Solar Charging LG Chem Batteries While Using BMS

UBigDummie

New Member
Hey guys,

I've been using solar for small projects for several years, but I've recently bought some new equipment that I have never used before. I need some advice on how to charge these batteries using my equipment.

The charge controller is a Victron SmartSolar MPPT 75/15. The batteries are LG Chem N2.1 3.6V .

I'm planning to use these in a 4P2S setup. I have never charged lithium with solar and I have never used a BMS. I do have a couple types of BMS units. The two I have are these from eBay:

https://www.ebay.com/itm/4S-12V-60A...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

https://www.ebay.com/itm/4S-7S-8S-6...var=611986974999&_trksid=p2057872.m2749.l2649

Can anyone explain to me how to wire this to charge these batteries with solar?

In the past, I have always just connected my panels and battery directly to my controller and I haven't had to worry with a BMS. Now I'm worried about blowing something up because of them being out of balance or something.

Basically, I just want to set this up to get 12 volts out of these batteries to power a Victron Phoenix 12|375. I heard in a YT video, this inverter could run on 7 volts. If that's true, would it be possible just to use 4 of these batteries in a 2P2S setup?

Ultimately, I just need to power some low voltage equipment. I have several devices that will pull less than 100 watts total.

Thanks!
 

snoobler

Solar Honey Badger
The BMS is wired in series, so the current goes through the BMS on the (-) terminal of the battery. Hopefully your manual clearly shows this.

You can look up the datasheet and specs for that inverter on http://www.victronenergy.com. I would be surprised if it does. Even if is does, you want to do at least 3S. If it will work a little above 16V, go with 4S.

Keep peak voltage at 4.05/cell and min above 3.3V/cell to get maximum cycle life.
 
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