Here in northern NJ, we lose power a few days a year. Some years we'll
have a storm that knocks out power for two or three days. After
Hurricane Sandy we lost power for ten or eleven days.
Obviously the cost of the lost power is negligible, even at PSE&G's 17.5
cents per kWhr. That doesn't enter into the battery backup calculation
at all.
It's not money that drives the decision - it's convenience.
At the moment, we have a few deep-discharge marine batteries and
standalone pure-sine inverters (300W to 1500W) to power a few lamps, the
refrigerator, the cable modem up, and to charge the cell phones and
laptops. But during Sandy I had to borrow batteries out of my Jetta EV
conversion.
All of that did the job, but I missed the battery backup system's
seamless switchover, the freedom from concern about batteries going
dead, the bother of manual charging, and the drudge of moving batteries
and inverters from room to room.
Len Moskowitz
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