Just finished my install, but I’m seeing the CT clamp of the Victron having a harder time at keeping import export to 0watts compared to the ET112, Ideally I would like to utilise the ET112 else were but want to keep grid import export to a minimum, grid set point is 0watts. on the clamp it seems to draw 20 to 30watts.
If you search the forum you will find it was discuused comprehensively. I summary, the CT is faster at ramping up/down.
Best to test/compare the numbers from your supplier's actual 30min or daily consumption readings, but expect 0.2-0.6kW being taken from the grid if loads don't exceed the inverter output and top up from the grid.
When I previously ran completely from the CT clamp, my grid set point of 0w was tracked pretty accurately and quickly. Since moving to the ET112 instead of the CT, I still get good tracking to set point but it is a bit slower. Is your CT clamp fully clamped shut? Check for any particles of debris which might be stopping the ferrite cores from closing fully. Also check your connection to the inverter is sound.
The sort of scenario where the ET112 is slower to respond is where you have high loads like a kettle or oven/grill/hob cycling on an off. When the load cycles on it will draw from the grid until the inverter has ramped up, and when it cycles off, you will export to the grid until the inverter has ramped down. With the CT I found this to be maybe 5x quicker than with the ET112. But the ET112 is a better solution in every other way IMO so I'm willing to put up with the slower ramp times. The net effect on my unintentional grid import/export is really very small when taken over the monthly billing cycle.
@Craig Chamberlain ill have a look at the clamp, to see if its fully clamped and if there is anything in between it, but that’s wendesday‘s job now can’t get to it as work at the mo and too late to muck about with it. I couldn’t wait it was nagging me looks like it could have been where I had the Hager flex cable now I have it flat on the cable it is extremely fast at compensating thank you guys now I’ve just freed up the ET112 for the other array when I can get round to it.
