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mercury63 avatar image
mercury63 asked

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?

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MPPT SmartSolarSolar Panelsmart solar charging behaviour
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2 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

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

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pwfarnell avatar image
pwfarnell answered ·

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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Related Resources

Additional resources still need to be added for this topic

MPPT product page

VictronConnect manual

PWM or MPPT

MPPT calculator

MPPT codes