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

"Rolf" wrote in message
oups.com...
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

I have had to remove non-pure sine wave units from new boats a few times due
to one or more of the following:
1) microwave would not work whatsoever
2) PC would not work, as in running Nobeltech, etc.
3) HF SSB noise
4) TV receiver would not work at all
Some of these problems may have been ground loop related, rather than the
purity of the sine wave, such as the TV and satellite converter box using
wall wart power units, the same with some laptop PCs running off wall wart
unit. However, in all cases, replaced it with a sine wave unit fixed the
problem, or substituting a different brand of microwave, etc.
I suggest that for small boats or RVs, use a very basic microwave, such as
no membrane keypad or digital display. A push button, rotary mechanical
timer unit works fine off basic inverters.

73
Doug K7ABX