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JohnH avatar image

BMV-712 charge voltage for 2x 12v lithium in series for 24v

I have two 12v lithium batteries hooked up in series for a 24v system. On my BMV-712 what do I set my charged voltage at?

Lithium Battery
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Justin Cook - Bay Marine Supply USA avatar image
Justin Cook - Bay Marine Supply USA answered ·

@JohnH, as specified in the user manual, your "charged" voltage should typically be 0.2-0.3v below your float voltage. A typical 12v nominal LFP battery floats at ~13.2-13.6v, so let's say 13.4x2-0.3v= 26.5v; I'd use that as a starting point and adjust from there as necessary or as defined by the float v of your particular batteries.

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JohnH answered ·

Thanks Justin, I’ll give that a go. My batteries didn’t come with details of the float voltage, so in the dark a bit.

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Ahhh nuts, that's a drag... what batteries do you have?