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Hi Roger
I would have to contend. A square wave inverter will produce harmonics and they be passed through to the AC-DC transformer, even a PI or LC filter will not eliminate it. Pure sine wave inverters are also not 'Pure' they are synthesized and still have a certain degree of harmonics. Any sensitive electronic equipment may be susceptibleto the harmonics. I would suggest make a custom battery box with a deep cycle battery and a charger and run all your equipment directly from the battery and it will also act as a UPS. Only downside is u need 12VDC adaptors for your gear but i reckon it could be done cheaper then a UPS and it will last 10x longer then a UPS, especially if its 70AH or 100AH. The Battery being a massive resistor will clean up any harmonics that are coming out of the mains socket aswell. Cheers
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