Solax Gen 4 inverter integration & operation

[JamesPett]

Have been trying to build a HA instance supporting Predbat to operate my Solax G4 inverter + storage batteries and have got most of the sensors and controls sorted, but there is one which Predbat seems to want, but I cannot locate in the Solax Inverter Modbus integration (https://github.com/wills106/homeassistant-solax-modbus) :

Predbat is asking for charge_discharge_update_button but I cannot locate this.

Is this needed? For what?

It seems to that the Solax Inverter Modbus integration does not have a "button" for submitting the updates to settings; there are various settings which are changed via drop-down or keyboard entry and I can confirm (via the Solax Cloud app) that they effect changes. So I'm wondering if there is a different way to set up the "apps" in Predbat to control the setting of the charge/discharge times, etc. in the Solax Inverter?

[TCWORLD]

Have you come across the #259 issue thread?

I put a guide to setting it up, using either the Mode1 remote control (#259 (comment)) or the newer Model 8 option (#259 (comment)). Both should work with the SolaX gen 4 inverters. The config lists the names of each sensor required (as well as how to make a missing load sensor).
Could you give one or the other a go and let me know if there are any issues.

[TCWORLD]

Could you try running the script manually? That will tell you whether its in the Solax integration, Predbat itself, or in the service API.

You can run the script from HA by going here https://my.home-assistant.io/redirect/scripts/, then click on script. Try "Force Charge", "Force Discharge", and "Disabled" options and see if the inverter correctly reacts (you should see the battery charge rate change to the set values hopefully). If that works it's possibly something in Predbat.

[JamesPett]

So unless I'm doing something wrong, none of these options seem to have any effect whatsoever.
I've also tried setting a "manual force charge" via the Predbat which seems to have also had no effect.
Clearly I have something wrong! Aaagh!

[JamesPett]

I can though confirm that direct use of the Solax inverter controls DOES work. I changed the setting for "charge&discharge period2" via the "configuration" settings (part of the integration screen in HA) and I see the change immediately reflected in the Solax Cloud app.
So is something wrong with the script?
I also note that there are several "controls" which are "disabled", but could be "enabled" via drop down settings. I wonder whether this is incorrect or whether the script changes these as necessary.
sorry for these seemingly dumb questions.

[JamesPett]

I think I know why the "manual force charge didn't work: I still had Predbat in "Monitor" mode. Changed this to "Control charge" and re-tried the "manual force charge".
Logs show these errors:

Logger: homeassistant.helpers.service
Source: helpers/target.py:131
First occurred: November 21, 2025 at 10:41:54 AM (49 occurrences)
Last logged: 10:03:24 AM

Referenced entities button.solax_powercontrolmode8_trigger are missing or not currently available
Referenced entities select.predbat_manual_api are missing or not currently available
Referenced entities switch.predbat_active are missing or not currently available
Referenced entities select.predbat_mode are missing or not currently available
Referenced entities select.predbat_manual_charge are missing or not currently available

Logger: async_upnp_client.ssdp
Source: components/ssdp/scanner.py:224
First occurred: November 22, 2025 at 10:41:58 AM (429 occurrences)
Last logged: 10:01:57 AM

Received error: [Errno 101] Network unreachable, transport: <_SelectorDatagramTransport fd=38 read=polling write=<idle, bufsize=0>>, socket: <asyncio.TransportSocket fd=38, family=2, type=2, proto=0, laddr=('0.0.0.0', 54724)>

Not sure the second one is relevant, as it was before I tried triggering the force charge

[TCWORLD]

also note that there are several "controls" which are "disabled", but could be "enabled" via drop down settings

As noted in #259 (comment), make sure all the settings shown there are enabled. You have to do this manually if they are not, the script cannot do it for you.