27DCs and SG Lag Problems
Here is what I mean. Got two rebuilt 27DCs from Interstate as "Econo Power" models, which means they are whatever brand and type they decided to renew and sell at under half price. So just right fo...
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I went through this on the screwy 31.
Long version short I bumped up Absorption voltage and duration. Absorption to 14.9 then a float of 15.3 for the rest of the afternoon while the sun shined.
With plug in charging sources of higher amperages applied at the lowest state of chagre the Absorption voltage and duration could be lower, somewhat
Even with that excessive regimen the SG still walked down and after 15 cycles a 16v EQ charge was required for 50 minutes.
At about deep cycle number 500 during an EQ one of the cells bottoms was 10 degrees hoter than the rest of the battery and I removed it from my rig in june 2015
it still lives, but is only shallowly cycled. it has had its plates exposed as my 'smart' schumacher has an affinity for 16+ volts, but will still hold 12.82v 12 hours off the charging source.
Flooded group 24/27/31s are, in my opinion, poor at recovering from deep cycling without excessive voltages and durations at which they are held, and regular EQ charges.
And 14.4v is not enough for them.
Long version short I bumped up Absorption voltage and duration. Absorption to 14.9 then a float of 15.3 for the rest of the afternoon while the sun shined.
With plug in charging sources of higher amperages applied at the lowest state of chagre the Absorption voltage and duration could be lower, somewhat
Even with that excessive regimen the SG still walked down and after 15 cycles a 16v EQ charge was required for 50 minutes.
At about deep cycle number 500 during an EQ one of the cells bottoms was 10 degrees hoter than the rest of the battery and I removed it from my rig in june 2015
it still lives, but is only shallowly cycled. it has had its plates exposed as my 'smart' schumacher has an affinity for 16+ volts, but will still hold 12.82v 12 hours off the charging source.
Flooded group 24/27/31s are, in my opinion, poor at recovering from deep cycling without excessive voltages and durations at which they are held, and regular EQ charges.
And 14.4v is not enough for them.
