On 7/27/2014 4:08 PM, Mark J Bradakis wrote:
> It is hot here in Salt Lake. I got a small fan for my office to help
> keep me cool.
> I plugged it into one of the non-backup outlets on the UPS that powers
> the Team.Net
> server. Now when I turn the little fan off or on, the UPS beeps a few
> times. Interesting.
>
> It could be a sign that I need to replace the UPS soon. Maybe time for
> a mini fund drive?
> I have also heard that one can increase the capacity by wiring normal
> 12 volt car, motorcycle,
> lawn tractor, etc. batteries into the circuit. Anyone have any
> experience doing so?
You want a deep cycle battery, like a golf cart battery. Auto batteries
that provide a short burst of very high amperage to turn a starter.
They are not designed for continuous high amperage draw and will fail
when used for backup power. The plates in a starter battery are thinner
than a deep cycle battery and more of them. This is too provide a larger
surface area for chemical reaction. The heat build up from continuous
higher amperage draw can warp the plates and cause shorts.
>
> mjb.
>
> ps: About the only thing I remember from all the electrical
> engineering classes I took
> in college is that given enough current, any circuit element can
> be modeled as a fuse.
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