I now have my BMZ battery being recognised on the Cerbo with its voltage, and the volts (57V) are present at the Multiplus terminals. However I had to power the Cerbo by disconnecting it from the bus bars and powering from an external 12v battery. Cerbo would not power up from the BMZ.The battery is now in a ready phase but the LED flashing lights on it, says it is awaiting communication from the inverter before it does its soft start routine. I switched on the inverter (AC not connected) and inverter on light comes on, but the battery did not go on to precharge the inverter capacitors, and the battery no comms lights are still flashing. Does the Mutiplus need AC as well for the communication between the inverter and battery to work? References I have looked at say no as long as 48V+ present. Seems have a handshake issue somewhere?
Means the MP already has DC voltage. The softstart you are waiting for possibly already happened.
As for the communication, does the battery turn up in the cerbos menu? Did you configure the can bus as bms can correctly?
Yes but inverter not doing anything with it
Thank you. The soft start I do not think has happend because when it does operate, the 2 LED’s on the battery would flash in unison several times per second and the Cerbo would work without an external source. When I leave the BMZ on it turns off automatically when it gets no communication from the inverter when 20 mins have elapsed. No LED’s are lit. (When properly on one LED is permanently lit and steady) When in the current state as reported the 2 LED’s flash together at 1 s intervals which means it is awaiting completion of the handshake. Interestingly if I power the Cerbo off the bus bars then it does not power up and I have only one LED flashing and only get about 7V. Powering the Cerbo with external power so it is functioning then I get 57V from the battery and the 2 LED’s flashing. It seems it is almost there and just needs that final ok. The battery parameters i.e voltage does come up on the Cerbo (but no name) and I have set the baud rate to 500. I have the correct cable type B and have checked that he pinouts are as they should be. I also have the termiator installed.
Not quite sure what you mean by this. Tell me more.
I have also set the DVCC values for CVL & CCL but they made no difference
Communication nweds to be setup between the BMS and the Cerbo. The BMS does not communicate with the inverter directly in a victron system. And on the cerbo you need to configure the can bus according to the battery. As well as using the correct cable. The cerbo uses pins 7+8 while most BMS use 4+5 for canbus
The issue is the comms, the cable checks out for the pins as you state. There has been another development today as I have learnt the BMZ battery itself needs configuring to enable proper communication with inverter. I am a bit stuck now as it needs software on a laptop to couple to the battery to make the changes. There is no UK agent and the battery group of BMZ has come under new ownership in the last few days. I have contacted them from details I picked up on their press briefing. Ever hopeful I get solution would be criminal to write off a high quality battery with another 10 years left in it never mind the cost.
I think I am getting closer to be up and running. Looks like the advice I was given as reported in last posting was erroneous. I have today managed to configure the Multiplus and the MPPT but I am getting a 15 bus error on the Multiplus which is encouraging as at least got something to work on. More importantly is I think that the capacitors have charged up after I did the configuration as the battery voltage has dropped from 57v to 35v too low for comfort and the battery temperature went up to 25C. I suspect that this indicates that a lot of charge has gone into the inverter. But the battery itself is not indicating completion. I have not powered up on AC yet and I do need to get some juice back into the battery. So how best can I do this? With the comms still dodgy the BMS may not control properly, but will the Multiplus not do the control in this situation? What approach should I take and would it be prudent now to switch the solar PV on as well.
Will start another thread on this topic.
That takes a couple of seconds when using a precharge resistor. When not using a precharge resistor it takes fractions of a second.
Do you see the battery on the device list in the GXs menu?
Yes thank you it was after I reset the baud rate. I had previously set it at 500 but after the capacitors charged up I could not see it on the Cerbo so when I checked, for some reason it was back at 250. The battery has populated the Cerbo with some of the values it holds in the BMS. The soft start on the BMZ according to the manual can take 30 secs to 2 mins to charge up the capacitors. I did not notice it happening other than I clocked the battery temperatue at 25C so it had done some work. Back to 12C today. Having got the MPPT working the battery has charged yp to 100%. I am happy now that that bit of the comms is working I think that the new topic I have posted will hopefully result in a simple solution also.