Clamp meter

[tripper]

John, thanks for the advice. I will drop my battery down to ~12.6 volts that should be around 20% SOC when I'm not actively using it, my RV systems all run off the 105AH Trojan battery I also have installed.. Do you think it would work to set the float charge to 12.4 volts while storing the LFP battery to prevent it from getting too discharged?

I read your article, good LiFePo general maintenance advice, it would make a good sticky for the solar forum.

BTW my Victron SmartSolar controller (150V/85A I think) has a built in relay which is user voltage selectable for when it activates.

 

[John61CT]

All sounds good.

I have seen no evidence of a float set below resting X% SoC causing any "harm", but Maine Sail's been consistent in advocating for "just stop" until a charge is needed.

Keep in mind lifetime (other than stored shelf life) is counted in "cycles", so "what defines a cycle?" becomes very relevant.

I would say in general, resting in storage as much as possible, in cool temps, is ideal.

But definitely ensure you don't let them go below the bottom shoulder, whatever SoC you choose for storage assume 4-6% self-discharge per month at warmer temps and do regularly check and top up!

Ideally this would of course all be automated by the protective electronics infrastructure.

 

[John61CT]

> random Ebay one

EWT 100AH

https://m.alibaba.com/product/60621690062/Best-Selling-EWT-12v-100Ah-Lithium.html

Apparently this is the BMS included, PCM-L04S50-674 http://www.quawin.com/?c=products&t=v&vid=4566593500084f71870c9bc87a09d945

goes for 60¢ on Alibaba