Supporting Growatt MOD inverters

[Star442]

Hi Dala!

Great effort on this, is there anyway to help out and try to add support for Growatt Inverters?

[dalathegreat]

Hi @SelverC ,
To start integration with a new inverter/battery type, logs need to be taken from a working system. So, get a CAN / Modbus sniffer, and visit a place that has a Growatt+battery working, and start collecting data!

[Star442]

Hi @dalathegreat,

I already own a set, so do you have sniffer to recommended(I think it uses Modbus RTU)?

[dalathegreat]

@SelverC , Ebay/amazon/aliexpress has inexpensive (<5€) dongles you can get. Just search for "Modbus USB"

[dalathegreat]

Also @SelverC , please post exact model numbers of the Inverter / Battery ! :)

[Star442]

@dalathegreat
Inverter: Growatt MOD 8000TL3-XH
Battery: Growatt ARK-2.5H-A1 with Growatt BMS BDC 95045-A1

Also I will try and use my already existing https://www.waveshare.com/usb-to-rs485.htm and see if it works to sniff with it

[Palmtree1455]

I'm wondering about the Growatt MIN series for the US. I'll be interested in your findings.

[edmundasa]

@SelverC any progress on those logs? I'm considering this inverter as I can get it cheaper than others. Fingers crossed that you can get them. Thank you both.

[Palmtree1455]

I think I'm going to try the solis s6 instead.

[tmlarsson]

Following this as I recently got my hands on one of these at a killer price.

[Palmtree1455]

Where did you find the killer price?

…

On Tue, Mar 26, 2024, 9:16 AM tmlarsson ***@***.***> wrote: Following this as I recently got my hands on one of these at a killer price. — Reply to this email directly, view it on GitHub <#156 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BGCBB76VEVWABNXZEBCJCN3Y2FYKRAVCNFSM6AAAAABC2HG7DWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDAMRQGU2TCNBUHA> . You are receiving this because you commented.Message ID: ***@***.***>

[tmlarsson]

@Palmtree1455 Bought a 8000w xh version second hand for 400 EUR locally in Sweden

[Star442]

Hi Guys :) I have changed plans and inverter and battery are already sold.
So I will not be able to produce some logs for it, sorry!

[tmlarsson]

Think I maybe have found a protocol specification for these inverters.

Growatt PV Inverter Modbus RS485 RTU Protocol v120.pdf

From this project that looks very interesting!

https://github.com/ai-republic/bms-to-inverter?tab=readme-ov-file

[dalathegreat]

@tmlarsson Looks like 48V Modbus registers, would be better to get a High voltage communication log from a running system. Without that, it's almost like guessing everything!

[dalathegreat]

To continue with the Growatt integration, we need logs from someone that has a functional Growatt + Growatt ARK battery setup. If we get those logs, we can start to develop support for Growatt emulation. Please let us know if you know someone with a "ARK XH Battery System(7.68kWh 25.6kWh)" battery willing to log!

[ErikssonPer]

Hi, I've got growatt SPH10000 and a 10kWh ark battery that I can pull some logs from with either a kvaser canusb or waveshare canhat.

Should i make log of a full charge/recharge cycle or speciific moments like near the end of charge when the current is beginning to ramp down or a power up sequence?

Happy to help out.

[dalathegreat]

Hi @ErikssonPer , that would be great! I have instructions here on what is needed: https://github.com/dalathegreat/Battery-Emulator/wiki/Data-needed-for-new-inverter-integration

[ErikssonPer]

Did some logs today.
Included a screenshot of how the bms is ramping down the current step by step near the end of charging.
Start of inverter and then battery.txt
Charging to full.txt
Charging.txt
discharging.txt
Inverter shutdown.txt
Battery Shutdown.txt

[Star442]

@ErikssonPer Great!

But it's a different BMS on the SPH.

MOD/MID/MIC are using the BDC 95045-A1

SPH should use HVC 60050-A1

Not sure what the difference is in the logs but just a heads up

[ErikssonPer]

Who's working on Growatt integration?
I found growatts specs for the high voltage, low voltage CAN protocols and RS485 protocol.
I have checked HV CAN against the logs I've taken from my SPH inverter and it matches.

[dalathegreat]

@ErikssonPer Could you post the files here?

[ErikssonPer]

Communication.protocol.of.Growatt.high.voltage.battery.CAN.V1.10.3.pdf
Growatt-BMS-CAN-Bus-protocol-low-voltage-V1.04-1 (1).pdf

[dalathegreat]

Thanks @ErikssonPer , I will get started on this!

[Star442]

@dalathegreat thats really great! But is it really LV? As the MOD uses HV? Or did you just start with the LV? But haven't finished HV?

[dalathegreat]

@Star442

HV protocol added here: #788

[Star442]

@Star442

HV protocol added here: #788

Perfect! I can test and double check it with a real ARK setup

[dalathegreat]

Do note that the communication protocol posted by @ErikssonPer is only applicable to inverters compatible with the HVC 60050-A1 BMS. And accorning to Growatt documentation that is SPH/SPA 4000-10000TL3 BH-UP inverters. I have updated the Wiki, but someone feel free to add more info there!

[ErikssonPer]

@dalathegreat
Did a quick and dirty test with it set as a fake battery matching the actual voltage my batterypack has right now and it is able to charge and discharge the battery and responds to the max charge and discharge currents set in the software also.

Looks like a win!

Next will be to run it all the way to max and min SOC and check that it reacts correctly to the limits set.

[dalathegreat]

Be careful running fake battery, best to switch to actual battery protocol before further testing! Nice to see it works!

[dalathegreat]

Since both Growatt HV and Growatt LV have been added now, let's close this as completed, and continue in new issue threads incase there are any problems. Thanks again to all that contributed to getting these protocols in 🙌