[quote=spdrun]Input waveform doesn’t matter as much as you think. Most modern PSUs rectify the waveform before chopping it up at a much higher frequency than 50/60 hz, to power a high-frequency transformer.[/quote]
Well, some power supplies on some computers don’t work with a stepped up sine wave. Amazon, unfortunately has a no return policy on the UPS because they don’t want to deal with the potential haz-mat issue of returning a battery.
I already bought one from amazon, and was defective and couldn’t even turn on. They just refunded me the amount and told me to dispose of the unit.
