MPPT 100/20 Solar Charging Troubleshooting

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mercury63 asked yesterday

MPPT 100/20 Solar Charging Troubleshooting

Having some trouble working out why our solar panels aren't charging.

The MPPT blue LED is flashing roughly once every four seconds with no other LEDs flashing. Not sure where to start with troubleshooting.

Charger off reason in the Victron app reads "Insufficient PV power", which can be caused by insufficient PV panels voltage, loose connections, an external circuit breaker has tripped, or a fuse is blown.

I've checked all of the connections between the MPPT and the panels on the roof and we've replaced the fuses, but still not found a solution.

Any advice on where to start?

MPPT SmartSolar Solar Panel smart solar charging behaviour

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Answer 1 · 2024-07-19T14:54:58Z

Matthias Lange - DE answered · yesterday

Reversed polarity? Disconnect the PV wires and check the polarity.

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Answer 2 · 2024-07-19T16:33:17Z

pwfarnell answered · yesterday

Is this a new install tjat you are having trouble getting to work or an existing install that has developed problems, what panels do you have.

Have you used a multimeter to check the open circuit voltage and short circuit current of your (panels).

If you have panels in series or parallel have you connected them up correctly. Parallel connection all panels +ve connect together to MPPT +ve and all panels -ve connect together to the MPPT -ve. For series, MPPT +ve to first panel +ve, first panel -ve to second panel +ve, second panel -ve to MPPT -ve.

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