After an update from V3.13 to V3.15, my MPPT 250/70 Ve.Can only provides power for a short time and then no more.
asked
Where can I find a downgrade procedure and tool for an MPPT solar controller?
In the meantime I have played around with the Victron tools and found the solution myself. The software downgrade only works with Victron Connect if there is no internet connection when starting Victron Connect. Then the file dialog for selecting the firmware also appears when clicking on "manual update". You have to figure that out first ;-)
The firmware ran immediately and without any problems (as before), even without a voltage reset on the battery side.
The only thing is the solar side, which I only switched on again after the downgrade. I had connected the cluster to another controller anyway because of the failure.
I can't help you with your specific question.
Are you certain there are no wiring issues, such as use of ferrules rather than fine strand wire, or loose terminals?
My 250/100 sits in an uninsulated/unvented shipping container and can see ambient temps up to 40°C without a fan, and it's never throttled its output, though I'm only running 3kW on it - about 50% of what it can handle.
The system has been running for a year while I finished building it. I have 7 clusters of 5 cells each on the north-east side of the roof. Based on the maximum individual outputs, I would have expected more than 10kW with the massive solar radiation over the last few days.
Two days ago there was still a layer of cloud in the morning which shielded the radiation. When the sun was already much higher, the cloud layer disappeared and the controllers produced the expected output for about 10 minutes.
Now I have provisionally attached PC fans with adhesive tape and lo and behold:
If you manually download the firmware file from professional.victronenergy.com.
Then on the VRM firmware update page click on the very right of the device on the "upload file" option, this should move it the version you have uploaded.
VC app also has a choose file option, providing you have placed the file on your device.
I had already tried Victron Connect, but when I try a manual update to the downloaded software, I always get the message "The latest version is already installed".
