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 ...
Forum Discussion
Perhaps a little explanation is needed.
Agree that 12.2 VDC is as low as you want to go. BUT, this is as measured with batteries AT REST-- no charging and no discharging for some period of time.
If you are monitoring voltage UNDER LOAD, it can be lower and still "come back up" to 12.2 when the load is turned off.
A little experience with loads and monitoring the voltage during and after turning off the load will help you with this.
Agree that 12.2 VDC is as low as you want to go. BUT, this is as measured with batteries AT REST-- no charging and no discharging for some period of time.
If you are monitoring voltage UNDER LOAD, it can be lower and still "come back up" to 12.2 when the load is turned off.
A little experience with loads and monitoring the voltage during and after turning off the load will help you with this.
