How to choose new 8D house batteries.
Existing batteries are 5 yrs old 8D AGM's. after only running my ceiling fan for an hour or two they're discharged down to 12.5V from 13.5. I'm guessing they are nearing the end of their lifespan.How ...
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12.6 is Fully Charged anyting over 13 is a surface charge left over from the converter running and should self dissapate in a matter of minutes.
So I'd say your batteries are still good.
That said you might wish (Depending on the physical dimensions) to consider ging to six volt pairs.. TWO REASONS
1: Cost: They tend to be cheaper than an 8D
2: Wrangling (Wresteling them in and out) each battery is about half the weight of the 8D
Power storage capacity is dang near identical so not a consideration.
NOTE: 8d is one of the reaons I cringe when somneone ask "Which is better Two 12's or 2 6's If the 12's are 8d.. well than that's it (2 8D = 4 GC-2)
