Hi Lope,
Why not? I have an APC UPS and it holds my AC pump fine.
The only thing you need to check is if the UPS generates a senoid wave. The cheaper ones will not provide it, and it could damage the pump. We had this discussion in a forum here in Brazil, and someone asked the pump manufaturer and that was their response.
So just look for a good UPS, that you should be fine.
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TaTs
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