twosout wrote: ↑
Wed Sep 16, 2020 3:55 pm
I'm sure you could put an inverter across the auxiliary battery and it would "work".
A 1200W inverter will draw 100A and 2400W one, 200A (keeping the arithmetic simple).
You'd need a similar fuse and some hefty wires, too.
A problem will arise, I fear, if you consume more than half the capacity of the battery (which I'd imagine to be rather modest) because Lead-Acid doesn't tolerate that kind of thing.
I don't know how the aux battery is charged (from the main battery?) or at what rate, but I don't think it will be at the rate required to compensate to support the large inverters suggested. (But Mitsubishi do it, somehow.)
All good points. Having a flat Aux battery is a disaster in these. Ideally you'd wire the inverter via a battery guard to prevent current draw at too low voltage, but getting one that would handle that current would not be cheap/easy (you could always do it via a contactor).
Mitsubishi do it on the factory fit one by tapping off the Drive battery, not the Aux battery. Doing that safely is another level as doing it on a 12V system presents no real dangers to the user/installer (despite the high current, that is irrelevant to shock hazard, it's the voltage/potential that drives a deadly current through the resistance of the body, and 12V cannot drive a high enough current to be harmful).