Hello

I hope you are well. I am looking for advice on how to connect Pylontech batteries together.

Please could someone look at the diagram I have attached and if you could tell me where I have potentially gone wrong.

According to the distributor, the connections are 100% correct.

Regards,

Simon

No, you just daisy chain them. 1 to 2 to 3 to 4 to 5 to 6 to 7 to 8 to 9 to 10 to 11.

Hello Tinbum 

I hope you are well. The header battery in each bank is a US3000C and the child/children batteries are US3000As. So 3 x US3000C and 8 x US3000A. Is the daisy chain still possible? Sorry I forgot to include this initial detail. Just double checking, that's all!

Regards,

Simon

Edited January 27Jan 27 by Simon M.

You can only have 7 of the US3000A in daisy chained. If you look in the manual for the 3000C it gives the positions for the different types..

For banks you can use the RS485 as shown in the manual, I think.

 

2 hours ago, Simon M. said:

The header battery in each bank is a US3000C and the child/children batteries are US3000As. So 3 x US3000C and 8 x US3000A. Is the daisy chain still possible?

For a shame no.

The longest daisy chain in your case would look like this:

• CAN
• 1. US3000C
• 2. US3000
• 3. US3000
• 4. US3000
• 5. US3000
• 6. US3000
• 7. US3000
• 8. US3000
• 9. US3000C
• 10. US3000C

No LV-HUB needed for the above. Not possible to utilize 11th US3000 battery. FW update required.

 

To be honest, the above would be the preferred way for me, in order to keep things as simple as possible. I would test it first, then sell the 11th US3000 and buy US3000C instead. Then, the max daisy chain would be up to 16 bricks.

The other way is to use LV-HUB, just like your original idea. The only comment is that the groups are to be chained via connecting A/CAN to B/RS485. Not A to A or LinkPort0 to B.

 

https://www.ostrovni-elektrarny.cz/docs/us3000c-manual-eng.pdf (see PAGE 23 - Multi Grouping)

 

 

 

 

Edited January 27Jan 27 by Youda
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Just a note for the curious:

• Ports A/CAN and B/RS485 on the US3000C are having both protocols in each port. So the A is technically CAN+RS485, B is CAN+RS485 too.
• Daisy chaining of multiple "piles" together runs over RS485 protocol, the conversion to CAN protocol is done by the LV-HUB in the last step.
• Daisy chaining of individual bricks within a single pile uses RS485 protocol too, but this time via LinkPort0 and 1 ports.

 

 

Pretty sure you can do it without using a hub just using the RS485. (also shown in the manual). (if the inverter supports RS485).

Edited January 27Jan 27 by Tinbum

That really depends on the inverter.

If the inverter wants RS485 as BMS input, you can skip the LV-HUB in the last step. That's the case for Axperts, for example.

If the inverter wants CAN BUS as BMS input, you need to supply CAN. That's the case of Victron, etc.

On top of it, there another catch: with the RS485 the inverter firmware has to support not just the BMS protocol itself, but also a total number of piles and Pylontech batteries connected. AFAIK, some inverters with RS485 BMS IO support just 2 piles of the batteries. Not being able to address more.

With CAN the number of batteries and piles does not matter. Once the inverter supports CAN for BMS, you can connect all the batteries and piles you have.

 

Thank you, guys. I will attempt today and send screen shots if that helps....

I followed these steps to the tee! Solar Assistant still not picking up these other batteries. All the dipswitches were set to 0000. I turned on the batteries. The master group 1 beeped three times. I turned switch number 2 on the master group 1 to ON. I then turned the LV Hub on and if I remembered it beeped. 

Still only 4 batteries being picked up. I rebooted the Solar Assistant to see if that was potentially needed and same result.

Try this.

LV hub US3000C.pdf

Thanks!

I checked the manual. These are the same instructions as Youda shared. I am expecting an email from Pylontech. I am going to share with you what they say. You have both been VERY helpful. This thing is very frustrating as the distributor locally is literally radio silent and when they do comment, their support is worse than useless!

Edited January 31Jan 31 by Simon M.

Have you checked the cable between the hub and master is as described?

Yes I saw that. I have noted that with the distributor and am awaiting feedback.

11 minutes ago, Simon M. said:

Yes I saw that. I have noted that with the distributor and am awaiting feedback.

If you look at the RJ45 you should be able to see which pins are populated.

Hi @Simon M. - let's divide problem in parts.

1) How is SolarAssistant (SA) connected to the LV-HUB BMS? CAN, RS485, else?

2) Ditch the LV-HUB for now. Form a totally separate group using just 8 daisy-chained batteries. Connect SA to the master and tell us how many batteries it will see.

I have found these cables as I suspect the cables supplied between the masters is the issue. I am going to try this and if it doesn't work I am reverting to your suggestion. My issue is connecting between the banks. I don't have long enough cables. I only have those short cables between each battery. So I need to find the Port 0 to Port 1 cable which is at least 3m.

7 minutes ago, Simon M. said:

So I need to find the Port 0 to Port 1 cable which is at least 3m.

LinkPort cables are straight. Pin1 to Pin1 etc.

Just get a standard 3m computer UTP Patchcord for 2 USD and it will work OK.

(Cable you found is from the pylontech connection set and is meant for bms to inverter connection. Not sure whether it is wired 1-1 or not.)

Edited January 31Jan 31 by Youda
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It is connected to the CONSOLE port on the bank 1 header. I didn't see any CONSOLE port on the LV hub.

1 hour ago, Simon M. said:

It is connected to the CONSOLE port on the bank 1 header. I didn't see any CONSOLE port on the LV hub.

Great. So the SolarAssistant is connected to the Console (RS232) port of the Bank1 master. That makes sense.
It also means, that you will not be able to see in SA anything else than the batteries that are in Bank1.

If you want to see more batteries in the SA, you will need to make Bank1 larger. For example with that standard computer 3m UTP Cat5E cable.

 

Q: Is inverter connected to the LV HUB somehow? For example via CAN or RS485.

Inverter isn't connected to the LV Hub. The master battery in Bank 1 is. What cable would I use to connect the inverters to the LV Hub?

3 minutes ago, Simon M. said:

Inverter isn't connected to the LV Hub. The master battery in Bank 1 is. What cable would I use to connect the inverters to the LV Hub?

Same one.

Just double checked. Inverters are plugged into Solar Assistant and the Pylontechs (Master Group 1) are plugged into the Solar Assistant too. 

Good.

I see that you have RCT and Infinisolar in your setup. Not sure whether they are combined in parallel or standalone, but this is reality:

• If parallel, then they are not able to talk to Pylontech
• If standalone, one of them can be connected to LV HUB via RS485 and a special RS485 BMS card (aka Goldfinger) from Voltronic. But I tried that in the past and it sucked. Not worth the hassle.

Just a note: in your setup the LV HUB is completely useless. If it is not being used by the inverter nor by the Solar Assistant then there is no point of having it in the system.

Focus on creating one large group and connecting its master to the SA.

 

 

Edited January 31Jan 31 by Youda
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