I have a 8800W (7300W LPG) generator connected to my Multiplus II. I can remotely 2 wire start/stop the generator and it quite happily charges the 4 Pytes batteries through the Multiplus. The problem is though, that no matter what I do, I cannot get the Invertor to receive any more that circa 1500W …

And 20kW battery storage made up of 4 Pytes 5.12kW batteries

Multiplus II 48/5000 has 70A maximum charging current to battery, which is about 3.85kW at 55V Vbatt. So no matter how big an AC generator you connect to the MP II input, you’ll never get more charging current than this. In addition, in my experience the current drops below the maximum as the charge…

Do you have Weak AC Input enabled as it could derate charging output too? Often used with generators if the Multi struggles to sync to a generator.

The AC input seems to be enabled. These are screen grabs from when the genny is running. The odd thing is the input power from the genny has never registered corrrectly in the MPII. Clearly its receiving power but does not display the values correctly. -2W when there is very defvinitely 1500+ going …

Understood and agree with your figures. There was always an intention longer term to get a 2nd MPII but for now, as you point out I should be getting at least double if not triple the current supply.

Hi Ian, fair suggestion. Forgive me, I’m not on site so cannot check. This seems to be suggestion that I need an external current sensor around one of the live cables and thats connected into this input. I am pretty certain there is nothing connected to that input. Maybe I have misunderstood the con…

You don’t need an external current sensor in most cases, there’s already one inside the MP II. The connector allows you to plug in an external one instead which disconnects the internal one when you put a plug into the socket. If there’s a poor contact on this socket (e.g. dirt on contacts) the inte…

Ok, that makes sense now. I assumed it was the 3.5mm plug that was already in place in this socket that had a poor connection. What you are suggesting is that this unused plug may be in a state where the internal sensor thinks it is being used but in fact isnt. I assume mine has this “audio jack” ty…

That’s the latest/current hardware version, the older ones had the jack plug – there’s a photo in the thread I linked to.

Not receiving the maximum power from a 8800w generator into a Multiplus II 48/5000/70-50

Q&A and troubleshooting

iand (Ian Dedic) January 13, 2026, 11:20am 11

A similar problem has been reported before (MP II failing to show AC input current), the cause was the the internal current transformer which measures this was disconnected. There’s a 3.5mm jack socket on the board for plugging in an external CT and this can have a bad contact, plugging a 3.5mm plug in and out a few times fixed this.

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Not receiving the maximum power from a 8800w generator into a Multiplus II 48/5000/70-50

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