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w_tom
 
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2% THD would be sufficient for anything. A higher number on
the inverter should be less than what specs permit for that
appliance (ie furnace). 20% THD is probably what that
inverter is outputting meaning that it causes stress to
refrigerator and furnace - but is more than sufficient for
electronics.

Notice a shortage of numbers. This because too many just
somehow know and don't need the numbers. Well, to answer your
question, numbers are required. There is no way to answer
your question without those numbers. Less than 1% of us
understand those numbers ... which is why the other 99% should
be demanding numbers. So that the 1% cannot blow the whistle,
many manufacturers intentionally don't provide numbers. Then
people in your position only get answers from those who don't
really know such as, "I did it and it did not explode.
Therefore you can also so it."

Toller wrote:
I am guessing that THD means total harmonic distortion, so
something like that, and also that HF doesn't provide it.

But, in case they do, what sort of THD would I be looking for?