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Old 07-06-2020, 09:47 AM   #1
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24V Leaf battery setup

I can across a site selling leaf batteries in 24V configurations. I didn’t think it lended itself well to 24V setups. Doesn’t it run like 23V setup? Curious if anyone has this setup? Do you have to setup you solar controller different since the nominal voltages are different?
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Old 07-06-2020, 11:01 AM   #2
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I'll wager they run over 25v given that LiFePO4 cells are in the 3.2 range I'm guessing they run 8 cells in series for 25.6 or more at 100% SOC.

Depends upon your solar charger but my blue sky chargers could handle that. I would probably have to reconfigure my panels from the "12v" all parallel to a "24v" series/parallel configuration. That would be a lot of rewiring.

I've never heard of a 24v coach seems most are 12v.

For our coach I'd have to change out the inverter to a 24v inverter/charger and add a 12v power supply to run all the 12v stuff, disable the chassis battery combiner, and who knows what else. If I was going to do all of that i'd look at all the voltage options, 48V, or more.
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Old 07-06-2020, 11:15 AM   #3
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I run 21 kw of leaf batteries at 57 volts on my home system with 250 volt solar controllers. Thought about it for the coach, but as cruziered said, a lot to change out and modify to do a 12 volt coach. Can be done, but was not worth it to me, so stuck with 12 volt batteries.
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Old 07-06-2020, 03:43 PM   #4
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I am going to run a 24V inverter to run the 120 items. Then I am going to run a 24V to 12v converter for my 12 volt items.
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Old 07-06-2020, 04:07 PM   #5
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I am going to run a 24V inverter to run the 120 items. Then I am going to run a 24V to 12v converter for my 12 volt items.
Good luck, probably 99% of leaf battery applications are 48 volt for a number of reasons. You will have to buy a fairly sophisticated solar controller because you will have to set up charge voltages for your particular battery pack. Don't know what coach or trailer you have, but you might be surprised when you add up all the 12 volt loads.
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Old 07-06-2020, 04:42 PM   #6
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I have a 48v leaf battry pak. 21k. Use a dc/dc buck converter 48/12. 80amp. Runs everything 12v just fine. Just hook up where the converter hook was.
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Old 07-06-2020, 07:02 PM   #7
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I have 1.2kw solar on my roof. Probably could extend to 1.4 with a different controller. I bought the Victron 100V/50A 12/24v solar controller. Planned on using a Tesla battery but maybe 48V is the way to go. Still thinking.

I have seen leaf batteries sold in 24V configurations.

https://www.techdirectclub.com/24-volts-nissan-leaf-battery-g1-module-lithium-ion-1-5-kwh-66-amh-lot-of-3/

I didn’t know if anyone had used something like this. Looking at the BYD battery too but it is a heavy beast.
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Old 07-06-2020, 08:38 PM   #8
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I have 1.2kw solar on my roof. Probably could extend to 1.4 with a different controller. I bought the Victron 100V/50A 12/24v solar controller. Planned on using a Tesla battery but maybe 48V is the way to go. Still thinking.

I have seen leaf batteries sold in 24V configurations.

https://www.techdirectclub.com/24-vo...-amh-lot-of-3/

I didn’t know if anyone had used something like this. Looking at the BYD battery too but it is a heavy beast.
That solar controller does limit you. Not sure if you can set proper lithium voltage profiles without a dongle, or computer with interface for Victron connect. Might watch the Will Prowse videos on u tube, He tests a lot of lithium batteries, sometimes he finds good deals on the batteries he tests, Don't forget you can do a 12 volt system with that controller or even two 12 volt batteries in series if you must have 24 volt.
The Leaf G2 series batteries are better than the G1. Don't forget you will have wire your own BMS to the batteries in your link.

Not trying to rain on your parade, but using lithium batteries is not plug and play like most lead acid batteries.
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Old 07-06-2020, 10:08 PM   #9
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I have the Victron BMS-700. I am at the point I need to find a battery and start going. If I use 2-12V batteries, do I have to have a balancer or something to make sure they charge equally or does it do that normally?
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Old 07-06-2020, 10:47 PM   #10
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I have the Victron BMS-700. I am at the point I need to find a battery and start going. If I use 2-12V batteries, do I have to have a balancer or something to make sure they charge equally or does it do that normally?
If you mean the BMV-700, that is a battery monitor, nothing to do with your solar controller. If you use two 12 volt batteries in parallel for a 12 volt system, you are fine, if two batteries in series 24 volts, also good. If you need to get underway soon, just get some lead acid batteries, agm, gel, or regular batteries and go, your solar controller should be setup for them.
Then go to the DIYsolarpower forum and read up on lithium battery packs, and what you need to use them.
Like I said, for most situations, retaining you original 12 volt system is the way to go. Plus your inverter, inverter/charger, or converter is already setup for 12 volts. You are probably now set up for 12 volts, so just get new batteries and go.
Before I went to lithium, found some good deals on agm deep cycle batteries on Craigslist.
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Old 07-15-2020, 07:57 PM   #11
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I am going to run a 24V inverter to run the 120 items. Then I am going to run a 24V to 12v converter for my 12 volt items.

Are you doing something special for the Brake-Away trailer brake?
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Old 07-15-2020, 08:10 PM   #12
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I'll wager they run over 25v given that LiFePO4 cells are in the 3.2 range most are 12v. ...
They are not the safe LiFePO4 cells. These will flare. From Tech Direct link:

"DO NOT pierce cell with a sharp object such as a nail." "DO NOT use, leave cell close to fire or inside of a car where temperature may be over 60'C." (140f)

The BMS does not have cold temp cutoff.
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Old 07-15-2020, 09:12 PM   #13
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Quote:
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I am going to run a 24V inverter to run the 120 items. Then I am going to run a 24V to 12v converter for my 12 volt items.
you don’t need a new converter. You converter runs off 120v already and provides 12v. So just run it with all the other 120v stuff.

And of course you are right to be skeptical since there is no multiple or 4.2v to get you to exactly 24v so there is no telling what they are selling, not to mention generation, age, condition etc. My leaf modules are set up in a 32.8v confirmation at 4.1v max, but my inverter is a Victron 24/3000. And my converter is the OEM unit, plugged in to the OEM outlet, powered by the Victron inverter.
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Old 07-19-2020, 10:45 AM   #14
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Yes, converter will work. you will be converting 24v dc to 120v ac and then 120v ac to 12v dc. Much simplier just use a buck dc/dc converter.
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