I got a Cyberpower CP1500PFCLCD which is a pure sinewave version costing $200. It is confusing as there is also a model called CP1500AVR and CP1500AVRLCD. AVR means that it isn’t an actual sine wave, but a triangular. Not so good theoretically for modern power supplies that use PFC. If you can get away with it, the AVR model is even cheaper as it doesn’t have an LCD, so the hierarchy is PFCLCD > AVRLCD > AVR
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