question

Hi @Duncan.Gardiner

I'm not familiar with this brand but I had a quick search and found some manuals that might help:

Rosen-48V-200AH-LiFePo4-Battery-Powerwall.pdf (energyserv.ie)

photovoltaikforum.com/core/attachment/228535-rosen-48v-lifepo4-battery-powerwall-user-manual-006-compressed-1-pdf/

Assuming i've found the right battery manual, it looks like the batteries are 15 cells each (similar to pylontech). I personally set absorption to 3.45v per cell (3.45*15 = 51.75) and float at 3.375 (3.375*15 = 50.625).

However the spec sheet in first link has some less conservative specifications. (Note my settings are very conservative, a lot of folk will set 3.55 per cell for absorption)

In regards to your question on only one can port vs rs485 issue it looks like you daisy chains the batteries using RS485 and then to connect to inverter you use CAN. At least that's what's suggested on diagram using growatt inverter as an example. I'm not sure on victron compatibility but it is noted in the manual via CAN so assuming I've found the right manual it should work.

In regards to your router crashing when plugging in GX device via ethernet. It sounds to me like a DHCP issue, maybe where GX device is using an ip that is already in use or even on the wrong subnet. When you're connect to wifi you may want to try setting ethernet ip manually to an ip you know isn't taken on your network. You can do this in settings-> ethernet -> and change ip configuration to manual and enter the information yourself rather than relying on router DHCP server to assign the IP.

Ok here is a final note to describe what worked and how I got to the correct place. Also highlight what I got wrong.

Firstly its all up and running. I have the RosenPV batteries communicating between themselves. I have the RosenPV Batteries communicating to the VictronGX via the BMS-CAN port. I Have my RS MPPT 450/100 Tr Charge Controller communicating with two arrays of panels independently. The RS MPPT 450/100 Tr is communicating to the CebroGX via the VE_CAN port, and I have the Victron MultiPlus 48V8000 communicating to the CebroGX via the VE-BUS.

The easy bits:

As long as you build a solar array to the specifications of the Victron RS 450/100 TR Charge Controller (mine are an array of 9 550w panels at 41.96V(Max Power) and 13.11A(Max Power) and an array of 4 panels 550w at 41.9V and 13.11A). I plugged these two arrays into the RS MPPT 450/100 Tr via a DC disconnect break box and it just recognised everything and started using it.

The Victron MultiPlus 48V 8000 Inverter setup. Basically all I had to do was make sure the AC out port was not sending more than 50Amps, as houses here in Portugal have a main fuse of 40Amps for residential.

Connecting to the RS MPPT 450/100 Tr via Bluetooth. it just works and Victron connect makes the rest easy.

The CebroGX, set up and connecting to Victron VRM (once I had internet configured on the CebroGX.

The not so easy bits:

Getting my CebroGX to connect to the internet. My LAN connection still is not working. Whenever I plug in a LAN cable to this CebroGX, my router packs a massive sad and my internet for the entire house dies. On a plus note I learnt many interesting Lithuanian words to call Victron from my wife, while the internet was off. Once I got past my stupid Bluetooth mistake i did get the Wi-Fi connected, but it took several tries.

Where I went mostly wrong with my initial connection to the CebroGX was connecting my phone to Bluetooth to the CebroGX directly, before I had the Victron Connect app running. Dump mistake on my part. Android seems to grab the Bluetooth connection and will not let go, so and when Victron Connect tries to communicate with the device, it gets another phone is already connected error.

CABLES! I used the blue Victron cable to connect my Multiplus to the CebroGX on the VE-BUS which is correct. However I did not pay enough attention to the blue cable I used. It was a BMS-CAN cable type A so not configured for that purpose, BIG MISTAKE. Hence the CebroGX not being able to see the MultiPlus 48V8000 inverter when I powered it on. The MultiPlus 48V 8000 inverter communicates via a standard LAN CAT5e or CAT6 cable, once I figured out this error once you have the CebroGX running plugging in the MultiPlus via the VE-BUS immediately has it pop up in the CerbroGXs device list.

The RS MPPT 450/100 Tr Charge Controller, communicates on the VE-CAN port. the documentation states both ends of a VE-CAn needs to be terminated, this in my case turned out to be not true, with only the second port of the CebroGX needing the Victron Terminator. Plugging in a Standard LAN cable to both the CebroGX and the RS MPPT 450/100 Tr and terminating at the CebroGX end is enough to have thee two communicating correctly.

