Greetings.
I have a small system consisting of the following components:
- Victron 100/20 MPPT (FW V1.61)
- VictronSmart Shunt
- 12V Battery bank with 4 x 100Ah LiFePO4 batteries
- 380W PV Panel
- All connected via Victron Lynx Distributor and battery isolator
My current findings:
- Open Circuit voltage on PV : 39.5V (Measured at the connection point and at the controller)
- Solar voltage on MPPT SmartConnect correlates to measurement.
- Battery absorption Voltage set to 14.4V as per manufacturer.
- Voltage measured on battery terminals : 13.1V
- Voltage measured on the Batt. terminals @ MPPT : 13.1V
- Voltage reading on SmartShunt app : 13.1V
- Battery Voltage reading on MPPT SmartConnect App : 14.39V
- All voltage readings were taken with the PV connected.
- The controller stays in absorption mode, with 0.0A applied to charging.
My questions:
1) Could my battery bank size be too much for the MPPT charge controller?
2) Why the voltage difference between the terminals and the app? Am I perhaps missing a reference GND?
It thus appears that there is no output voltage on the charge controller and I am measuring the battery voltage at that terminal. Typing this, I have not checked for a fuse on the controller (dumb I know), but is it possible that the output on the controller would be fuse protected?
