I have relocated my Multiplus 48/5000/70-50 from the house to the garage. As this is some distance from the house I have changed from a Current Transformer to using a VM-3P75CT to measure the load. Everyting has been working corretly with the CT.
My configuration is:-
Multiplus 48/5000/70-50 GX
VM-3P75CT
5 x Pylontech US3000
Solax 3700E inverter
Wired connection the VM-3P75CT and wireless for the Multiplus 48/5000/70-50 GX
The background load of the house is around 400W so I was expecting that once the Solar Power dropped to zero that the batteries would start to discharge. What I’m actually seing is - Batteries continue to charge even though there is a background load of 400W. If I apply a large load (kettle) then the batteries are discharged at 3.5Kw and return to charging once the kettle has boiled.
I have a real time app (from octopus) that shows a live use of 1051W, the energy meter is showing 50W although the voltage is 247.7 at 1.9Amp still not 1051W
The usual obvious basics, Have you changed the external meter setting on the Multi when you removed the CT, is the VM-3P75CT set up for single phase and as grid meter with the CT installed with the correct orientation?
Thanks for the quick response - I was up early this morning to have a fresh look at it as opposed to nearly midnight when rational thinking goes out of the window.
I have repositioned the CT clamp (and respliced the cable) connected to the VM-3P as the readings I was getting were varying wildly. The “Grid Metering” is set to externel meter which I did before disconnecting the local CT clamp.
The system now looks the same as it did yesterday morning as in ruler from about 8 a.m. onwards, I will keep a very close eye on it during the day as night time energy is 7p kWh and day time energy is 29p kWh.
Check these and also consider adding a dedicated energy meter for the Solax PV Inverter or even better for your birthday buy yourself a nice MPPT RS string inverter to replace the Solax You have removed the CT and put the jumper back in place or is it an older stereo plug version?What are your ESS settings?
Well spotted - there is a scheduled charging period for 11:30 to 5:30 as long as the battey SOC is below 90%. As the SOC was 96% the schedule (should not have been applied). It was getting late when I took the screen shots. I would have expected a far higher charging rate than 537W.
I would love to buy a nice MPPT RS string inverter - unfortunately the panels are on the house and the inverter is in the garage. I am cosidering some panels on the garage roof and a small Victron inverter in the garage. The CT connection is the later type with a three pin plug, I replaced the jumper as I removed the external local CT clamp.
I have attached the attached the general screen and the ESS summary screen shots.
Since I redid the CT clamp earlier this morning the grid consumption has been effectively flat until the batteries were fully charged and now its exporting about 2.6kW to the grid.
I’ve uploaded the 24 hour perios since I moved the CT clamp and everything is now working as expected.
The consumption from the grid is pretty well ruler flat apart from the period of export and the conditional battery charging betwen 23:30 and 05:30. I also run an ASHP betwen these times but the weather was warm yesterday and only late on in the night.
Overall I didn’t change any of the settings only moved the CT clamp. Extra Pylontech battery US5000 arriving this week.
You have removed the CT and put the jumper back in place or is it an older stereo plug version?What are your ESS settings?
