Wattsonic photovoltaic power plant FVE - integration

ddicht · July 4, 2024, 9:49am

Hello everyone!
I would like to charge my battery from the grid at favorable electricity times - especially in winter. So far it has worked quite well with the scripts (economy mode and general mode)

I have now expanded the system with another inverter from Wattsonic. The new inverter is now the slave and the old inverter is the master.

Since this expansion, the main inverter has been running in “EMS_BattCtrlMode” mode, which is correct according to the electrician.

But now I can no longer set the inverter to economy mode to charge the battery via the network.

According to the modbus and register description, there are registers 50207 - 50210 that are supposed to enable battery force charging, but I can’t see through them.

Does anyone here have any experience?

Or should I just go the route of simply setting the On-grid Battery End SOC limit to e.g. Set it to 99 percent and then set it back to a lower value after charging? (can you somehow control the charging speed here?)

Many thanks for your help

GiZMoSK · July 4, 2024, 10:22am

can you change the mode to economy in their app?

ddicht · July 5, 2024, 3:41am

Hi - no this doesn t work

Zwergnase94 · July 16, 2024, 5:22am

Hi,

I have an A-Tronix AX-Serie 3ph inverter. As I understand it here in the forum, this is a rebranding. I only just know how exactly I can transfer the data. My smart meter is connected to pins 3 and 4. Do I have to tap the data here in parallel?

maxym · July 20, 2024, 8:14am

Hello
The new owner of Wattsonic gen3 here.

Is Modbus RTU still the only way how to read data from this converter?
In the past, there were mentions that other methods may come in the future.

In the most recent mobile app I can see a Direct Connection option. Which could indicate such a feature. The search device doesn’t work for some reason though.

The manual mentions S Tools application which is intended to communicate with the convertor via Wifi. So again, it looks like the ability it here.

If Modbus RTU is still the only one option, should RS485 converter be connected to EMS pins?

maxym · August 4, 2024, 7:17pm

Hello.
Has anyone succeeded in connecting Wattsonic G3 using this device? https://www.waveshare.com/wiki/RS485_TO_WIFI/ETH#Documentation

It looks like no communication between this device and G3.

What I did:
I enabled termination of EMS port in the connector
I set UART to:

I tried baudrate adaptive as active too

The network setting is as below. Gizmos configuration refers to port 502. I believe this is the same thing. HA doesn’t connect to 502 at all, it attempts to 8899 (as configured see below) and failed.

HA gets no data.

2024-08-04 20:56:51.626 INFO (MainThread) [homeassistant.components.modbus.modbus] modbus wattsonic communication open
2024-08-04 20:56:54.974 ERROR (MainThread) [homeassistant.components.modbus.modbus] Pymodbus: wattsonic: Error: device: 247 address: 10000 -> Modbus Error: [Input/Output] ERROR: No response received after 3 retries

In MQTT (I set the Waveshare device to send data to MQTT), I found a topic “will = offline”

Connectivity led on G3 should blink but it’s constantly lit green.

I have no idea how to debug it further.
I appreciate any help

maniakum · August 8, 2024, 7:51am

Hi, I have port 4196 set on the converter and the same port in the HA configuration in the wattsonic.yaml file.

Did I look at the tutorial?

maxym · August 9, 2024, 10:10pm

The tutorial doesn’t answer my question.
But I figured this out thanks to one Wattsonic Czech FB group member.
I used to have selected wrong Data Transfer Mode.
The proper one is Modbus TCP <=> Modbus RTU

ddicht · August 20, 2024, 9:19am

Hi everyone!
Unfortunately I can’t get any further or don’t want to experiment.

I have a Gen3 Wattsonic and recently a second 6k Wattsonic as a slave with a second PV.
I can read both.

Since the two inverters have been in operation, the mode has changed (correctly according to the manufacturer) to EMS_BattCtrlMode. Since then I can no longer charge the battery from the grid. The inverter can no longer be set to economy mode (it worked without any problems before).

Now I can’t really get to grips with the documentation when it comes to loading in EMS mode and I don’t want to destroy anything

Maybe someone has the patience to give me a hand here.

I have also attached what I think is the relevant documentation.

Thank you in advance.

venomcz · April 7, 2025, 9:12am

Ahoj je možné tě někde soukromně kontaktovat a probrat s tebou něco ? Díky

maxym · September 1, 2025, 5:46pm

Hello
How to set export limit?
I assume I have to call service in order to write register. Do you have an example?

GiZMoSK · September 1, 2025, 6:45pm

for example:

script:
  wattsonic_mode_ups:
    alias: wattsonic_mode_ups
    sequence:
    - service: modbus.write_register
      data:
        address: 50000
        hub: wattsonic
        slave: !secret wattsonic_slave
        value: 259
    mode: single
    icon: mdi:alpha-w-box

maxym · March 11, 2026, 9:47am

I’ve been trying to configure the inverter (Wattsonic G3) for the morning hours. The idea is to delay charging the battery until the cheapest hours (around noon).

From my experiments, setting (ECO, CHARGE, PowerLimit: 0) works well as long as there is enough energy from PV. However, if PV production is not sufficient (ie very early morning and someone boils water for tea), the house draws energy from the grid instead of the battery.

What am I missing? How can I prevent charging the battery while allow to draw energy from it if needed?

By the way, during my experiments, I have hard times getting inverter back to General mode. I would expect that in General Mode it ignores all ECO settings, but it seems these settings still have some influence. At one point, the inverter was in clearly in General Mode for longer period of time, let’s say 10minutes, yet it neither charged nor discharged the battery—it simply ignored it. There were no errors.

Even switching modes using the Wattsonic app did not fix the issue. I tried various settings to resolve it, so I’m not exactly sure what fixed it in the end. It might have been either deactivating the time period or changing the charge mode (PV vs. PV+Grid).

Could you confirm whether such a dependency exists?

edit: FW version of my inverter is v2 (As far as I read some newer versions are less unstable) However I found article (in Czech) that with new firmwares new ToU modes are available. It also means that current modbus integration does not support new features. Is there any chance that the author take a look on that?
The article contains the link to PDF describing all new sub-modes and extended ToU.

maxym · March 15, 2026, 11:31pm

Seems no Wattsonic user optimizes ROI by shifting charging time to the cheapest hours?

If any, I found the solution, and created a pull request to the integration GitHub.

It brings two significant improvements:

adds two missing registers allowing to limit the current for battery charge and discharge. Specifically, it makes possible to utilize the General mode with charging disabled.
extends support for new modes introduced in the v3 firmware of Gen3 inverters. These are Feed-in , Peak shift , and TuO. Note that the Feed-in mode behaves exactly like General with battery charge disabled.

For other changes, please refer to the PR description

BTW, I wrote very simple yet effective automation(s), for ROI optimization by charging and discharging the battery with the best timing. I should publish that within a few days. Sneak-peek:

lizdodd · April 10, 2026, 6:13am

I’m very interested in optimising charging and discharging my Solinteg branded Wattsonic.
I haven’t written before, because I have only had the inverter 6 days.
I am changing to an electricity plan with 3 hours free energy and a bonus for exporting during the evening peak.
May I request that you publish your automation soon?