Good day to all,

How do we connect the inverter to the Raspberry PI?

Already made a cable from inverter to battery.

As we can see, the cable is connected from the BMS 485/CAN to A/CAN and works 100%.

The battery is connected to the Raspberry Pi.

Still working. Can read the battery values in Solar Assistant.

Now I need to connect the Inverter to the Raspberry Pi.

Will just adding the RS232 to USB cable work?.

Logic tells me it should work, but its always nice to hear from someone that has already done it.

Yes, I will be removing the data logger from the Sunsynk. Their software does not update fast enough and does not give me total control.

Will updating the inverter be possible without the WiFi stick and will the time sync. This is only out of curiosity, not a make or break thing.

As always, thank you for the best forum ever.

 

You could remove the Sunsynk logger and use that rs232 port correct. 

The other option is to use a splitter on the inverter CAN port, which will allow you to then connect the pi to the inverter using RS485 at the same time that the battery comms uses CAN. Solar assistant also sells this splitter. 

Edited September 18, 20241 yr by abd7

2 hours ago, abd7 said:

You could remove the Sunsynk logger and use that rs232 port correct. 

The other option is to use a splitter on the inverter CAN port, which will allow you to then connect the pi to the inverter using RS485 at the same time that the battery comms uses CAN. Solar assistant also sells this splitter. 

Thank you.

Looks like the RS232 cable is the one I'going with.

I used the splitter cable bought through Solar assistant website, this connects the battery to the SunSynk inverter and the inverter to the Raspberry Pi, only issue is with my battery I have to use the inverter settings for the battery.

 

https://solar-assistant.io/shop/products/deye_rj45_split

Edited September 18, 20241 yr by Greglsh

3 hours ago, Greglsh said:

I used the splitter cable bought through Solar assistant website, this connects the battery to the SunSynk inverter and the inverter to the Raspberry Pi, only issue is with my battery I have to use the inverter settings for the battery.

 

https://solar-assistant.io/shop/products/deye_rj45_split

Which type of battery and does LiBMS show your battery values?

If you connect solar assistant only to the inverter (not the battery) , it will still read the battery values the inverter picks up from the BMS, but these are limited (although sufficient for most) compared to the full details you have there by directly connecting solar assistant to the batteries as well. Eg cycles, cell voltages wouldn't be available. 

 

Edited September 18, 20241 yr by abd7

14 minutes ago, abd7 said:

If you connect solar assistant only to the inverter (not the battery) , it will still read the battery values the inverter picks up from the BMS, but these are limited (although sufficient for most) compared to the full details you have there by directly connecting solar assistant to the batteries as well. Eg cycles, cell voltages wouldn't be available. 

 

Thank you. Good to know.

 

On 2024/09/18 at 12:41 PM, Warlok said:

Which type of battery and does LiBMS show your battery values?

So it is a DIY 280ah battery which uses the Seplos BMS, with the Seplos once you have an inverter monitoring the battery you cant have Solar assistant also monitoring the battery directly ( this is what I have seen, and it says the same on the Solar Assistant site for Seplos.

On 2024/09/19 at 12:52 PM, Greglsh said:

So it is a DIY 280ah battery which uses the Seplos BMS, with the Seplos once you have an inverter monitoring the battery you cant have Solar assistant also monitoring the battery directly ( this is what I have seen, and it says the same on the Solar Assistant site for Seplos.

That's an expensive cable. But if you do not read the battery from the inverter it should work nicely