All through the commissioning of my system I have had to power up the Cerbo by an external 12V battery. The reason is that when my BMZ battery is switched on it does not provide enough volts to power the Cerbo for it to establish the communication to the system and for the battery to fully power up. Now the system is up and running I can rely on the BMZ battery to provide the power. (until it switches off which it will do after no comms for 20 mins.) I have made up an external bus bar taking power from the system to provide power to a DC-DC converter to power the Lynx distributor LED’s. I was thinking that I could wire into that external bus bar a changeover switch to link an external 12V battery to the system at start up and once comms established switch over to the systems power and battery can be taken away. I wonder if this situation can be common as I have read a Victron comment not to power a Cerbo from a mains adapter as at power outage system will go down. Anyone got a neater solution.
Not used BMZ but have with manufacturers that need the keep alive to switch on.
Usually the cerbo will power on from the dc side if an mppt switches on to black start recover.
Mppt will also precharge the inverter and help with the battery cold start.
I have not heard that tern before what does it mean
Black start is the system self starting (unattended start).
Can be from a low battery occurrence. So a total power blackout.
A second way is generator or grid input on AC1 that usually wakes up the inverter.
There have been a few systems where things haven’t worked as they are supposed to, but one to two tweaks in settings to adjust for the curve balls and everything is golden.
Thanks for the explanation. Coincidentally I came across that term today whilst I was looking for a solution to my current issue. Context was starter battery on a boat. Did not find any inspiration in it and I cannot find a suitable MBBB switch which would do the job. Thought at moment is to hard wire the Cerbo to the external bus bars with a Wago terminals or similar attached and plug in the battery into them at any fresh start-up. Start up the BMZ when comms established remove battery. At moment what I have got is untidy with flying leads and crocodile clips so need to make a permanent install.