DoN. Nichols wrote:



You also want serious sized wire. They are suggesting #4 AWG
wire for runs up to four feet, and heavier for longer. They are
suggesting #2 AWG which may suggest that is the largest which will fit
the connectors on the back of the inverter.

Gensets, even nat gas ones, seem to be a real pita, and the noise is
considerable, unless you get real pricey.

Given the various limitations of this, I think that it would not
be satisfactory for powering the house -- unless perhaps you had
multiple ones, each run off its own set of alternators and batteries, so
you could minimize the load on each inverter. And check out what you
might have which would not like the output waveform.
Yes, for anything over a couple hundred Watts, you really want to use a
higher voltage, and put 12 V batteries in series. 48 V inverters are
fairly common, also 24 V for use in aircraft. 12 V inverters are really
inefficient due to the huge currents and massive wires required.

The off-grid people often use 120 V DC battery banks.

Jon