RV Voltages too high while charging
I have a problem and have been wrapping my head around this for a few days. I have four 100w Solar panels, and a Morningstar RJ-45 programmable charge controller wired to batteries. I have Four In...
Forum Discussion
It is a fake "issue." The "normal" definition of "absorption voltage" is the Vabs that you get the batts to before holding it there while amps then taper during the absorption stage.
Somehow, as was mentioned above, the Interstate specs have mixed up "Absorption" with "Finish" , which itself is a sort of term for "Top Charging" as Mex uses that term, and "Overcharging" which others use for the same sort of thing.
Ignore all that, and just set your Vabs to 14.8v. Every so often do an overcharge. Check your SG after the overcharge. If not to "Baseline SG after that, then do another overcharge. Once you get to Baseline SG you can go back to regular routine for another month or so.
It is true that if you can do say 75-95s on solar every day, you will not need overcharges so often to hit baseline SG as when doing 50-90s. If you can only do 50-90s successively, you will have a hard time with "progressive sulfation" reducing your battery capacity, and you will need an overcharge more often than once a month to keep up.
The really hard part is howinheck can you do an overcharge when on solar. You need the batteries to be "full" before you can do an overcharge, and the best you can do every day is to get them almost full. Bummer!
Split the bank. If you have two 12s or four 6s, then take half of the bank off the rig draw and just charge that half up to full and then do its overcharge and "get them clean." Then put them on-line and next sunny day do the other half while running the rig on the other half that has already been done.
If your controller does not have an equalize setting, then just by- pass it and go "panel direct" to do the overcharge.
Somehow, as was mentioned above, the Interstate specs have mixed up "Absorption" with "Finish" , which itself is a sort of term for "Top Charging" as Mex uses that term, and "Overcharging" which others use for the same sort of thing.
Ignore all that, and just set your Vabs to 14.8v. Every so often do an overcharge. Check your SG after the overcharge. If not to "Baseline SG after that, then do another overcharge. Once you get to Baseline SG you can go back to regular routine for another month or so.
It is true that if you can do say 75-95s on solar every day, you will not need overcharges so often to hit baseline SG as when doing 50-90s. If you can only do 50-90s successively, you will have a hard time with "progressive sulfation" reducing your battery capacity, and you will need an overcharge more often than once a month to keep up.
The really hard part is howinheck can you do an overcharge when on solar. You need the batteries to be "full" before you can do an overcharge, and the best you can do every day is to get them almost full. Bummer!
Split the bank. If you have two 12s or four 6s, then take half of the bank off the rig draw and just charge that half up to full and then do its overcharge and "get them clean." Then put them on-line and next sunny day do the other half while running the rig on the other half that has already been done.
If your controller does not have an equalize setting, then just by- pass it and go "panel direct" to do the overcharge.
