I read a book, "The People's Guide to Basic Solar Power" that talks about home-brewed small solar power setups. In it the author discusses the cheap inverters and the slightly more expensive (modified sine wave) inverters and he saw no problem with using them. Some products that use electric motors won't run as quietly as with a pure sine wave inverter, but he claimed that he'd not had any trouble with these cheaper inverters and had been using them for years. That said, I have a cheap inverter and I use it (only occasionally) for whatever I need to power.
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