The RosenPV. Lets start with OMG their documentation and customer support is F^$%$ SH&^& !

The Powerwall 200A 10Kw batteries I have need the following.

1. The internal configurations setting need to be changed. I was not able to do this alone. All you need to connect to the Batteries BMS is a converter cable they supplied and the Pylotech BMS software. However RosenPV have locked their BMS with a password.
2. So I had to email them loads of times to get an engineer to come onto my laptop (yes I know very likely the Chinese gov has complete control of my laptop and bank account now). So he could unlock the BMS and change the Inverter protocol settings to:
   1. CAN Protocol to Victron_CAN
   2. RS485 Protocol to Pylon_485
3. With the BMS setup. if you have two Batteries like I do, the DIM switches need to be set accordingly:
   1. Master Battery DIM to 1000
   2. First Slave Battery DIM to 0100
4. Cables:
   1. I used a short Standard LAN patch cable it needs to go from Port 1 RS485 on the Master (leavening Port Zero empty, this tells the BMS its the Master Battery, something the bloody RosenPV guy did not even know!), to Port Zero of the RS485 on the first Slave Battery. If you had a third battery it would go from port 1 on the First Slave to port zero on the second slave and so on. Based on the Pylon Tech documentation I believe a chain of 14 batteries is the maximum
5. From the CAN port on the Master RosenPV battery you plug in a Victron Type A cable. Polarity matters people read the cable. I got this soooo wrong so many times. The Victron end goes into the CebroGX via the BMS-CAN ports and the end marked Battery goes into the RosenPV master battery's CAN port.
6. The Victron BMS-CAN port needs to be terminated. This also kicked my ass for a long time. I was under the miscomception that only the VE-CAN needed terminators. But NO, the BMS -CAN also uses one. I discovered this after watching avery helpful german guy on you tube tlak about PylonTech batteries and Victron CAN. Link here [Part 1] Connect Pylontech Battery to Victron Multiplus II . Ignore that fact he is using a MultiPlus the title he actually is using the CebroGX Can. In Part one he builds a Type B cable (I did that, it does not work with the RosenPV batteris). In part 2 he builds a TypeA, this works!. And then ofcourse I discovered I had a proper Victron Type A already just connected to my MultiPlus (IDIOT!).

Ok with everything cabled correctly. The CebroGX seeing all my Victron and RosenPV devices. It actually sees the RosenPV batteries as batteries called 'LEOCH' but at this stage I can see SOC the other Battery stats I need to move forward.

The Following photos should show what I have just described above.

Ok from Left to Right:

• The Victron Type A cable - the Victron end in the first BMS CAN Port, going to the CAN port of the ROSENPV Master Battery
• A Victron Blue Terminator in the second BMS CAN port
• A Victron Blue Terminator in the first VE Can Port
• A Standard LAN CAT5e cable going to the VE CAN port of my RS MPPT 450/100
• A Standard LAN cable in the first VE BUS port going to the VE Bus of the Victron MultiPlus 48V 8000 inverter.
• A very empty LAN port Booooo Victron Booooo!

Some Additional Detail:

Here is a photo of my now Master Battery:

• Note the Red Dim switches:
  • Switch 1 on first from the left up = 1
  • Switch 2 on second from the left down = 0
  • Switch 3 on second from the left down = 0
  • Switch 4 on second from the left down = 0
• RS485 in CAN section - is empty
• CAN Port has the other end of the Victron Type A cable (The Battery end as marked)
• The 232 port this is where the converter cable the RosenPV engineer has you connect your laptop to when he makes changes to the BMS
• The Left most RS485 port (Port Zero). On the Master battery it must be empty as per Helmut's description of PylonTech to Victron Can set up.
• The Right most RS485 port (Port 1) has the short patch cable ( a Standard LAN cable just a short one) connected to port 0 of the Slave battery just above out of shot.

The Money Shot!, all my device being seen by the CebroGX and communicating with each other.

A Type A cable PIN-OUT and yes you only need 3 wires from a 8 wire LAN cable to make this work. Its fiddly to make yourself but I did it and I am an Idiot so you can too. Or just use the Supplied one Victron gives you as I eventually did, after much swearing building my own first.

And just to prove Victron VRM sees things too.

Now I need a massive lay down, and possibly a big drink!