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ghostrider avatar image

MPPT Fault #21 & negative amps

Have been running my MPPT 100/20 for about 1.5 years without issue on my travel trailer. We are out on a trip now & I noticed one morning no charging & a fault #21.

I unplugged everything & replugged...worked fine. Next morning...same thing but went back to fault some time during the day...then I reset again... next morning no fault but was seeing battery bounce between negative amps & 0 at the MPPT battery with a bulk charge. When I disable charger (off state) & re-enable, it faults. Wont charge at all now.

Thankfully I'm at a plug in site for a week so don't need solar...but whats going on? Faulty MPPT?

MPPT - Solar Charge Controllercharge controller errorfault
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Alexandra avatar image
Alexandra answered ·

@Ghostrider

https://www.victronenergy.com/live/mppt-error-codes#err_21_-_current_sensor_issue

I think if you follow the troubleshooting tips and it keeps reoccurring, then yes it has developed a problem, it would need to be taken to a dealer.


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