[Bug]: Parallel Mode setup sensor.solax_pm_i2_battery_current_charge value is often at 6400A about homeassistant-solax-modbus

[a1bert01]

just checked on our 3xH34A15

[wills106]

I know the SolaX doc doesn't mention anything about termination resistors. But have you tried adding them?

#743 (comment)

Have you tried the Bus conflict option mentioned #804 (comment) also the Multi-Host setting could help to remove the spikes.

[romankysely]

Thx wills106 for interesting hints. I do not have resistors either Mulit-host settings. I am going to test it gradualy.

1. step Mulit-host settings. I changed Waveshare settings and I am waiting for results.
   

To be sure: I am physicaly connected ( 2 wires without GND) with Waveshare ONLY to Master and ALL data is coming from Master(?). So Master Invertor is containing (collect) data also for Slave via Solax "internal Modbus CAN2-CAN1" or Waveshare is communicating also with Slave directly via Modbus and data integration is inside HA Solax Modbus Integration? In the other words who is integrator? Master internaly or Solax Invertor Modbus Integration?
@a1bert01 are you going to test it too?

[romankysely]

Continuation and results:

1. step: completed - no success
2. step: used 120 Ohm resistor and terminate Modbus on the Waveshare only - no success
3. step: used 120 Ohm resistor and terminate Modbus on the Waveshare and Invertor Slave port COM - no success

When You look to graph it doesnt look like random spike problem on the electric level. During night is long state of the peek uninterupted. It seems like coincident with PV activity or charging battery generally. Any idea pls?

[ladaan]

Hi Roman,
Have you resolved the issue? I am in charge of 2 Solax Gen4 15kW inverters in parallel mode and using this Solax Modbus integration where in both are Solax Pocket Wifi 3.0. I am not installer of the Solax parallel solution but just a guy who wants to configure several automations (e.g. Export limit to 0 W when the price of the electricity on the market is low etc.). Not sure why there are two dongles since they are connected via Modbus (CAN ports). Possibly this is due to monitoring on Solax Cloud..
However, I am not happy with a lot of values shown in comparison with single installation.
Cheers,
Lada

[ladaan]

Couldn't it be related to Solax firmware (DSP and ARM) versions than to this plugin itself? plugin_solax.py just reads data from registers. I have spikes e.g. in PM PV Power (it reaches value 2^32) on versions (Firmware: DSP v1.33 ARM v1.31). The latest are DSP v1.42 and ARM v1.41.

[ladaan]

This is what I see.