"Stan Shankman" writes:



I also had the thought of just using a car (or deep cycle) battery with my
unit but upon further reading, discovered that I might have problems that
way with completely dead battery charging. This is so, presumably, because a
dead battery presents a larger load to the existing charger. So I'm
wondering if anyone can speak about that issue.


Yea; don't worry about it. I put 50AH batteries on my 900VA SmartUPS that
had ?6-8? AH originally. Yes, it charges slowly. It may take a few days.

But the charger puts out what it can, and the resistance of a discharged
6AH string is not much different than a discharged 50AH string.

And it was nice having a UPS that lasted ~24 hours under light loads...

But forget the car batteries; use deep-cycle ones.

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