On Sunday 27 November 2005 20:33, jeff wrote:
> On Sunday 27 November 2005 07:40 pm, steve szmidt wrote:
> > One thing to be aware of is that the electronics is built to handle a
> > certain load. Putting a much larger battery, and load, could result in
> > overloading the circuitry. Also the charging circuit has to be able to
> > charge your batteries of course.
> >
> > Granted, I've never done it with a much larger batteries, and I don't
> > know what kind of margins these circuits are built with. But I would
> > imagine that if you connected a car battery to one of these 500W, put
> > over 500W load on it and then turned off the AC you could eastoast it.
>
> Adding a larger battery (or more batteries) doesn't pose a problem to the
> UPS. It (the UPS) will still draw the same wattage at the same rate
> regardless of the battery capacity. Recharging a larger capacity battery
> will take longer, but unless the battery has an internal fault the UPS will
> happily charge whatever size battery that you plug into it.
>
The potential problem with the larger battery is likely thermal. I have heard
(not verified, however) that the UPS circuitry is designed to not overheat in
time duration provided the designed battery. If overheating would be a
problem it could easily be overcome with a better ventilation, a fan, etc.
Don
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