Hi All!

I have read many of the topics around the Deye inverter and Pylontech Batteries, and connecting to the BMS etc. However I am struggling to get my Inverter to read my battery. I have a Deye 5Kw with Pylontech US2000c and Solar Assistant running.
I have the Splitter from Geewiz, and have a cable crimped with pins 3 and 4 only connected to the splitter and battery.

Solar Assistant works perfectly, but the inverter doesn't read the battery temps, and the SoC doesn't work (I have had to set it to 100ah to make it all work).

I have gone through several of the posts here on what to do (Most were around the pin allocation for the battery comms), so Solar Assistant is on Pin 1, 2 and 3, and then battery on 4 and 5. I have tried setting the Inverter to 00 (Where SA does connect fine) and to protocol 12 as well (Meant to be for Pylontech) but then SA doesn't connect.

I have nearly given up hope on getting this working and almost deciding to just get a new battery that connects easily but feel that it should all be working, just stuck somewhere and don't know where.

FYI - I'm relatively tech experienced, but not very clued up around inverters etc.

Thanks in advance

If I may ask, did you not rather want to buy the correct cables etc directly from Solar Assistant instead of making your own? I ask this cos I tried using a cable of my own (different usage) and it didn't work properly. the SA recommended one worked perfectly.

Also, does the Pylontech battery have those 8 little dip switches? Are they too also correctly configured for Master and Slave?

What about feeding the batteries directly into SA instead of via the inverter?

MdF

Thanks for the reply!

Sorry, I make a mistake in my original message! I bought the splitter and SA / Inverter Cable from SA directly, and had a normal ethernet cable from the battery to the splitter. Seeing this forum lots of people spoke about having a cable specifically for pin 4 and 5 only for comms with the battery, so this weekend I did that quick but it didn't make a difference.

It has dip switches, but is currently configured as master / single battery.

I'm not sure how to feed the battery directly into SA itself? I just assumed it needs to go through the inverter so that the Inverter manages the battery side of things.

Ok, so I bought a cable from SA for direct connection of my batteries to the SA Pi. It never did work as my batteries were not supported by SA, but I just wanted to see if it would work.

Have at look at the link below as per the attachement. This cable will connect directly from the battery into SA:

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

Ah ok, I saw this, and wasn't sure if I should try this or not. So does this then plug into the RS485 port on the battery and then into the Pi? And then there is still the cable from the CAN port on the battery to the Splitter in the Inverter? Not that it makes a difference I guess as the inverter is not reading the battery BMS anyway.
Does this work on your SA? And once it is plugged in, how do you set SA to read directly from the battery and not the inverter? Just change it to Pylontech (RS485)?

https://powerforum.co.za/topic/31559-pylontech-deye-bms-cable-help/

Ideally you need to get the inverter to battery communication running. It's important. See above links you can try. Dip switches on the batteries also affect it. If you not coming right maybe get an installer to help you. Where are you based?

Thanks! I am located in Cape Town / Brackenfell. Unfortunately my installer is... let's just leave it there.
I have read that post, and that is what concerns me, as they have this:

Where as other posts it is just 4 -->4 and 5-->5, which is what my cable is. Pin 2 is currently used by the SA Splitter.

If I look at the Battery info on the Inverter I see this:

So it is getting some info, but not the temp (I don't know if it will actually get the temp). I am looking at getting the cable suggested above which will plug into the Console port of the Battery and then into SA directly, so at least SA will have battery info. I just have 0 confidence in this battery and considering replacing it with something like a Revov R100 (Going from 2.4kWh up to 5.1 would be amazing already). This battery was never about being used except for during load shedding.

So you do have battery comms to your inverter already then by the looks of it?

Edited April 10, 20251 yr by abd7