Sungrow SH10RT-V112 reboots sometimes without particular reason

[Alex-PB31]

Hello everyone,
I implemented the "Sungrow-SHx-Inverter-Modbus-Home-Assistant" several months ago successfully - I can monitor all values of the inverter and the battery.
Unfortunately, sometimes (2-4 weeks) the inverter reboots without any particular reason, the power is interrupted for around 5 minutes, if the inverter is back, everything works as before.
So, I'm currently not sure, if this tool is the reason for this behaviour - have any of you had similar experiences?
To avoid any influence of the application, I deactivated the addon in the HA and now I’m waiting if the inverter restarts again within the next few weeks. Any better ideas?

My Inverter: SH10RT-V112
My Battery: SBR096
Wired connection via inverter LAN port

The wallbox is also connected to my HA and controlled with EVCC - during the last power outages, no vehicle was connected to the wallbox.

All the best,
Alexander

[Gnarfoz]

You mention power being interrupted while the inverter restarts, does that mean you have all of your loads connected to the backup port of the inverter?
That's not a recommended setup for the SHxRT series even though it can be done if you make sure not to overload it. Which might be the case here.

Apart from some weird interaction with running states flapping back and forth during startup, causing one of the automations to tell the inverter to shut down while it was starting up, there's no reason to assume this integration is causing the restarts. You could check in Home Assistant's log book or in the automations' traces to see if any of them triggered close to when the problem occurs.

Bonus: if you have evcc and Home Assistant accessing the inverter at the same time, it's a good idea to use a Modbus proxy to avoid making the not-so-great Modbus stack on the inverter mad. Evcc includes one, I think. However, this doesn't cause restarts. The Modbus interface just stops responding and it can be fixed by unplugging the network cable for a minute or so.

[Alex-PB31]

Hello, thanks for your reply,

Regarding the overload, you are right, that was a problem directly after the commissioning of our photovoltaic system, but it was checked and solved by the responsible electrician.

Only parts of the house installation were affected by the power outages.

I'm currently using an modbus proxy separately installed in the HA to reduce the load of the inverter modbus.
I'll take a closer look at the HA log to see if I can find any information about the time of the last partial power outage - I didn't find anything special last time.

Thanks for your support!

[Gnarfoz]

I'd focus on the electrical circuits that are connected to the backup port. Do you know which ones they are? And can the loads on the circuits exceed the limits of the backup port? As per the manual: 18.5 A or ~4.2 kW per phase at 230 V. It's easier than one might think. My (tiny) dishwasher during its heating cycle (~2.1 kW) and water kettle (~2.2 kW) would already be enough to do that, if they were connected to the same circuit...

[Alex-PB31]

I informed the electrician, he's going to open a Sungrow ticket, because there are also no hints in the inverter logfiles.
Regarding the high load on the backup port, before the latest outage, just the coocer was switched on, no dishwasher, no washing machine, no kettle, no clothes dryer...
So that’s why my last guess was therefore the possibility that a conflict between the EMS of the HA and the control of the inverter led to a reboot.
I hope to find a solution, my wife is getting angry 🙄

[Gnarfoz]

There is no EMS in HA, that's a misconception. This project only adjusts parameters used by the EMS in the inverter.