Thanks for all the advice so far!
I’ve signed up for the professional site, watched a few webinars and read a few more of the guides.
AC-In is bi-directional unless the grid fails (which thankfully is extremely infrequently in South Wales), so I should be fine for 99% of the time on AC-in, I think I’ll wire AC-Out 1 as well unless there’s a good reason not to.
I still haven’t been able to track down a clear wiring and configuration guide for the Multiplus-II GX for an ESS system. Specifically the wiring of an CT sensors or energy meter.
Is a CT meter enough for monitoring grid load or do I need an ET112? If I need the ET112, can I combine the sense cables into one Cat6 cable for the EVC sense?
The Multiplus-II GX Manual’s Appendix seems to show that you’d connect the CT Sense cables to the External Current Sensor (K). If so, what can the Aux Analog inputs be used for?
I think I’m going to mostly rely on scheduling / home assistant for automations, but I’d prefer low-tech / more tightly coupled systems.
This is my current plan.
Other questions from the thread:
Unfortunately, I can’t have solar as we have a small south facing roof area, as property is mid terrace with a gable front end. Garage roof is too weak to support solar. And we’re in a conservation area with an article 4 directive so would need full planning permission, which is a lot of faff for a very small usable solar area.
@Daza The single radial is a 10mm2 armoured. Qualified electrician as done the maths, details are in the diagram.
@Mysik thanks for the validation! My calculated savings are between £850 and £1200 per year. Which, with this solution is 4 - 6.5 years RoI. The last time I looked into it the RoI was >10yrs (that was a while ago). I’ve had a few quotes from managed installers and they come in at almost double the cost.
Later in the year (when PHEV arrives) I’ll go to Intelligent Octopus Go. IOG makes the scheduling a lot easier, but there’s always the temptation to use Agile and play with the half-hourly rates and Victron’s DESS system (which does support Octopus)