For two month the MPPT450/200 worked flawlessly. Since the day before yesterday this MPPT is not getting any power from the solar panels anymore. All channels show 0 V and 0A. I don’t know if I did something wrong or if it’s a warranty thing.
What I did:
Next thing I checked was if i could find anything in cabling.
If I switched off the circuit breakers I have Voltage coming from the Panels.
Then I checked the safety relays, they are in the not OK position (even for the MC4s which are not connected at all) for which I’d assume they tripped and shorted the panels:
The only thing that may help is the time at which this occured, it was in the morning at startup, so the power was not too high and also the batteries had also plenty of space left after the night.
@gkoer What is the specification of the solar panels and how many per string? Also show a graph of voltages per string when it happened (in detailed view by clicking on cog and enabling it) Have you isolated the system and checked all fuses/switches between mppt and batteries? Please post image of these too. PS - These safety relays cannot be reset as per the manual due to possible internal failure, so it may be necessary to return the unit to the dealer after carrying out the pre rma checks. The root cause still has to be determined and you have to ensure your installation is sound.
Hi,
Thanks for your reply.
I’m using 2 Strings with 8 Panels and one string with 9 Pannels of Aiko Neostar 2P+ with 470 W they have a open voltage of 41.18 V for each pannel. It was not even pretty cold (around 10 degree) outside.
Here are the requested string voltages with max enabled:
As of now I used 2x125A NH-Fuses I didn’t check them explicitly, since the MPPT in itself can be accessed powered from battery both with bluetooth and VECAN.
But I’ll check that today in the evening and also check the pre rma.
What’s strange to me is that there is not a log or errormessage of any sort.
All is within the operating limits. Looks like it has barely reached the startup voltage of 120V? Worth looking into the string voltages and measuring it to ensure the system will actually start.
