My existing "smart" battery charger won't turn on if the battery is completely flat, and it will shut off if the car is drawing too much power. Well, I plan to run my BMS and a fan while grid charging my high voltage battery all night, and I'd like to recharge my 12V battery at the same time.
I could get a MeanWell RS-50-12 (for $23!) which can supply 4.2A @ 13.2V. However, if you ask for more power than that, as battery charging would do, it goes into hiccup mode, shutting down then powering back up. No good for powering my BMS.
If I add the current limiter illustrated here, do I then have a cheap, fast 12V float charger that doubles as a 12V power supply?