Thomas Tornblom writes:


My APC SmartUPS 700 successfully ran selftests up until one of the
batteries failed and everything it supplied went down. :-(

It runs with a maximum load of 30%.

I have been contemplating using two full size 60Ah car batteries
externally instead of the small 7Ah internals.

Not the best choice.

I have a SmartUSP 1200 {that's 1200VA in their hype..}. I have used
external batteries for ~10 years. I had two 50AH deep cycle batteries
until they died. Now I have some ~18 AH ones. The 50's would take
days to recharge, but so what?

Car batteries are a poor choice; get deep-cycle batteries.


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