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**SOLVED** Solar Assistant & Sunsynk 2-in-1 BMS Port: Cannot get it to work


rgt.dnl

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SOLVED: 

 

UPDATE: If you want a clean solution,  Solar Assistant now sells a specialised splitter - https://solar-assistant.io/shop/products/deye_rj45_split

 

Hello, I am new here so apologies if I am posting in the wrong place.

I recently got a Sunsynk 5 kW inverter 5.32kWh battery installed. I have the Sunsynk Data Logger attached to the WiFi/RS232 port. I want to attach Solar Assistant (SA) to my system but the RS485 and CAN port are combined on my inverter and the CAN is currently connected to my battery. So, I need a RJ45 splitter to attach both the BMS cable from the battery and the cable from Solar Assistant. Sounds very straightforward. However, using multiple (6) Solar Assistant recommended splitters (https://soundtech.co.za/rj45-ethernet-splitter-2-pack.html) I am still not able to get everything to work together. Attaching the SA cable to the splitter works. Or adding the BMS cable to the splitter works. BUT adding both does not work. I get various errors (see attached). One of the splitters managed to connect with both cables attached but only intermittently and data in SA was weird. "Connected" and "Invalid address" displayed alternatively every second or so.

I was wondering if anyone has had the same issue and how they went about solving it. Alternatively, if anyone has any ideas about how this problem could be solved, I'd be grateful for that too.

Here is an explanation from SA: https://solar-assistant.io/help/deye/2_in_1_bms_port

Screenshot_20230505-093327~2.png

Screenshot_20230505-093206~2.png

Screenshot_20230505-093551~2.png

Edited by rgt.dnl
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  • rgt.dnl changed the title to Solar Assistant & Sunsynk 2-in-1 BMS Port: Cannot get it to work

It's a Sunsynk Battery and it is communicating with the inverter via CAN.

On my inverter, the RS485 and CAN port are not separate (see attached)

SA works fine in the port on it own but then comms between battery and inverter not possible 

PXL_20230504_131108254~2.jpg

Edited by rgt.dnl
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Have you tried a different lan cable from the splitter to the inverter port?

Although at the rate sunsynk are changing those ports around I wouldn't be surprised if its a change on their side allowing only one of the two! 

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If its the light brown one as per the website then that's the correct one, which should work. 

I ordered from them as well and used the same thing and it works. 

If that's not working, I don't think the crimping it into one rj45 connector would work either, but it's worth a try to isolate the splitter being the issue. 

Edited by abd7
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The reason I included the link was also for the troubleshooting section. 
 

Troubleshooting

When using a RJ45 splitter, it might lead you to connect the RS485 pins into the battery in addition to the CAN pins. The battery might use those pins for a different purpose and disrupt SolarAssistant monitoring communication. The battery CAN cable should only connect the CAN pins to the battery.

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51 minutes ago, abd7 said:

If its the light brown one as per the website then that's the correct one, which should work. 

I ordered from them as well and used the same thing and it works. 

If that's not working, I don't think the crimping it into one rj45 connector would work either, but it's worth a try to isolate the splitter being the issue. 

Yip, its the one they recommended on their site. Its just doesn't work. Are you saying that I should try and replace the CAN cable running between the battery CAN port and the inverter BMS RS485/CAN port?

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24 minutes ago, Chunks said:

The reason I included the link was also for the troubleshooting section. 
 

Troubleshooting

When using a RJ45 splitter, it might lead you to connect the RS485 pins into the battery in addition to the CAN pins. The battery might use those pins for a different purpose and disrupt SolarAssistant monitoring communication. The battery CAN cable should only connect the CAN pins to the battery.

Yes, good point. I actually checked in with SA on this point. They were confident it would work. I am completely stumped. There is nothing wrong with the existing BMS CAN cable between the Battery and the Inverter i.e., it reports the battery status etc. And there is nothing wrong with SA Deye / SunSynk / Sol-Ark RS485 cable. If only connected to BMS RS485/CAN port on the inverter, it works. I kid you not, I have tried SIX of those cheap splitters from Soundtech. All give different results (see images in opening post), even at the level of which of the two split ports you put the SA and BMS cable. I've tried the ordering of inserting the cable as well.

