I need to redesign an under-voltage lockout for a 48-volt, 100 AH battery.
As part of the redesign of other portions of the product, I have a 12-bit A/D input available that I could dedicate to monitoring the battery charge and disconnect it via a FET switch, contactor, or whatever.
My question is: After normal AC power is restored, I'll need to reconnect the battery in order to charge it.
Do you see any problems with using an A/D to handle this? I will know when the charger is back online, and can set a suitable hysterisis via the A/D values so the thing doesn't chatter/oscillate.
Or am I over-thinking this?