question

The CCL does not limit all DC production, that's all it will allow to go directly to the battery.

Sounds like some other setup or installation issue.

Yes, you are right, but if the RS sees on the CAN bus that the Venus tells 70A, it will not generate more than that. It will limit there the current.

The Venus, if the inverter is telling how much needs, should communicate to the RS the sum of consumptions.

Is the inverter also Victron?

No, it is not an Victron inverter. At the moment it is a Hoymiles one. Thats why i had the idea to use NodeRed to send 600W to the Venus / ESS and it will put that on top of the 70A
I could also get the Inverter data by MQTT
So from MQTT -> NodeRed -> Venus
But i dont know which Nodes i need to use

@nickdb

Indeed, as you are saying, according to Kirchhoff's first law, the current will be shared between the inverter and the battery. But that will mean that the 70A will be divided between the battery and the inverter. Because the RS will not generate more than 70A, because the BMS, which is king as you say, is telling 70A and that is what Venus is later communicating to RS.

But I have the impression that he wants the full 70A to go to the battery and additionally some to the inverter. Therefore he needs that Venus to tell the RS to generate the sum of those two.

LE:

Now I realize something... You are saying that if he has "Has DC system" enabled in Venus OS, then the RS can generate more than what BMS is asking and it's published on the CAN bus by the Venus OS in the VE_REG_LINK_CHARGE_CURRENT_LIMIT register?

@cdev

But in the same time, that additionally inverter current you want to add, needs to be continuously monitored and communicated to the Venus and later to the RS, because otherwise it could end up in a situation when the RS is generating more than 70A and the additional current could be dangerously absorbed by the battery, if the inverter "doesn't want it"... But if the BMS is wise enough and doesn't absorb more than 70A, the better.

Through NodeRed I don't know how to do it, but you can modify some scripts inside Venus OS in order to accommodate what you need. The functions you need to tackle are in the /opt / victronenergy / dbus-systemcalc-py / delegates / dvcc.py script. Look for "max_charge_current" variable and how it's processed.

Hi all,
thanks for your help!
To give some feedback - i was able to change the python scrip on the Victron, so that the 70A is ignored and i set it to 85A.

In parallel i was in contact with the Vendor of the Battery - it was not really helpfull because the (1st lvl?) Support did not understand what they are talking about. Th RS232 Port on my battery is defect, but after some testing i was able to communicate with the BMS with RS485.
So i changed the Limitation on the BMS itself also now. OC Alarm was set to 80A and OCP to 100A

I could not find a Limitation of 70A, but i changed the OC Alarm to 98A. Now i can see that the BMS is telling the Victron System a Max Charge Current of 88A
It seems that the P16S100A BMS is using OC Alarm Current -10A for the Communication to the Inverters. And with max 88A i'm fine and i think that is not Critical for the Battery. (0,44C)

I don't know about pylons and your batteries. Anything that spoofs pylons or uses pylon BMS doesn't necessarily have the same characteristics. So the charge current can be very different.

How about DVCC and a smartshunt if you have DC loads? According to the manual, DVCC respects the BMS CCL but adds on the amount needed by the loads. It's not clear if this works with non-victron equipment.

F.

On the DC site i would need a Inverter which can Communicate with the Venus System - the Hoymiles i use at the moment does not Support that.
I'm happy to have now 88A CCL - that should be enough and if i would go to unlimited, it would be not that often over the 88A - so i'm not loosing that much.

What i could do is using nodered to Set the CCL in DVCC
For example, remove Limitation from BMS or set it to 100A or 120A
Than create a nodered flow which set the Limit in DVCC to lets say 95A and get the DC Load from the Hoymiles by MQTT and than set 95A + x A from.