And the homes they’re going into are mostly 3 phase? So it’s up to the installer to just randomly pick a phase?
In these parts most houses are single phase, and PV and EVSEs both need to be registered with the provider. They do remote monitoring of the local distro transformers and every few years will move houses from one phase to another to help balance things.
Homes can be either 1 phase or 3 phase. Yes, it’s up to the installer to pick a phase. General procedure would be to pick the phase with the highest voltage, but that’s just guesswork in the end.
So a simple test to see if there’s any low hanging fruit there… when you detect V dropping below 207V are the other two phases down that low also, or are they still up around 230V?
That can’t be measured unfortunately
Depends on the power. Vaillant’s devices are single-phase up to 7kW and 3-phase above that.
Are you able to zoom in on the x-axis there, maybe just show 2 or 3 days, and on the y-axis if you leave “Total” out and just display the 3 phases it might hopefully zoom on that axis too.
It’s hard to tell at the posted scale/resolution but it looks like the green phase might have the biggest excursions in both directions. How many homes does that represent? And which way is the meter facing, i.e. does + mean the neighbourhood is producing or consuming?
I assume “low voltage” is relative to a Grid engineer! What voltage is that - 11kV or thereabouts?
Around these parts at least, I think the LV network refers to the final 400/230V stuff that connects to houses, basically anything below 1kV.