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wrote:
Do you think that a 60 Hz series resonant LC circuit might provide
enough filtering to allow the use of a modified sine wave inverter?

Or how about runing the inverter output through an isolation
transformer? With either strategy, I think that I'd take a look at the
resulting voltage and waveform on a scope before risking any expensive
equipment.

I would worry about an isolation transformer being rather heavy and not
being sufficiently "low pass" to attenuate the high harmonics of the
cheap inverter. I don't own a 'scope since I retired from microwave
engineering 13 yrs ago but do have an old Toshiba laptop with serial
port on my boat. Are there cheap A-D converters that could turn the pc
into a 'scope?
Dick