Different Capacity (Ah) Batteries in Parallel - Current Sharing Explained

[@youcanthide004]

Probably The Best On KZbin. You are A Genius. Thank You!!!!

[@cleversolarpower]

I wouldn't say so myself, but thanks for the compliment 😄

[@EnjoybotLiFePO4Battery]

Great explanation on current sharing and internal resistance!

[@brankarnold402]

This guy is a genius

[@ismaeelismaeel]

Can't believe we're getting all of this for free!! Thanks a lot man ❤ Subscribing immediately 🔥

[@cleversolarpower]

Welcome aboard!

[@MrJosfa]

tak tady moje IQ dosahlo maximum , musim si to pustit jeste 100x abxch to pochopil , dekuji za vasi tvorbu poslal jsem nejake drobne , zaslouzite si to , vase poucna videa nemaji konkurenci , spousta lidi maji podobne znalosti , ale jen od vas je to srozumitelne , pochopitelne , dekuji to translate : so here my IQ reached its maximum, I have to watch it 100 times more to understand it, thank you for your work, I sent some small things, you deserve it, your informative videos are unmatched, many people have similar knowledge, but only from you it is understandable, understandable, thank you

[@brianburg6571]

I'm impressed with the detail you put into these video's.Thank you. I never thought when I first bought my 6000w pure sine wave inverter that so many variables are important. I'd have never achieved the power that I was wanting.😊

[@cleversolarpower]

A 6000W inverter can work, but that doesn't mean it's correctly sized 😉

[@brianburg6571]

Thanks!

[@cleversolarpower]

Thanks for the support Brian!

[@ronsbeerreviewstools4361]

Thanks for posting this informative post, cheers !

[@curtchase3730]

Very good, clean and concise! I never knew how battery internal resistance was done before this. I know you just can't use an ohm meter! I guess internal resistance plays a big part in my older FLA batteries, since the voltage drop gets considerable as I apply heavier loads.

[@cleversolarpower]

Yes, no ohm meter can be used. You will get readings in Ohms, not milli Ohms. Indeed, lead-acid batteries have a higher internal resistance.

[@ОлександрСтепаненко-д4ы]

Very helpful! Thanks from Ukraine

[@adassociates8235]

We just post question on your Multi plus and you pointed to this video, excellent information. But how about charging with different batteries Ah, do you have any video on it? Thank you very much👉👍👍👍👍👍

[@cleversolarpower]

Charging is the same as discharging. You can wire different capacity batteries in parallel (NOT in series). Connect the charging leads to the same you connected your inverter to (or to the busbar).

[@RonaldGast]

I am confused by the topic of this video, as I can't find any battery manufacturer that discusses or recommends using dissimilar capacity batteries in either a series or parallel configuration.

[@cleversolarpower]

It's mostly too complicated to explain, and to avoid confusion and liability issues, they do not recommend doing so. It's NOT possible in series.

[@peteroffpist1621]

Great information many thank for educating us.

[@ShrKhAan]

Bro very good, blessings -> does internal resistance varies with different load/current ? congrats

[@cleversolarpower]

Yes, the battery can get warm which will make the resistance vary, but not by much.

[@jeremyjedynak]

An interesting video would be one where the solar panels and batteries are together on a ground mount pad, and then the inverter is remote (100+ ft away) by the panel and grid connection, perhaps in a garage that is too small to also install batteries into. It would be interesting to see the calculations for whether it would make sense to do this transmitting 48v DC over a long distance, or if there is a good way to boost the battery voltage for the long run, or if the most practical option would be to just invert to 120v AC at the pad and just transmit that to the house.

[@cleversolarpower]

That would be a very bad idea. The cables from batteries to inverter are large, so the cost of these cables and voltage drop do not make up for that. It's better to have the wires from the solar panels longer because the voltage is higher, thus less voltage drop and thinner wires are required.

[@jeremyjedynak]

@@cleversolarpower It would be interesting to see a video comparing the pros and cons of placement of the various components at different distances. I see a lot of people wanting to put batteries near ground mount panels a far distance from the house because they don't have room in their roof and garage. For a scenario like this, you could also show whether AC coupling to the panel in the garage or 48v DC lines to an inverter in the garage would be better or worse.

[@cleversolarpower]

@@jeremyjedynak The answer is obvious. The lower the voltage on the cables, the thicker they need to be. So always avoid low voltage cabling. That's why the solar PV wires can bridge a long distance because panels should be wired in series (adds up the voltage). While you can have your charge controller under the panels, it would cost you a fortune for the wiring because it has to carry the current and keep the voltage drop under 3%.

[@stevecolby6505]

So if you wanted the batteries and wire circuit to provide current from each battery which is proportional to each battery capacity (Ah capacity) so that SOC for both batteries match, then would you adjust the gauge and length of wires to each battery so that calculated conductance of 100 Ah battery is 1/3 that of the 200 Ah battery? Or does this conductance change with varied total Amp load on the combined two batteries?

[@fly4fun24]

How about if it was in series to make a 24v with different capacity

[@cleversolarpower]

You cannot connect different capacity batteries in series.

