What set-up would I need?: 3 Phase Supply and SMA Solar Inverter

Hi, I have a three phase supply to my house, with each phase supplying a different part of the house. I have two new solar arrays totaling ~10kw feeding into a Sunny Tripower 9000TL-20 SMA solar inverter. 

I would like to be able to monitor my solar production, usage, net usage, total exported etc.

What emon set up would be best? 

Robert Wall's picture

Re: What set-up would I need?: 3 Phase Supply and SMA Solar Inverter

Unfortunately, an emonPi on its own is only able to monitor two current channels, therefore you need an emonTx (running the 3-phase sketch you download from GitHub) to be able to monitor all 3 phases of your grid connection.

We know about SMA inverters - see http://openenergymonitor.org/emon/buildingblocks/interfacing-with-sma-su... - so hopefully you would be able to use that with the emonPi, or a Raspberry Pi emonBase, to record the data from the inverter (though you might need to confirm that with Stuart Pittaway as his software predates the emonPi by a long way).

If that isn't possible (and I guess your inverter is a single phase output?) you would need to monitor its output either with the 4th emonTx channel or with one of the channels on the emonPi. If the inverter is 3-phase, you're looking at a second emonTx and a RPi as an emonBase instead of an emonPi.

Solar production is then the inverter output, usage is the sum of solar plus grid, nett usage is the grid power, and total exported is the negative part of grid power.

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