Hi,
im writing this here, because my repaire center in germany was very unhelpful and i did not find any way to contact victron support directly.
One of my MPPTs has an insulation fault (i think that). It has PV voltage between the cooling fins grounding point and the negative battery terminal.
The fault is better decribed in this topic: MPPT250 70 PV voltage on cooling fins grounding point - #3 by NicoB
I sent the two year old unit to my repair center.
They responded, that corrosion is not covered by warranty and they will send the unit back to me.
They say, that corrosion is not just on the mounting holes but also over the contacts on the pcb and that caused the isolation fault in the MPPT.
How can this MPPT be corroded on the inside? It is mounted in a dry basement room and none of the other devices show any sign of corrosion. Everything is dry and clean.
The MPPT shows corrosion an the mounting holes, where it was screwed to the concrete wall.
But only there. What i can see through the gaps of the housing the pcb is completely clean.
How can they even know there is corrosion inside? It is not possible to disassemble the unit.
For me this looks like galvanic corrosion because there was some current going through the screws into the wall. The crews were almost completely corroded away. (The grounding wire was not connected) So the corrosion is caused by the insulation fault, not the other way arround. This should be covered by warranty.
What should i do now? Just buy another 400€ mppt, mount it on the same spot and hope for the best?
I am quite frustrated because there is no clear reason why this happened and because the repair center has no interest in helping me with finding the real problem.