I have a 1500 W modified sine wave inverter. I use it for my microwave
( 600W, dial timer). I only use it for rehating stuff. For cooking I
use my 2 burner propane stove or oven. The amount of time I use the the
microwave is so small that efficiency really does not matter. Actually
I installed the microwave be3casue there was a space, and it was so
cheap ( $50), that there was no real reason not to have it. The other
110V applienaces I use: drill, power tools, coffemaker, toaster, TV (17
inch CRT) VCR, vaccuum cleaner, all run just fine. I think the extra
cost of a true sine wave inverter is a waste of money. My inverter is
hard wired to the 110 V system on my boat with a seletor switch, so I
can ahve 110V power in all of the outlets from either the inverter or
the shore power.
Rolf