Appliances like refrigerators, microwaves, and compressors that use AC motors won’t run as efficiently on a modified sine wave as they would on a pure sine wave.
Delicate medical equipment, for instance, if you use a CPAP to help correct apneas when you’re asleep, you’re going to be better off with a pure sine wave inverter.
Devices that use thyristors like laser printers and photocopiers.
Devices that use silicon-controlled rectifiers.
Lighting that makes use of electronic ballasts, like many fluorescent lights.
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