I have six 8D AGM batteries in a 730 AH, 24 vdc bank. I've discharged them to 80% based on the Trimetric monitor. So by my thinking I need to put about 155 AH back in to 'top' them off to 100% (73 * 2 * 1.06 = 155 based on 94% efficiency). So, I set my Trace inverter to 15A AC Max charge amps and the absorption time to 3 hours. I estimate that 15A AC should be about 60A DC. So, 155 / 60 = 2.5.

After a full bulk/absorption charge cycle, the Trimetric reads only 93% full.

Obviously, there is something wrong with my math and understanding of battery charging. Can someone help me do the math right? Also, if I vary the Max charge amps, that should raise or lower the required absorption time, but by what factor?

TIA