Willem, I too have been studying and analyzing distributed power and energy systems over the years. A few issues caught my attention in reviewing your Post that you might want to consider addressing in the future:
· The efficiency of solar PV low voltage DC to 110V AC power ‘inverters’ are normally in the 80-90% range. Generally only industrial scale inverters have higher efficiencies compared to average inverters installed with Residential solar PV systems. This factor also decreases the capacity factor of a given solar PV panel array system (max. design generation).
· The same 80-90% efficiency range generally applies to 110V AC to 12-24V DC power ‘converters’ for most EV chargers. I am sure you are aware the most efficient systems are 220-440V AC EV chargers; which also minimizes charging cycle times. Also, the somewhat popular/perceived technology of using EV batteries to supply the centralized Power Grids repeats these energy conversion loss levels twice; which makes the practicality of this technology approach to backup power for variable wind power highly questionable.
· Most ‘off-the-grid’ Residences that require or desire reasonable reliable power 24-7-365 also install backup generators; petroleum or natural gas motor fuels. Even a multi-ton Residential battery system will be inadequate in different geographic locations and times of the year. Based on personal experience, Bellingham, Washington was subjected to 90 consecutive (cloudy) days without the sun one year. Without backup generators, you will be in the dark much of the time in many locations around the world.
· The most efficient Residence, besides insulation, sealing, orientation to the sun, etc. also requires major behavior adjustments to not over heat the house during the winter, over cool it during the summer, efficiently manage external-internal air exchange, not waste hot water, etc. Most of these systems can be automated including external air exchange, but the critical variable is how the Resident programs the system to minimize energy waste. This generally means wearing a sweater in the house during the winter and shorts/’T’ shirt during the summer. And, of course, as Mom use to tell us as kids, “turn out the lights” (when not needed). Even this function can be automated (motion-timer switches more commonly found in some Commercial Buildings).