Huawei SUN2000 PV and LUNA200 Battery integration

[owlmerely]

Hello,

I will soon have my solar panels and home battery installed.
Setup consists of 2x Huwai SUN2000 inverters and 2x LUNA2000 battery modules .

I was checking the docs to see how to integrate them into my existing evcc installation (charger and car integration only) in order to maximise solar and battery charging but some parts leave me confused.
I would like to be able to use the Active Battery Control but I am unsure about what the requirments are to make this work.

The doc states the following:

SUN2000
Grid and Battery require the PowerSensor. Modbus/TCP requires activation using "maintenance access" within the communication settings of the inverter. See https://forum.huawei.com/enterprise/en/modbus-tcp-guide/thread/667250677153415168-667213868771979264

Can someone explain me why the PowerSensor is needed ? Is it only for monitoring purpose or are we suppose to interact with the battery trough Modbus TCP/IP on that PowerSensor ?
For the PV part, the PowerSensor is not needed if I read this correctly ?

Thanks by advance

[crazyfx1]

Even without EVCC you need the Powersensor (Huawei DTSU666) or Huawei EMMA for your setup to work correctly. Without power sensor, your inverter cannot know how much power the battery should charge or discharge to the grid.

Same for EVCC. It uses data from the power sensor to calculate the charging speed.
The connection works via Modbus TCP/IP to the inverter (either using the dongle or the wireless connection).

[owlmerely]

Thanks, that all makes sense

[RTTTC]

Power sensor is essentially a small smart meter that measures your import/export power/energy/voltage/current.
I'm pretty sure you will have it, since it is mandatory for the battery.

More importantly - since it seems like you will have a lot of Huawei devices to get data from - your device read out time will be long...

[owlmerely]

Right, I wasn't sure about the where this piece of hardware was supposed to be placed. Thanks for confirming.

More importantly - since it seems like you will have a lot of Huawei devices to get data from - your device read out time will be long...

Can you ellaborate about this one ?

[RTTTC]

Huawei modbus via Sdongle is extremely slow.. Plenty of previous discussions here..
But, perhaps and hopefully something is improved and is better in your newer system, and maybe it will not be an issue for you ?

[owlmerely]

Hi again

Thanks for pointing that out!
I wasn't aware that Huawei's dongle would be that much troubles.
I guess I will most likely have the same issues has everyone given the dual inverter in cascade mode + the LUNA200 batteries.

Given that the main issue seems to be related to the SDongle not being able to process to many requests, I was wondering if bypassing Huawei's SDongle for grid an pv meters and only use it for Battery would be an option here.
I already have a Homewizard P1 Meter for grid usage and was thinking of connecting a Homewizard kWh Meters to each inverter to monitor PV usage (both devices have supported templates in evcc)

I am just unsure if it will works (does evcc requires you to use all three of the SUN2000 meters from the template to work ?) and if I will be able to use the active battery control.

[crazyfx1]

Whats currently your issue with the dongle?
It might not be the fastest but on the default interval of 30seconds it should be no problem.

[owlmerely]

No issues yet as I am still evaluating if the proposed solar setup will meet my needs with evcc.

So far, the installer proposed the following:

• 2x SUN2000-4KTL-L1 inverters (interconnected in cascading mode)
• 1x SDongleA-05 plugged into the "master" inveter
• 1x DTSU666-H-250A Smart Power Sensor
• 1x LUNA200 14kwh (2x 7kwh modules)

But by reading other posts, it seems that timeouts are a known issue when querying querying multiple devices trough the SDongle.
See #20707 (comment) and #16063

That's bascially the reason why I was wondering if delegating the gird and pv measurements to other non-huawei devices would improve the performance and if it's a supported option.