I have recently purchased and setup some emon gear and clearly need advice on how to set it up correctly. I have an emonpi and 2 x emontx. I purchased plenty of CT clamps (one for each device input) which is probably too many. When I ordered them, I requested both emontx be supplied with the three phase firmware and each has a unique nodeID.
I’m in Australia and have three phase mains power and also three phase off-peak/controlled load for in slab heating (both three phase setups have their own smart meter). I also have a 10kW solar system with two Sunny Boy inverters.
When I was ordering my emon gear I assumed that I needed the following:
1 x emonpi to monitor the Solar inputs - two CT’s (one to monitor each inverter)
1 x three phase emontx to monitor the main three phase usage - 4 CT’s (to monitor each of the three phases + neutral)
1 x three phase emontx to monitor the off-peak three phase usage - 4 CT’s (to monitor each of the three phases + neutral)
I was hoping to sum:
- the two solar inputs to give the total solar generation
- the three mains phases to give the total mains usage
- the three off-peak phases to give the total off-peak usage
- total mains usage + total off-peak usage to get total household usage
The goal was to feed the above data into the local emoncms My Solar App to provide a view of current use, solar generation and thus how much we were importing.
My electrician has kindly drawn up the attached diagram for me to help me get a view of the meter box wiring. As an initial start we have added the CT clamps as shown in the diagram.
I am getting readings from the CT’s but the numbers seem very low for both usage and solar generation.
To start simply, the other day the two CT’s that are monitoring the two solar feeds were showing a combined total of 410w:
At that time, the two inverters were showing 715w and 826w each:
I did see the Type 1 and Type 2 sensor installation diagrams (here https://guide.openenergymonitor.org/applications/solar-pv/) but I don’t understand how they relate to my multi-three phase and solar wiring.
I am really unsure how I should be setting up the CT’s and I’m hoping the community can offer some guidance on the right way to setup my system.