> Given that batteries used in backup service rarely get cycled at all,
> wouldn't car batteries be a more cost-effective choice? (assuming the
gel
> cels were not a gift)
What's your replacement and disposal costs?
Car batteries and marine deep cycle batteries aren't that different in
price, and the deep cycle batteries are MUCH better at tolerating deep
discharges.
I don't know the number offhand, and I'm sure it varies a bit, but some
small number of discharges to 10V will kill a car battery.
There is progressive damage with this, so after the first deep
discharge the battery has less capacity, and it gets worse with every
discharge.
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