Frequently when I have a power failure at home it lasts longer than the amount of runtime my UPSes have in them. I always buy 1500VA units which is the largest commercially available that doesn't see like an order of magnitude in higher price.
Can anyone recommend some way to extend the runtime of battery backup systems, preferably without trying to jury-rig car batteries to an existing unit? I understand the implications of doing something like that with respect to the inverter heating up too much, but the idea here is runtime not actual power output. I'd like to, for example, run my modem and router for hours at a low draw. This would also have the effect of not flattening the batteries when they run out which has killed several of mine now.
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