I’ve had 2x 48V 5000VA Phoenix inverters running in parallel over VE.Bus with a BMS v2 for a while without any issues. I monitor it on the VRM portal via a Raspberry Pi running Venus OS Large. It’s all off grid.
The power output when I boil my kettle was shown in VRM as 2600W which is correct. This is using the display parameter Output Power 1 in the standard widget for the inverters connected to the BMS.
I installed a 300A SmartShunt a couple of days ago and the output power on the Advanced screen in the VRM portal has dropped to 1300W when the kettle is on. The SmartShunt is showing the correct current draw (50A @ 52VDC). I suspect there’s a bug in the system somewhere which results in only half the total power of the two inverters being displayed but I don’t understand why it would happen when the SmartShunt is added. Any ideas?
To be clear, the power is wrong everywhere (VRM dashboard, console and advanced widgets on VRM and Node Red dashboard). The current and voltage are correct everywhere but the power is half what it should be everywhere. So I created a Node Red flow to multiply voltage by current to display power correctly on the Node Red dashboard.
When I fitted the smart shunt I turned off the batteries at the isolator switches which removed power from the busbars, which powered down the inverters and the Raspberry Pi. It was night so there was no solar. I can’t remember what order I turned off the inverters - I probably switched off the master then the slave with their front panel power switches before switching off the isolators. When I turned it all back on the Raspberry Pi would have come on first when the busbars became live, then I would have switched the inverters back on. I’ll do it again but get the inverters back on in the right order before the Pi and see what happens.
@lxonline you, sir, are a genius. I unplugged the RPi, switched off the slave then the master, turned off the VE.Bus BMS just to be sure, then switched on in the order you said and it is now all good. Thank you.
