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...
Forum Discussion
Believe the SG, not the voltage. Read this again that mex posted from Rolls:
"....becomes a major and noticeable problem. This under charge condition is caused when batteries are deficit cycled. The bank receives less of a charge each cycle and starts to sulfate. Eventually, the sulfate will cause a resistance to charge and a “false high voltage” reading will occur. The “false high voltage” is measured by the charge controller, which further lowers the charging current to maintain the voltage set point. This further increases the undercharge condition. This is one reason why specific gravity measurements are so important as “false high voltage” readings can be misleading"
I think those batts are near their end at some lower AH capacity than new, not sure how much lower, but the SG is saying they are at about 75% of rated 150AH My 135AH WAG from the incomplete test run may be too high.
You and you alone have to assess the risk of going camping with them again if they will cause trouble or not, and if you have a work-around if they do.
If you have the height allowance, 6s have the same footprint as those 24s and two 6s will give you more like 225AH instead of 150.
"....becomes a major and noticeable problem. This under charge condition is caused when batteries are deficit cycled. The bank receives less of a charge each cycle and starts to sulfate. Eventually, the sulfate will cause a resistance to charge and a “false high voltage” reading will occur. The “false high voltage” is measured by the charge controller, which further lowers the charging current to maintain the voltage set point. This further increases the undercharge condition. This is one reason why specific gravity measurements are so important as “false high voltage” readings can be misleading"
I think those batts are near their end at some lower AH capacity than new, not sure how much lower, but the SG is saying they are at about 75% of rated 150AH My 135AH WAG from the incomplete test run may be too high.
You and you alone have to assess the risk of going camping with them again if they will cause trouble or not, and if you have a work-around if they do.
If you have the height allowance, 6s have the same footprint as those 24s and two 6s will give you more like 225AH instead of 150.
