@kezo You’re unlikely to be able to install 11KW at home, as the DNO would need to upgrade you to a 3 phase power supply and they’d probably quote you an arm and a leg for it. Best to just install 7KW unless you live in an industrial warehouse or something and have 3 phase already. Think the DNO prices for 3 phase installs range from 1000+
A single phase 100A domestic supply is 23Kva (1ooA x 230V / 1000 equals 23Kva.). Depending on what power factor you use (1 or 0) eauals roughly 23Kw.
The diversaty factor (total connected load / actual maximum load) in other wrds we do not use all the loads at once.
Taking @fwippers tarrif from 9.30pm to 1.30am cheap electricity or throughout the night for that matter, the likely hood of using anywhere near 23Kw is basically zero. Even with the 11Kw charger connected, TV, washing machine on and the likely hood of boiling the kettle a couple of times during those hours, you would be peaking 18Kw if that. Of course thats if you are still awake lol.
I believe Wall box is one company that does 11kw single phase 230V chargers. If I were to go for a 3.6Kw to 22Kw charger (where you can select the charging output) Then I would need a 3 phase 400V supply as they are only manuctured as so. Know this is the interesting bit. Should I choose to fit one of these on my single phase supply, I could install a rotary phase converter. A phase bridge would probably work at a push but one as to remember it would need to be balanced of the neutral.
Going away from all that but taking my first two paragraphs into consideration. A domestic home fitted with a 10.8Kw electric shower, cooker and microwave running at the same time wouldn’t necessarily cause an issue
If the whole street did the same at peak hours potentialy it could necome a problem. The majority of the blame I put with the grid, they new what was coming along time ago yet never did anything about it upgrade wise. Now the easy option is we’ll stick 3 phase in domestic homes. I think with EV’s been new born in mainstream will progress in the future and require higher Kw home chargers.
My meds of kicking in and they make me dizzy, any questions let me know 🙂