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SOLAR PANEL DOES NOT ENGAGE WITH SOLAR CONTROLLER

I have a caravan - 2 x AGM 105aH batteries. I have rooftop solar panels (200 watt) connected to Victron Smart 100/20 Solar Controller. Works fine - I have Volts and Amps showing on my Bluetooth App. I have separate Andersen Plug outside van for Portable Panels. I have 120 watt panels connected to separate Victron Smart Controller. App shows Volts - but no Watts and No Amps. Message on App says Controller is off - not working. I've checked the wires etc - all OK. Cannot work out why Controller does not work !
Any suggestions appreciated.

mppt smart solar
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Sounds like a blown fuse in the bottom of the mppt.


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