Automatic, smart battery charger?
I would like to hear some comments and suggestions. In July 2017, I made some progress on understanding the settings in the MS SS MPPT 15L solar controller. I then modified several settings which ...
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I ran a little test today to see what would be the maximum solar Amps as the sun is low. I am prepping for an Alaska drive-about.
Here you see the daytime process as read from the controller each minute. During bulk the battery Volts slowly rise to the Abs setpoint, then Volts hold for one hour, then switch to the float setpoint. Just before Noon I switch on a 500W inverter load. The battery Volts drop immediately and the controller switches back to bulk.
Here you see the same time frame with attention given to Amps. The controller transitions from bulk to abs at 5.5A to float at 3A. As soon as the 500W load is invoked, the controller collects the maximum Amps commensurate with the insolation. It is a clear day. At 12:30 solar Noon, the Amps top out at 10.5 and begin to decline.
HTH;
John
Here you see the daytime process as read from the controller each minute. During bulk the battery Volts slowly rise to the Abs setpoint, then Volts hold for one hour, then switch to the float setpoint. Just before Noon I switch on a 500W inverter load. The battery Volts drop immediately and the controller switches back to bulk.
Here you see the same time frame with attention given to Amps. The controller transitions from bulk to abs at 5.5A to float at 3A. As soon as the 500W load is invoked, the controller collects the maximum Amps commensurate with the insolation. It is a clear day. At 12:30 solar Noon, the Amps top out at 10.5 and begin to decline.
HTH;
John
