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rv112 avatar image
rv112 asked

Multiplus-II shut down with PV inverter

Hallo!


My setup is as follows:


MultiPlus-II with 2,4kWh Pylontech LiFePO4 battery module. AC-1 out is connected to the loads AND the PV inverter (Zeversolar). See here:


xmgtop2.jpg


I turned on the MultiPlus-II with the switch to I (what is II?) and the battery is getting charges fine. Also the PV inverter is charging the battery. After battery is full the MultiPlus-II shuts down and "battery low" and "overload" LED's are on. If I disconnect the PV inverter the same thing happens but without the two red LED's.

Is there anything I have to setup in software? I'm using this system pretty much out of the box and only setup the correct battery type (LiFePO4).


Thanks in advance!

Multiplus-IIVRMPylontech
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2 Answers
marekp avatar image
marekp answered ·

One position of the switch is for charging/inverting and the second just for charging only.

When you have your PV inverter on the AC-out and load is lower than the PV production, the battery is getting charged up to full and at that point ecess PV should go to the grid. But if there is no grid PV inverter have to lover it power production.

Normally MP is controlling PV inverter by frequency shift but you need to load a assistant for it.

Assuming that your Zeversolar will understand the frequency shift as a signal to lower its production.

If not, the battery will be overcharged and the system will shut down.

Battery will not get overcharged if you connect PV inverter on the AC-in side of the MultiPlus.

Assuming that you can feed the grid with your excess PV power.

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rv112 avatar image rv112 commented ·

Thanks for that. Do I need to enable frequency shift at the MultiPlus-II?

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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

I think you have much to read now:
https://www.victronenergy.com/live/ess:start

https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

With the default charging parameters you can kill your batteries.
Default is 57.6V but maximum for Pylontech is 52V.

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rv112 avatar image rv112 commented ·

Hallo Matthias, danke. Ich habe aus diesem Grund den Batterietyp auf LiFePO4 angepasst, in der Hoffnung die korrekten Ladeparameter zu erhalten.

Ich habe zudem das CAN auf VE.Bus Kabel, welches mitgeliefert wurde verbunden. An der Batterie am A/CAN und am MultiPlus-II am VE.Bus Port.

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