How to connect to a Huawei SUN2000 invertor (FusionSolar)

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Gert Stalpaert

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Oct 30, 2022, 3:57:30 PM10/30/22
to Loxone English
Hi,

How can I get my inverter data (for my solar panels) into Loxone?
I'm on a Huawei SUN2000.

I don't use a home battery for now.

Thanks,
Gert

Jonathan Dixon

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Oct 30, 2022, 5:15:31 PM10/30/22
to Gert Stalpaert, Loxone English

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Gert Stalpaert

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Oct 30, 2022, 5:53:01 PM10/30/22
to Jonathan Dixon, Loxone English
Thanks for the links, Jonahan!

Gert Stalpaert

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Oct 30, 2022, 5:57:52 PM10/30/22
to g...@camleyphotographic.com, Jonathan Dixon, Loxone English
That's cool, George! 
So you are able to connect using Modbus without the extra SmartDongle?

I have a spare ESP32, so it would be awesome if you could share the code.
How/where do you connect the RS485 adapter?

Thanks!
Gert


On Sun, 30 Oct 2022 at 22:42, <g...@camleyphotographic.com> wrote:

To connect modbus RTU to Loxone I have used a Tasmota with a RS485 adapter with great success. It was a little tricky to setup as I initially bought an incompatible rs485 adapter.

 

I am happy to share the compiled source code. Plus some hints/tips, should anyone want them.

 

It is rather effective and uses a wifi connection. Plus, cost under three GBP as I already had an unused esp12 board.

 

This really nice thing is the Tasmota has a console so you can eliminate issues as either being between the bride and RTU device, or between Loxone and the bridge.

 

Best wishes, George

g...@camleyphotographic.com

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Oct 31, 2022, 3:25:35 AM10/31/22
to Gert Stalpaert, Jonathan Dixon, Loxone English

Correct. I use a miniserver gen 1 which communicates with the Tasmota via Modbus TCP. No extra hardware or licenses. The Tasmota then communicates via rs485 to the Modbus device via 3 lines (gnd/A/B) and this £3 breakout.

 

This is the breakout I use.

 

https://www.ebay.co.uk/itm/274273632839

 

Needless to say, it did take me a few days to figure it out. Modbus is not known for its easy of use.

 

I have quite a lot of experience using Tasmota. So this part was very straight forward for me, eg compiling, uploading and testing.

 

https://tasmota.github.io/docs/Modbus-Bridge/

 

Best wishes, George

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