Hello Stephen,

Just do the math. 2300 watts is about 200 amps at 12 volts!
That's maybe 3 hp with no losses, so your Yanmar can handle
it, but not many alternators will handle 200 amps
continuously. What your alternator doesn't supply will come
from the batteries. They'll discharge fairly quickly.

Forget the electric heater. A microwave might be practical
for short periods, and a power tool like an electric drill
should be no problem at all.

A boombox may be a small load, but a TV/VCR may not be. For
a load of 120 watts, you're talking about a dc current of
more than 10 amperes. Depending on the state of charge and
capacity of your batteries, you could get a couple of hours
of TV from them.

Good luck.

Chuck



Stephen Trapani wrote:
So, say I've got a measley 2 group 27s and my old Yanmar 2GM15 and I
want to by a 2300watt continuous inverter. BUT...

I'm willing to run the Yanmar while I'm using any heavy loads like a
power tool, microwave, or electric heat and I only use the inverter
*without* running the Yanmar/alternator for small loads like a TV/VCR or
a boombox.

Any problem with that?

Stephen