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30 minutes ago, rgt.dnl said:

Yip, its the one they recommended on their site. Its just doesn't work. Are you saying that I should try and replace the CAN cable running between the battery CAN port and the inverter BMS RS485/CAN port?

The troubleshooting is saying is that you should make up a cable / get someone to make one, where only the pins 4 and 5 are crimped, you can use a normal lan cable for this (ideally pure copper shielded  cat5e /cat 6 cable)  , only crimp 2 out of the 8 wires, same colours on both sides into the pins 4 and 5. (the battery side pins should be checked in the manual.. Which  are the CAN pins being used.) I think this would sort the issue out. Check which can pins to use on the battery side. Worth a try 

 

Edited by abd7
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12 minutes ago, abd7 said:

The troubleshooting is saying is that you should make up a cable / get someone to make one, where only the pins 4 and 5 are crimped, you can use a normal lan cable for this (ideally pure copper shielded  cat5e /cat 6 cable)  , only crimp 2 out of the 8 wires, same colours on both sides into the pins 4 and 5. (the battery side pins should be checked in the manual.. Which  are the CAN pins being used.) I think this would sort the issue out. Check which can pins to use on the battery side. Worth a try 

 

Thanks. I have been thinking the same. I have no idea who would make a cable like that for me. Any ideas?

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14 hours ago, abd7 said:

 

 

12 hours ago, Chunks said:

 

 

8 hours ago, abd7 said:

You can make it yourself easily with a crimping tool, and 2 loose rj45 connectors. Alternatively if you in Johannesburg speak to @Steve87

Thanks. I really appreciate all your help on this. That will be an interesting learning curve. Never done it before. I am in Cape Town. @Steve87 do you know anyone in these parts who can help?

Edited by rgt.dnl
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If your neighbourhood PC shop can't help or you don't have a buddy with the tools, chat to LinkQage. I know they will make up custom cables. (You'll likely just pay a bit for the privilege.)

If it was me, I'd make separate RS485 and CAN cables with both only having the relevant pins crimped. And then plug them into the splitter at the inverter. 

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3 hours ago, abd7 said:

Should work fine.. Although it's best to minimise those type of joints. Also better to use shielded cable since it will be in close proximity to cables carrying power. 

Thank you. I will do that and let you know how I get on

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2 hours ago, sgs said:

If your neighbourhood PC shop can't help or you don't have a buddy with the tools, chat to LinkQage. I know they will make up custom cables. (You'll likely just pay a bit for the privilege.)

If it was me, I'd make separate RS485 and CAN cables with both only having the relevant pins crimped. And then plug them into the splitter at the inverter. 

Thanks. I will check LinkQage out. 

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I have the same Sunsynk inverter/battery combo and had the same issue you now have.

The splitter recommended by SA will work, however you need to slightly modify the splitter. On the port of the splitter you are plugging the cable from the battery into, you need to clip all the pins except for the two used for CAN comms. If I remember corretly, it is the middle two of the 8 pins that must remain in place.

Something from the Sunsynk battery's CAN port communicates on the same pins used by SA's RS485 cable. When clipping those pins on the splitter, it stop that battery comms from interfering.

Edited by DawieZA
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Yes, I did open my splitter. The only thing I did differently was clipping the spring-loaded pins. I see you clipped the internal pins behind the spring-loaded pins. That should have worked as well.

Just to confirm, you made sure when reassembling the splitter that the spring-loaded pins all fall back into their original positions?

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Success! Finally. I bought another splitter and did not do anything to it. Instead, I used insulation tape to cover the pins not needed (1,2,3,6,7,8) for the CAN comms on the cable coming from the battery. So only pins 4&5 exposed on RJ45 network plug end (battery to inverter network cable). See attached image. Confirmed both are reading and connected (see attached)

Thank you to all of you for your brilliant ideas and being so generous with your knowledge and advice 

PXL_20230507_100619112.jpg

Screenshot_20230507-120638.png

PXL_20230507_171019798~2.jpg

UPDATE: If you want a clean solution,  Solar Assistant now sells a specialised splitter - https://solar-assistant.io/shop/products/deye_rj45_split

Edited by rgt.dnl
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