My Inverter stopped!

3.6KW Gen 2, 911 firmware, 11 x Trina 425W on one string. It's been working fine for weeks, but today is the first proper sunny day with this firmware.

At around 1645 today it stopped PV generation, stopped discharging the 100% full battery to fulfil house load, and also appeared to stop reading house load and grid import from the EM115. Full sun and about 3.6KW potential generation.

It was still uploading data to portal, and responded to a "Restart Inverter" from portal which brought it back to life fully @1715

My best guess looking at the inverter data logs is that once the battery is full and the PV power is over 3.6KW is starts to derate the output to restrict power. This in turn increases the string voltage over 500V, at which point it briefly switches off the PV. After a couple of these 'incidents' it seemed to switch off PV and battery discharge permanently.

The V2 inverter spec has MPPT range up to 550V, so I've no idea why 500V seems to be the trigger point. Can @TheDragon (GivEnergy) or someone else advise, or take a look, please?

I have been seeing very similar behaviour since my system was installed in July. I have contacted Support on each occasion and sometimes restarting the inverter has solved the problem. But it's always when the battery is at 100% and when generation is above 500V. I have 14 panels on the west string and 10 east.
Support said that this is a known issue and that a firmware upgrade is in beta test and should be available soon.
See attached example
[upl-image
-preview url=https://givenergy-community-forum-uploads.s3.eu-west-2.amazonaws.com/2023-08-20/1692562468-580923-screenshot-2023-08-16-at-203846.png]

downfield Support said that this is a known issue and that a firmware upgrade is in beta test and should be available soon.

Thanks, I'll try giving them a call. My first thought was grid overvoltage, as it's generally running close to 250V, but the data trace for that doesn't show a problem.

Over the past 4 days, I've had this issue due to grid overvoltage causing the system to shut down for safety reasons.
The peak voltage so far has been 259 Volts.

A system reboot is required to get it to start again

downfield The 500v issue is known, we are testing the fix on a Gen3 at the moment

TheDragon (GivEnergy) Thanks. If you need a Gen 2 beta site let me know 🙂

Afraid-of-Sunlight The peak voltage so far has been 259 Volts.

Our transformer tap change is booked for next week, so that should sort our grid over-voltage problems.

500V issue? Holy sh1t. Really?

Roberto Solar DC, not grid AC. 🙂

Woodstock 🤣

My inverter has stopped a few times since being on 911, same symptoms as described. A re-start fixes the issue most times.
My installation has two strings though, around 210v each so not the 500v issue