Hi - I’ve looked around for an answer to this but couldn’t find it. Thanks to helpers on here earlier in the week I’ve got an emonpi setup (using a raspberry pi v2 I had lying around plus a new emonPI shield and clip on CT sensors and voltage sensor from the shop). All seems to be working reasonably well - few wrinkles to work out. It’s a really fantastic piece of equipment. In the end I squeezed the CT sensor for PV inside the consumer unit. I’m on emonSD from oct2018 (only had a 8gb SD card to hand).
Overnight I noticed that PV production shows a minimum of around 25W (see image) and assumed this was probably interference on the CT due to being jammed in with other wires etc. However I was just investigating and have the Pi on my desk with the CT clamp attached but hanging free and it still registers around 25 to 30W. If I put it in port 1 or 2 I get pretty similar behaviour. Is this normal? I only have a few PV panels at the moment 680W so this will have a meaningful impact on my measurements (particularly on cumulative power since it’s present 24 hours a day). Note if I unplug the CT sensor the reading does drop to 0. Any ideas? Thanks!