Fred n Sandy wrote:
On Friday 24 October 2014, Christopher Myers wrote:
(I had to tweak the float voltage on my APC SU700a because it was running too high of a float voltage, and was killing my batteries off too quickly.)
Yeah, there is that. Gel cells typically run a bit lower float than auto batteries, so my thought is that putting a wet cell in place of a gel cell doesn't hurt anything... if anything, it may not keep the wet cell at its optimum voltage and the capacity will be ever so slightly reduced but the effect is minimal
Especially since they have much more capacity than the small gel cells used in most household UPS devices -- even at only 50% charge, they should still have more capacity than a brand new sealed gel cell. And since automotive batteries can typically be obtained from junk yards for only a few dollars (they're happy to get rid of a heavy hazardous material item that has very low scrap value), it's a no brainer to get a couple. Buy 3 from a junkyard and you could still be at under $10 investment for the batteries themselves -- buying lugs will probably be cheaper than used batteries from a junk yard.
Fred
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