|reply to bemis |
Re: two batteries temporarily...
P=IV and I=P/V
I = current (amps)
P = power (watts)
V = voltage
In this case 2000W/120V=16.6A at the output side or 2000W/12V=166A at the input side. Power is comparable at either end, because it represents a relationship between voltage/current.
Of course the conversion by the inverter is not nearly 100% efficient, but that's not really the point. The general idea is that for each amp you need at household voltage you should expect to pay at least 10A at automotive voltage.
Mostly my worry was whether--from a practical point of view--connecting two batteries in parallel would be an issue, it sounds like it generally will not be.