Hi all, I am struggling with getting accurate data on a particular feed and I hoping someone sharper than me can spot what I am doing wrong.
We’ve heavily bought into eMonCMS. We’ve got an emonPi + 2x CTs, 1x EmonTX + 1 CT and 1x EmonTX + 3 CTs. So 6 clamps in total.
Here’s a diagram. The areas of interest are the main incoming CT, the office CT and the solar CT.
It all has been working fine - until we added solar.
We’ve got graphs showing total usage and office usage.
The main incoming graph (second graph) goes negative as we generate excess solar.
Here’s usage vs generation for today
Another graph from the Solar App
So here’s the problem I have - I’m convinced it is an emon monitoring issue - The office kW goes up as solar generation goes up.
This graph is from today (however every day is the same) - as solar goes up, the office usage goes up - this isn’t really the case, there are no devices in the office that would increase usage as the solar is generated (it ticks over about 300w). Shutting the inverter off causes the office usage to drop back down to the 300w tick over.
The second and third graphs higher up show the solar working as expected and feeding excess back to the grid, however this office graph doesn’t show that, it shows we use more as we generate more
The lines are almost identical in some places.
So I am convinced I’ve got either the hardware setup wrong or the software not configured quite right.
My vague idea is that CT2 on the emonTX in the house is reading the office current draw and somehow double counting the solar feed in? Not sure if that is a thing.
Can anyone spot anything that I am doing wrong?