Gambit

That is strange. I also bought one from him and it was a devkit c board with 4MB flash. How are you flashing it? Are you using the web tool https://web.esphome.io/ ?

@iiznh I was also wanting to buy another one. Do you have an ETA?

Sounds like your esp32 dev board only has 2MB flash chip. Do you have a product link where you purchased it? Usually the ESP32 dev boards have at least 4MB flash

This looks like a great project. My only concern is you would lose inverter firmware updates functionality

Did Sunsynk support provide any register documentation for their batteries?

You have to setup an automation to get new data. alias: Solcast_update description: New API call Solcast trigger: - platform: time_pattern hours: /4 condition: - condition: sun before: sunset after: sunrise action: - service: solcast_solar.update_forecasts data: {} mode: single

You have to setup an automation to get new data. alias: Solcast_update description: New API call Solcast trigger: - platform: time_pattern hours: /4 condition: - condition: sun before: sunset after: sunrise action: - service: solcast_solar.update_forecasts data: {} mode: single

Thanks @slipx I'll probably add the TZ env vars to my docker compose file to circumvent further issues.

Yeah, mine is set correctly. My automations would have issues if it wasn't. The ESPHome time component uses the timezone from the ESPHome server not Home Assistant.

My Home Assistant server is set to the correct time zone, I did assume it would use that however according to the ESPHome Time Component documentation it will use the ESPHome server timezone. I guess it uses this at the firmware compile time to set the device timezone if it hasn't been specified in the YAML. My ESPHome is running in docker and I haven't modified the TZ environment variable so it is just defaulting to UTC. I guess the ESPHome log web interface gets the correct time offset from the browser when it displays the logs.

setting the timezone appears to have worked

I found I can add the time zone to the time component, giving that a try. time: - platform: homeassistant id: homeassistant_time timezone: Africa/Johannesburg

@slipx I'm using your ESPHome yaml for my Sunsynk 8Kw inverter. Thanks for these updates for syncing the time, it is much appreciated. This time sync appears to be working great with the exception that my inverter time is now exactly 2 hours behind local time. I guess it is syncing GMT instead of CAT, my HA server has the correct time zone set and the ESPHome logs on the ESP32 are show the correct time, not sure why GMT is being synced. Any ideas on how to get local time on the inverter?

Thanks. I'll have a look at Solar Assistant

Check this thread

Been looking for documentation on the Sunsynk battery modbus implementation but so far have only found the document for the inverters. Was hoping to use the rs-485 port but might make more sense to use the CAN bus instead as the batteries are already communicating via CAN with themselves and the inverter. Was thinking of connecting a USB CAN analyser to my laptop to record the communication between the inverter and the batteries. Might get some useful information to figure it out.

Hi I currently have an 8Kw Sunsynk inverter connected to 2 x 5.12kw Sunsynk batteries which are about 1 and half years old. I would like to purchase an extra battery and see they now have 5.32Kw capacity batteries. Other than the small capacity difference, they have similar specs. Is it possible to add a 5.32Kw to a bank of 2 x 5.12Kw and have it all play nicely together? I think I read somewhere that the older batteries will likely need a firmware update for the BMSs to communicate with the newer batteries. I am a very technical person, is that something they allow end users to do or do I have to take them somewhere?

I would be interested in doing the same for the Sunsynk batteries if anyone has any info.

Has anyone tried to read BMS values from the Sunsynk 5.32 batteries rs-485 port? Wondering what info you can get that would be useful. I guess the number of cycles would be nice

@iiznh While waiting for your stock to arrive, you consider upgrading smarthomeintegrations.co.za site to try upselling your own firmware and HA dashboards. I honestly went to your site to buy the non-firmware shield. Still, I might have been persuaded to buy the full product if there were some cool marketing visuals and bullet points about why your solution is superior/ easier and worth the extra bucks. I didn't see any reason to buy the full version anywhere

Thanks for the link for the compatible esp32 dev board, this is good to know. The ones I have are these and they were too narrow for the shield. Luckily smart home integrations sent a compatible esp32 with the shield I ordered.

Based on @Sc00bs recommendations I bought one of these esp32 rs485 shield combos from Smart Home Integrations and got the 3d printed case as well. It was a super simple and very neat installation on my Sunsynk 8Kw inverter, works incredibly well with ESPHome firmware and Home Assistant. The Sunsynk app has been down so often lately, this has turned out to be a great investment. I was thinking of buying some more to play with as the price is not bad as it combines the power supply, esp32 and rs485 transceiver requirements in 1 package for R400. The only issue is it appears that Smart Home Integrations has stopped shipping these firmware-free units locally for now. You might need to order from overseas https://www.electrodragon.com/product/esp32-can-rs-485-wire-interface-shield/. Will need the correct esp32 dev board that fits in the socket as @Sc00bs mentioned. The esp32 dev boards I got from https://www.robotics.org.za/ didn't fit.

Has anyone tried to collect sensor metrics directly from the battery BMS eg Synsynk BYD RS232 port? I am not sure if this rabbit hole is worth the effort, what useful data can you collect other than individual battery cycles, cell voltages and temperatures?

My guess would either be that the element has blown or a relay in the control box is no longer working

Still early in my HA journey, was going to look at automating the Sunsynk mode settings next, based on load shedding level. Checking your channel now, I see you have already covered this in one of your videos, going to check that out and give it a go next. Ideally like to vary battery SOC and grid charging based on weather/solar forecast and load shedding level. I have installed the solcast and load-shedding plugins. After that, I want to try to dump excess solar into my Geyser. Still thinking of other use cases for these tools.