We want to add battery storage. We have a problem in that we have a three phase supply.
We already have a single phase PV system feeding just one phase. This works without issue as our meter correctly sums import and export. We propose adding a single phase battery to one of the other phases. The problem is that apart from Tesla who can monitor all 3 phases with 3 CT’s on their single phase battery system all the other manufacturers seem to have a single CT
2 suppliers have advised that they have users who have a single phase battery on the same phase as the solar.
However I am not happy with that idea as our single phase usage is split across all three phases. We could have the distribution box rewired so that every thing is on the same phase as PV and battery but that would be expensive.
Our favoured system is the Lux AC with Pylontech batteries. This is much cheaper than Tesla and there are a number of Octopus Agile customers who are very pleased with the same setup.
The Lux has 2 CT’s. One monitors the PV generation and the second the mains supply.
I am thinking on the lines of somehow monitoring the three phases and producing a current output that is the sum of all three and feed that into the Lux.
Am I correct that if it were physically possible and I could have a very large CT with all 3 incoming cables passing through the result be what I am after? IE 2 phases importing and one exporting I would see the correct result.
Alternatively I did wonder if Robin Emleys 3 phase solar diverter could be used as a basis of what I can best describe as a single phase emulator using 3 CT’s on the individual incoming cables.
Any input much appreciated.