If I understand your measurement correctly, R_bat = delta V / delta I = 0.07V/8A = 8.75 mohm. That's what we should be expecting when battery is thirsty.
Looking at the SOC graph, we can get an understanding of battery resistance vs. SOC.
Using the C/5 and C/10 curves, with C = 100AH, we get:
70% SOC: R = 0.3V/10A = 30 mohm
80% SOC: R = 0.4V/10A = 40 mohm
90% SOC: R = 1.4V/10A = 140 mohm
If battery bank is larger than 100AH, (for example 200AH), then resistance reduces by ratio 100AH/200AH, or by 1/2.
Sal
BFL13 wrote:
DC panel meter- 12.96, goes to 12.89, back up. Change in net amps on Trimetric was 8.0a
