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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Get the battery as full as you can get it and note the SG. Now disconnect form shore power and solar, and run a 20 hr rate load. This will be 5 amps for a 100AH battery, eg. or 4 amps for an 80AH battery. One light is 3 amps, two is 6 amps. Or a 50w bulb in an inverter draws 5 amps.
Run that for ten hours or until you get to 50% SOC (1.200 ish on the hydrometer) Voltage will be 11.x. Remove load, let voltage bounce back. If you were at 50% it should climb back to 12.15 or so in a few hours.
So if it took only 8 hours to get there you have capacity of 80% of rated. Or whatever your results are. That's where you are at. An AH counter is confirmation.
If you only take 6 hours to get to 50% then you will know the horrible truth about what you have now. Do the test in your yard at home instead of going camping and finding out the hard way.
Im going to try that. Ill let you know the results in a few days..
So 150ah.. 2x75ah batts Thats 7.5 amps in 10 hours should net 50%
