Determining AH rating of aging batteries
My Trojan 125's are almost 5 years old now, when they were new they were rated at 240 Ah. Now my trimetric is showing 70% at 12.1 volts which I know is wrong. So how can I determine the true Ah rati...
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Mex, none of the old transformer type chargers I had had any way to crank up charging voltage to 15 volts.
Barry, do I measure the weakest cell till it's at the half SG? It's almost there after drawing 12 amps for 9 hours, voltage on the trimetric is still showing 11.9 volts (with the load on). Maybe equalizing it before starting the test bumped things up to where they should be? Doesn't seem to last though..?
I'm really not feeling like this test is doing me much good. (probly cuz I'm not really sure what I'm doing.) I might just try setting the trimeteric to show I'm starting at 200 Ah and see how that goes our next trip.
What should my trimeteric voltage be at 50%, 12.2V?
Barry, do I measure the weakest cell till it's at the half SG? It's almost there after drawing 12 amps for 9 hours, voltage on the trimetric is still showing 11.9 volts (with the load on). Maybe equalizing it before starting the test bumped things up to where they should be? Doesn't seem to last though..?
I'm really not feeling like this test is doing me much good. (probly cuz I'm not really sure what I'm doing.) I might just try setting the trimeteric to show I'm starting at 200 Ah and see how that goes our next trip.
What should my trimeteric voltage be at 50%, 12.2V?
