Don't know there, certainly he should shop around for price.
He indicated a new UPS for the PC, not the router. The old PC UPS would
be moved to the router.
The purpose of the UPS is to provide time to either:
1. Perform a clean shutdown
2. Start and transfer to a generator
As I noted in my other post, it comes down to quality. If the UPS with
dead batteries is a high quality unit, it's likely worth replacing the
batteries. If the UPS is a cheap unit it's likely better to just replace
the whole thing.
Many of us have equipment in multiple locations in the house. Short of
wiring in dedicated outlets around the house wired to a single large
UPS, it is most practical to have multiple smaller UPSes.
It doesn't. 750 VA does not generally equal 750 W, it depends on the
power factor. UPS typically get rated by VA or KVA capacity at an ideal
1.0 power factor, however since most loads are less then 1.0 power
factor the UPS's real world capacity in Watts is less than it's rating
in VA. Thus a 750 VA UPS is more like 500W capacity.
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