Inverter settings resetting by themselves

aaronuu · Mon Sep 15, 2025 2:53 pm

Hello,

I have a KH10 inverter with an EQ4800-L9 battery stack. I have connected my inverter to my home assistant via the modbus integration, but I am having trouble getting settings to "stick". This is only happening for the "Export limit" setting at the moment, but when I use the "write registers" action to update the export limit to 0w it changes back almost immediately to the default of 5000w.

This has only started happening recently, in the last couple of days. For the last month that I've had my system it was working as intended, the setting was applying and staying active until I changed it. I have not changed anything within my automations. I asked my installer if they knew what could be going wrong and they have no idea, they said they don't have access to my system for updates, so it doesn't sound like it's a new firmware update or whatever.

I did a hard reset on my system today which fixed the issue for about 3 hours, but after that it just started happening again, changing the export limit over and over as my automations tried to fight with whatever is changing the setting back.

Can anybody help with this issue? I have no idea what could be causing it.

Thanks

WyndStryke · Mon Sep 15, 2025 3:59 pm

Superficially, it sounds like it is being set from the cloud, and that's overwriting your modbus settings.

What are you trying to achieve by setting the export limit to 0W, complete self-use with no export?

aaronuu · Mon Sep 15, 2025 4:23 pm

So I also tried using the API to set the export limit, which had the same effect. It changed the limit for a few minutes, then reset itself again.

I want to turn off my solar export when my feed in price is negative, otherwise I have to pay my provider for exports. Having an export limit set to a static 5000w costs me money.

It does certainly sound like it's being set by some automated system that thinks my export limit should always be 5000w no matter what. I don't really understand why it only kicked in a few days ago when it had been working how I wanted for a month.

WyndStryke · Mon Sep 15, 2025 5:13 pm

Instead of setting the export limit, can you set the workmode to Self-Use (also making sure you have sufficient space in the battery, perhaps by automatically force-exporting prior to that point?). In that mode, it'll only export if the battery is full.

aaronuu · Tue Sep 16, 2025 1:11 am

No that won't really work, generally on a sunny day I will have negative export pricing from about 10am to 4pm, my battery starts the day at 20% so there isn't opportunity to discharge it any further. When it's done filling by 1-2pm there is still a few hours where I have excess solar that I may not want to export.

If the import price is also negative at this point then I can force discharge at 0.01kw which curtails the solar and forces me to import from the grid, but in the case where the export price is negative and the import price is positive I want to stop exporting, but use my solar for the house load instead of buying from the grid.

I just want to be in control of my own inverter...

WyndStryke · Tue Sep 16, 2025 1:26 am

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my battery starts the day at 20% so there isn't opportunity to discharge it any further.

Only a small improvement, but you could drop the min soc to 10% instead of 20%, and make sure it's at that level just before the negative export pricing starts. That'd be another 3.8kWh or so.

It should be possible to turn off production, I just don't know how (it's not really a requirement here!). There are a few threads about Australian installs, VPP and suchlike. Might be worth posting there if you haven't already done so. viewtopic.php?p=8830#p8830

aaronuu · Tue Sep 16, 2025 2:22 am

Thanks WyndStryke, I've spoken to fox support and they don't know what's going on either, but your link gave me a hint about what I think is going on.

It seems pretty likely that it's the DRM (demand response mode) where the grid is actually pushing signals to my inverter and resetting the export limit. I have no idea why they would be wanting me to export more energy when the demand is low and generation is already high. I also have no idea who is actually in control of sending those signals, and how to get in contact with them. It kind of looks like I'm out of luck here, possibly just waiting until hopefully they stop sending signals to my inverter.

Appreciate the help and suggestions.

Tue Sep 23, 2025 7:00 pm

You can test this by disabling DRM and see if the setting continues to change.

aaronuu · Wed Sep 24, 2025 12:02 am

Will wrote: ↑Tue Sep 23, 2025 7:00 pm You can test this by disabling DRM and see if the setting continues to change.

Hi Will, yeah I did end up testing that and it didn't work. The only thing that got the setting to stop changing was blocking my inverter from the internet.

WyndStryke · Wed Sep 24, 2025 9:22 am

I wonder if there is a schedule running via the cloud (either the mode scheduler, or the charging slots).

jammin · Mon Oct 13, 2025 3:01 am

Did you manage to resolve this issue?

aaronuu · Mon Oct 13, 2025 3:16 am

jammin wrote: ↑Mon Oct 13, 2025 3:01 am Did you manage to resolve this issue?

No, Fox support was alright and they tried to diagnose it but couldn't figure it out.

I ended up just blocking my inverter from the internet, which is a bit of a band-aid but it works for now. I'll just need to re-enable it to get firmware updates.