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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Make sure you are using the correct charging profile for the AGM batteries. Charge fully. You will have a surface charge of 13.5 volts. The batteries should settle down to 12.7 or 12.8 volts. Then run the fan or something to see how long they last. My batteries drop to around 12.5 once under load, and then hold there for many hours. Then start dropping to 12.4, 12.3, etc.
When the reading is 12.0 volts, that is 50% discharge. Time to start the genny and charge them back up.
Good luck.
When the reading is 12.0 volts, that is 50% discharge. Time to start the genny and charge them back up.
Good luck.
