Re: Cheap UPS at Ebuyer

["Andy Whitfield" <andywhitfield2002@xxxxxxxxxxx>]

--- In ukha_d@xxxxxxx, Jim Noble <yahoo-groups@b...> wrote:
> Dean Smith wrote:
>
> > Any rule of thumb for how long 650VA is likely to give for
a "decent"
> > PC....
> >   i.e. P4 3.2,  Nividia 6800GT, 1 x HDD + 17" TFT
>
>
> The VA rating just tells you how quickly you can flatten the
battery, surely?
>
> What you need to know is how big the battery is.
> Jim

The VA rating has nothing whatsoever to do with the runtime!  :-)
The VA rating is the max load the UPS can support.
It's quoted as Volts x Amps because (rather than watts) due to the
efficiency of the UPS.  Typically the Max load in Watts is two thirds
of the VA rating.  So 650VA is approx 415Watts, etc.

The runtime is relative to...
The number and size of batteries.
The amount of load.
The condition of the batteries (they lose capacity all the time the
UPS is plugged in).  The capacity of a battery is how much
electricity it can store.

Andy