Confusion on battery charging
I am confused about the best practices for charging batteries. For 7 years I had 300 AH of Lifeline AGM batteries, 270 watts of solar and a simple charging system. My old camper has a 110 volt c...
Forum Discussion
"had dropped to 4. Between 2:30 and 3:00 it was mostly cloudy and afterwards the amps needed to absorption went up to 7. For the next 1 1/2 hours I had full solar and stayed at absorption. Amps dropped to 2.9. At 6:30 I was still at 2.9 and then lost light "
So from 4:30 to 6:30 amps stayed at 2.9? The sun was getting lower all that time so amps should have gone down in that two hours.
If the batts were actually full at 4:30, and you had a steady 2.9a draw that the solar could still manage with the available light, that might explain it.
Or say your display reads 2.9a "over" ?
Is there a way to calibrate the amps reading? ISTR one of the remotes from some brand did a calculated amps from some formula it used instead of taking a real amps measurement, and that gave a wrong amps number.
EDIT--it says they show the resting voltage about four hours after being disconnected. So in the late afternoon, disconnect one battery and run the rig on the other. Check the resting battery's voltage four hours later to see how far along it got. If it is 13.0v at 77F, it is full.
So from 4:30 to 6:30 amps stayed at 2.9? The sun was getting lower all that time so amps should have gone down in that two hours.
If the batts were actually full at 4:30, and you had a steady 2.9a draw that the solar could still manage with the available light, that might explain it.
Or say your display reads 2.9a "over" ?
Is there a way to calibrate the amps reading? ISTR one of the remotes from some brand did a calculated amps from some formula it used instead of taking a real amps measurement, and that gave a wrong amps number.
EDIT--it says they show the resting voltage about four hours after being disconnected. So in the late afternoon, disconnect one battery and run the rig on the other. Check the resting battery's voltage four hours later to see how far along it got. If it is 13.0v at 77F, it is full.
