How to charge a second, smaller twelve volt battery in the engine compartment?
this may be the wrong sub, but ill ask anyway - how to.maintain and keep charged an auxiliary 12v battery in the engine compartment? Thinking small lawnmower battery sized, 10AH, 160 cranking amp sized.
Can it just be parallel wired to the alternator? Will that throw off the rectifier or mess.with the ability to maintain the main battery? Other solutions?
I'm messing around with devising an electric supercharger/blower system.for some mild boost in PSI at lower rpm's. 12 volts is enough to drive the electric motor well, but I don't think I want the snort term surge of current draw on the main battery. I suppose I could keep them completely separate and just plug the small battery into an external charger once a week, but that seems a bit messy.
Any wisdom shared would be appreciated.