I’ve been using a myenergy Eddie, with a wired CT import/export clamp. I’ve been very impressed it seems very accurate and responsive. Unlike some solar PV diversion solutions the Eddie is a pure sine wave
Here’s a graph showing the unit in action heating hot water. About mid-morning the hot water reaches it’s set point then switches off
The Eddie wired CT seems to be very accurate in tracking export and diverting the surplus to the immersion. I would be interested to see a similar graph for the Harvi wireless CT version to see what the difference is?
The Harvi does not have any power supply or batteries, it’s impressive how the Harvi harvests required power to run the unit, the unit must have to be very low power and not have a particularly high sample rate and the VRMS voltage will have to be sampled at a different location on the Eddie