I don't have any personal information to share.
Can you feed a single 12v battery from a 24v solar array?
Yes, it's not going to be efficient if you have a PWM. But no problem with an MPPT.
@@cleversolarpower Two 12V peltiers how do i connect them directly to 24V solar panel?
can i series 2 different AH battery with same voltage?
If you connect two batteries of the same voltage but different capacities in series, you will get the correct voltage, but the battery with the lower capacity will be overworked as it will discharge faster than the larger one. This can lead to reduced battery life and potential damage to the batteries.
@@cleversolarpower thanks so much sir for info
May i ask.
If i use 20 w led lights i want to use 12 hours a day how many Ah batteries i need?
20W*12h=240Wh. If you have a 12V battery, then: 240Wh/12V=20Ah@12V. If you are using lead-acid, then multiply this by 2 and if you use LiFePO4, then multiply by 1.2 Hope this helps.
@@cleversolarpower not really understands 😅
@@BlackPearl5077 Try to read again and do the math yourself. Once you understand you can replicate on all your appliances. Or use my calculator on my website.
1:23 that is not the way to size a Charge Controller. A charge controller amps depends upon the Solar Array Current at Maximum Power Or Imp and depending how many panels are connected in Parallel.
No, you are wrong. The current of the charge controller is determined by the charging current to the battery, not the input current from the solar panels.
@@cleversolarpower if so then why do we connect Solar panels to a controller in the first place??
@@giovanninongbri2250 Take your solar panel power and divide by battery voltage, then you have your charging current to the battery. 600W/12V=50A -> 50A charge controller. Then you have to calculate the input voltage, because there is a limit on it. max input voltage = Voc*panels in series * 1.25. If a panel has 22V Voc, then: 22V*3panels in series*1.25=82.5V -> charge controller with 100V max input voltage is ok. Hope this helps.
@@cleversolarpower so you're telling me that the controller makes its own current to charge a battery? the solar array current charges the battery so if you have a 36 cells Solar panel which is considered 12Volts or having a voltage maximum Vmp rating of 17Volts and a maximum current or Imp rating of 8 amps and suppose you have three panels connected them in parallel the total amps would add up to 24 amps, whereby the voltage stays the same as 17Volts, So the current coming from the solar array to the controller will be 24 amps so choose a controller size of 24 amps x 1.25 = 30amps and if you have a single 12V Lead acid battery then select a controller of 12Volts. Hope this helps , I'm an experience in the solar industry with installations and sizing so I believe I'm qualified to share my opinion and the sizing of a controller.
@@giovanninongbri2250 A charge controller takes the total input power from the solar panels, not only the current because power=voltage*current. If you have a PWM, then you should do it the way you described. If you have an MPPT, then you need to connect as many panels in series to the max allowable input voltage of the charge controller. Remember, it is total input power that matters, and not current.
If I wire 212 V lithium ion batteries that are 100 amp hours each and have a watt rating of 3800 WATTHOURS hours I know the voltage will double the amperage will stay the same but what happens to the WATTHOURS
WILL the WATTHOURS double or will they stay the same?
Thank you for anyone who can help me with this ❤️❤️🇺🇸
What do you mean with water? Send me an email because we need to get to the bottom of this well 😄
My apologies I was talking not typing😞
It made water out of WATTHOURS?
It doesn't matter whether you wire them up in series or in parallel the Watt-hours just add up.
YOU CAN SERIES DIFFERENT VOLTAGES. RESEARCH IT
Not on this earth.
John 3;16
Not good engineering practice to connect low impedance batteries in parallel - large circulating currents may result causing potential fire / explosion.
You should only connect in parallel when they are at the same voltage (state of charge).
Your batteties need to be the same make, don't mix them. Especially if they are different. Each manufacturer has their own bms at different charge/ discharge rates and volts.
talks to much and says very little