Hi Robert, thanks for replying so quickly!
Do you mean the import c.t. agrees with the pulse rate when you are not generating, but the pulse count is static when you are exporting?
I think that the import CT appears to agree with the pulse rate when not generating, and sometimes randomly when generating, but at other times (when generating) the import CT shows no import, but the pulse counter is still recording pulses!
I do have an AC adaptor connected, it is working, and the meter box is fairly dark (not 100% because it doesn’t close properly with the emonPi cables jammed in the door!). I don’t have a diverter. I have the My Solar dashboard set up and, since it uses the CTs and not the pulse counter, it seems to make sense. But I’d like to double-check the CT readings using the pulse counter.
most meters show a steady red LED or nothing when you are exporting
If the red LED was flashing on and off, that might explain it, but it looks to me as though the meter is pulsing for export too. Unfortunately I can’t find a manual for the meter (Landis+Gyr E470) online to check whether it’s supposed to.
The CT measures zero when exporting because I applied the default settings for a Solar PV system, which include filtering out values < 0, to prepare the import CT sensor readings for the My Solar app:
I’ve since created a raw feed that doesn’t do this filtering, and we can see that when the import power is greater than 0 (net importing) then the instantaneous power derived from the pulse counter matches it very closely, and when the import power is less than 0, the pulse counter power shows the exact opposite:
I take it that this is very unusual and not supposed to happen? I can see that some meters have a mode called “Import meter with Power Flow Insensitive enabled - The LED pulses for forward and reverse energy”. Perhaps this meter does too?
I’m going to try to setup a feed for the pulse counter that inverts when exporting, to see if that makes it align correctly with the CT, as I suspect it will.