Lifeline Battery Recovery experiences?
I had a thread about our Magnum MS2812 going into Fault code mode overnight while boon docking. Posted under Magnum because I first thought I may have had a problem with my program parameters, and pos...
Forum Discussion
Seem to be confusing temp adjusted voltage with charging efficiency adjustment.
Say there is a 5% heat loss when charging a battery. You run the charger till the AH counter says 100AH has gone in. But you only restored 95AH of that to the battery, the other 5 AH went to heat loss.
If your "full" 100% SOC is 800AH, and you start at 50% SOC at 400AH, then your counter will say "full" when it has done 400AH, but in fact you have only restored 380AH, so you are at 400+380 = 780/800 = 97.5% SOC.
Do that several times and it just gets worse and worse.
Perhaps the Magnum monitor does have a default charging efficiency set in, I don't know. The Trimetric does, but it is a WAG for "typical" and you still get out of whack unless you do some work with it--which is great for a stable situation like with a stick house, but not so good with an RV on the move.
You need to put the Magnum ammeter on the batts and charge them at 14.4v ( whatever the battery spec says), and watch for the amps to drop to near zero. (no load) Now they are as full as they can be at whatever condition they are in wrt sulfation. Now you reset the AH counter to zero.
And now you can do a discharge as usual, until you get down to where the "morning voltage" (more or less resting--no furnace and no solar yet) is 12.2ish.
What does the AH counter say? That is about half your real capacity. (There is no percentage loss on the discharge, so the AH count is real on a discharge, just not on a recharge)
Say there is a 5% heat loss when charging a battery. You run the charger till the AH counter says 100AH has gone in. But you only restored 95AH of that to the battery, the other 5 AH went to heat loss.
If your "full" 100% SOC is 800AH, and you start at 50% SOC at 400AH, then your counter will say "full" when it has done 400AH, but in fact you have only restored 380AH, so you are at 400+380 = 780/800 = 97.5% SOC.
Do that several times and it just gets worse and worse.
Perhaps the Magnum monitor does have a default charging efficiency set in, I don't know. The Trimetric does, but it is a WAG for "typical" and you still get out of whack unless you do some work with it--which is great for a stable situation like with a stick house, but not so good with an RV on the move.
You need to put the Magnum ammeter on the batts and charge them at 14.4v ( whatever the battery spec says), and watch for the amps to drop to near zero. (no load) Now they are as full as they can be at whatever condition they are in wrt sulfation. Now you reset the AH counter to zero.
And now you can do a discharge as usual, until you get down to where the "morning voltage" (more or less resting--no furnace and no solar yet) is 12.2ish.
What does the AH counter say? That is about half your real capacity. (There is no percentage loss on the discharge, so the AH count is real on a discharge, just not on a recharge)
