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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Here are an interesting two graphs that show a difference between parallel and series connected 12V panels with MPPT. I have a TT and a van in the driveway. Both have their own panel arrays and they have been subjected to the same weather.
This morning, I was greeted with the fifth consecutive day of inclement weather. It was dense fog followed by rain and then complete overcast. We had freezing rain for 3 days beforehand and the panels were covered with ice until yesterday with about half covered overnight.
First, the series graph of the van.
You see V-Array, or solar Volts, beginning at 13V and the controller in Bulk. Next V-Array rises until the sky darkens and the rain begins where the V-Array drops back to 13V. After the rain passes, the V-Array rises to 32V where we see some more Amps.
Second, the parallel graph of the TT.
Here you see what happens when the V-Array Volts are cut in half due to the parallel setup. Charging starts out as above, but when the rain began the V-Array dropped low enough that the controller went into NIGHT/DISCONNECTED mode. Once the V-Array rose back to 13V the controller reverted to Bulk mode.
Comments?
HTH;
John
This morning, I was greeted with the fifth consecutive day of inclement weather. It was dense fog followed by rain and then complete overcast. We had freezing rain for 3 days beforehand and the panels were covered with ice until yesterday with about half covered overnight.
First, the series graph of the van.
You see V-Array, or solar Volts, beginning at 13V and the controller in Bulk. Next V-Array rises until the sky darkens and the rain begins where the V-Array drops back to 13V. After the rain passes, the V-Array rises to 32V where we see some more Amps.
Second, the parallel graph of the TT.
Here you see what happens when the V-Array Volts are cut in half due to the parallel setup. Charging starts out as above, but when the rain began the V-Array dropped low enough that the controller went into NIGHT/DISCONNECTED mode. Once the V-Array rose back to 13V the controller reverted to Bulk mode.
Comments?
HTH;
John