[@fishingmusician]

Can I hook 2 100 ah 12v batteries parallel and then hook those to another100ah 12v battery in series to get 24v.......thanks for your great videos

[@HR-rt9nh]

what if.. instead of parallel you connected both positives to a bus bar and both negatives to another bus bar. now you have two bus bars positive and negative to draw power from. how would the batteries perform in this scenario.

[@cleversolarpower]

They would perform the same. I tested this before. The only small difference will be a small length of wire which is almost negligible. It was wired like the diagram you can see at the end of the video.

[@Pr_gandhi]

What is the cost of these 100ah and 200ah Battery and how much hour does 100 ah battery run 2, 32inch television with full efficiency And how much time it take to charge and their weight And how to control the heat of the battery

[@cleversolarpower]

1. I have posted the batteries in the description. 2. you can check out my video 'How Long Can a 12V Battery Run a TV?' 3. check my video 'How Long Does it Take to Recharge a Battery?' 4. no need to control the heat as lifepo4 batteries are 98% efficient, so almost no heat generation.

[@nicholasalexandrides4363]

Great video, very easy to follow, but I still don’t understand something. If this setup was run for one hour at the 233 amps (96+137) the 100ah battery would be at 4% remaining, and the 200ah would be at 31.5%. Wouldn’t this result in the batteries having a different voltage, which is not possible in a parallel connection? I thought that the larger 200ah battery would effectively be constantly topping up the smaller battery, both whilst underload and after any load is removed, to maintain an equal voltage/SoC?

[@cleversolarpower]

In a parallel setup, the voltages stay the same. The bigger one will not top up the smaller one. The bigger one will deliver a larger current than the smaller one. So when they get depleted, the voltage of both stay the same and the bigger battery would have delivered more current (Ah) than the smaller one.

[@kamil_balcerzak]

​@@cleversolarpower"when they get depleted, bigger battery would have delivered more current" does it mean that when smaller one gets depleted, the larger one drains more and finally they will discharge at the same time? I mean they'll be (more or less) at the same charge level?

[@kamil_balcerzak]

@@cleversolarpower when smaller one will be at 4% and we disconnect load, won't the bigger one charge the smaller one? If yes, can we prevent it? Because I guess quite big current may flow here, am I wrong?

[@mrcleanisin]

Using a 12-volt LiFeP04 in a car If the BMS kicks off when the voltage gets too high, will that cause the unloaded alternator to burn out the lights on a car?

[@consco3667]

Question. I have a Magnasine MS4448PAE. I have 18-325 watt solar panels feeding my off grid system. We think our gens still run too much. Can I add 9 more solar panels facing more east to catch the morning sun? Or will that be too much for the inverter? Probably get 6-9 400 watt panels. Wire coming into the house is #1 THWN so I plenty of capacity in the wire. I just want to know if my inverter will take it. Thank you. Your book is great! I have a 48Volt system. 8-6 volt Fullriver AGM 400AHr batteries.

[@cleversolarpower]

The inverter you mentioned is an inverter/charger without solar input. You need a separate charge controller to charge the battery. You cannot combine different panels. Check my video about wiring mismatched solar panels.

[@consco3667]

@@cleversolarpower thank you!

[@consco3667]

@@cleversolarpower the charge controller is a Midnite solar Classic. Should have mentioned that! Thank you. Will look up the mismatched panels….

[@cleversolarpower]

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[@ArgieDivina]

THANK YOU FOR FREE DIAGRAMS

[@luisangulo69]

Hello, I have been watching your videos for a while and I got your book from amazon. I am trying to set up a solar system for my shed using 3- 395 Watts Solar panels, 1-100 A MPPT solar controller , 4- Lifep04 150AH batteries and a 3000W Power inverter. I am still alittle confused about the wire size and the MRBF Fuse size. any help please ? Luis Angulo, Phoenix AZ

[@kennyparrish3156]

How do you place a battery monitor ?

[@cleversolarpower]

I made a video about it. Search for 'shunt'

[@sonjakavalut]

Calculating the internal resistance of the battery, the voltage should be measured at the battery terminals, not on inverter, to avoid cable voltage drop mistake.

[@cleversolarpower]

As I've said I'm measuring the resistance of the whole circuit. Don't forget wires, lugs and fuses also have resistance.

[@Dave-xr9bc]

i want to connect my 12v 200ah powerqueen to a new powerqueen 12v 200ah in series so that i have a 24v system.do i need a balancer?some say yes and some say no...

[@cleversolarpower]

Yes, batteries in series require a balancer. Overtime the voltages of the two batteries will drift away from each other. That's why there is a BMS in every battery to balance the individual cells in series inside of a battery.

[@jeremyjedynak]

Why do your videos use a safety factor of 1.25 instead of 1.2?

[@cleversolarpower]

1.25 is from NEC (national electric code) handbook.

[@bryzot7242]

What the?

[@richeastmain4031]

What I learned from this is to use matching batteries and skip the math.

[@cleversolarpower]

You can perfectly use different capacity batteries, as long as the cable is thick enough. As I mentioned you can use the same cable thickness as the inverter, no worries.

[@ilanozana9652]

Or use an amp meter .and also skeep the math.

[@cleversolarpower]

@@ilanozana9652 That requires you to have wires already