NSM wrote:
"Jim Yanik" . wrote in message
.. .
"cnctut" wrote in
oups.com:

Any reliability issues concerning a new Sharp R-1540 microwave to
power
it off a square wave inverter when camping? Is there any real
difference between "square wave" and "modified square wave"
inverters?

Iron-core transformers do not like square waves-the harmonics just
generate
excess heat in the core.You would need a hefty inverter to power
the
average MW oven;they run about a kilowatt output(~15A@120VAC
input),and
with an iron-core transformer,the startup surge would require more
inverter
power.

"modified squarewave" inverters generate a stepped version of a
sine
wave,reducing the harmonic output.

An inverter microwave might work better since they rectify AC to DC.
--
N

NSM--isn't there some 120vac in the microwave unit somewhere--AC fans,
motors, etc?