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Hi,
I've got 2 lifepo4 160ah battery:
- one old (non smart)
- one new (with smart option
Both are managed with an external BMS ve.bus.
I don't want to put the battery in parallel because one is more than 3 year old and the other is brand new. So I decided to put a 3 way switch for choosing between the first or the second battery.
Can I monitor my state of charge of the both battery with a BMV 712 ?
I make a scheme for better understanding:
Is my wiring good ?
Ok, I'm answering my own question, I was pretty sure that the BMV can get the % of charge of a second battery. But he can only get the voltage of the second one.
So it is impossible with 1 BMV and 1 shunt, I need 2...
Yes, for SOC you need two.
Your diagram above wouldn't work, either, Ancienne batterie would bypass the shunt. So no current monitoring either.
