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marommel avatar image
marommel asked

correct MQTT topic for power in/out Multiplus in ac coupled ESS setup

Hi,

I'd like to know which MQTT topics are the correct ones to get the power to/from the multiplus II. I've go a setup like that (the picture is just missing the cerbo gx):

1681665560465.png

I'm considering victron/N/myID/vebus/276/Ac/ActiveIn/L1/P or .../S. What is the difference P vs. S? And are these measured or calculated values?

If the battery is discharged, the values are negative else positive and they seem to be "W". But the values doesen't fit to the one shown in the dashboard:

1681666062070.png

Is the value shown in the dashboard power in/out at the battery and the difference the loss?

Thanks a lot,

Markus


Multiplus-IIESSMQTT
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1681666062070.png (42.0 KiB)
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1 Answer
nickv avatar image
nickv answered ·

Hi Markus


If you have the AC power meter as shown in the diagram then you'll find it's data at a different path. My ET112 appears at N/myID/grid/30/Ac/Power

Otherwise, I believe P is the true power in Watts and S is the apparent power in VoltAmps. The difference between the two is reactive power used by inductive loads. This might help explain more detail
https://www.victronenergy.com/media/pg/The_Wiring_Unlimited_book/en/ac-wiring.html#UUID-58ef59a4-8ce3-16c1-2cfe-01bc3a723908

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