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 am working with the definition of a topped-off battery is "...when a low point of Amps is reached and held for 15 minutes during Abs.". I became weary while waiting for days to see the charge Amps flatten out at a low Amps. Weather was not cooperating.
Last night I used garage/shore power to run the 50A Magnum inverter/charger. I wanted the next day to begin with a fully floated bank.
It is a clear sunny day. In this graph you see the Magnum maintaining 14V Float Voltage until sunrise. Did I say I use temp-comp chargers? I ran the Magnum from 4PM to 8AM. By 9 the MPPT was holding the V-batt at 15V and Amps were steady at ~1.68A. The Target Volts smothers the V-batt.
This exceeds the top-off rule of thumb, and we are ready for the MPPT to Float.
Parasitic draws are:
Magnum on standby
2 x Dometic 12V CF-35 fridges
12V to USB adapter
Raspberry Pi 3 B
HTH;
John
Last night I used garage/shore power to run the 50A Magnum inverter/charger. I wanted the next day to begin with a fully floated bank.
It is a clear sunny day. In this graph you see the Magnum maintaining 14V Float Voltage until sunrise. Did I say I use temp-comp chargers? I ran the Magnum from 4PM to 8AM. By 9 the MPPT was holding the V-batt at 15V and Amps were steady at ~1.68A. The Target Volts smothers the V-batt.
This exceeds the top-off rule of thumb, and we are ready for the MPPT to Float.
Parasitic draws are:
Magnum on standby
2 x Dometic 12V CF-35 fridges
12V to USB adapter
Raspberry Pi 3 B
HTH;
John
