MorningStar TS45

ewarnerusa wrote:
I'd say it is duty cycle. Essentially the inverse of how much clipping the solar controller is doing to prevent the battery from exceeding the charging setpoints. During bulk charging, the duty cycle is 100% because the controller is allowing all of the solar current input to reach the battery. Once your absorption charging setpoint is reached, the controller begins to taper the current by decreasing the duty cycle (increasing the off time of the on/off PWM cycle) so that the absorption setpoint voltage is maintained. This is why you see that number fluctuating. As sun comes and goes and as battery SOC increases, the controller will do what is necessary with the duty cycle to allow the battery voltage to remain at the absorption setpoint. The Trister PWM will transition from absorption to float based on time at or below a preset duty cycle percentage.

This seem to help. I know my battery voltage was at 14.8 volts. As I am not in full sun, I have a tree that is over my panels. So it could be trying to clip the power but with the low output from the panels it could be having a hard time regulating the charging system. I will try to keep an eye on the meter when in full sun and see how it react. Maybe it will smooth out the meter reading. Will update when I have more information. Thanks again everyone for all your help. Gary