Works as advertised
I bought this unit because I needed a power conditioner that provides a pure sine wave for an AC motor I use. This unit is a good value because the price is much less expensive than a dedicated AC regeneration power line conditioner. AC regeneration units cost typically well over $1000.00. I also use the unit for a preamplifier that requires a pure sine wave source; otherwise, the preamp emits a low level buzz when plugged into the wall. The online UPS feature is great because there is no delay when there is a power outage and there is a switchover to battery power. There is no surge suppressor capability so I recommend the use of a good surge suppressor such as a Brickwall Filter or better. The only thing that keeps me from awarding a 5 performance rating is the noisy cooling fan runs continuously and there is no hard shutoff switch to turn off the unit. To shutdown the fan, the unit has to be unplugged from the wall. Other than the noise, I recommend this online UPS. I speculate the newer versions must have a shutoff switch.
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