Some years ago I lived in a touring caravan while working on the building of Sizewell power station, the site was designed for mainly static caravans used only during the summer months and the supply to each caravan was just 6A, we paid a fixed fee for electric so wanted to use as many items as possible electric powered rather than gas, and we found all sorts of methods to work with a 6A supply, my under sink water heater had a relay so when it demanded heat the modified fan heater (500W and 1000W) turned off, and both were turned off to use the kettle.
I am sure our houses could be modified to load share and using the shower would auto turn off the charger, this would likely produce a challenge for the charger designers, the old NiCad batteries used a constant current supply and sensed when voltage peaked and dropped which would happen just as the battery became fully charged. Removing and replacing the supply to these old Delta V chargers would either restart the drain then recharge so causing the battery to go flat, or over charge the battery.
Putting old 2 way radios in the charger while in use did not work very well, however this is done with phones on a regular basis. The chips inside laptop batteries have caused non genuine batteries to fail as they don't talk to the PC in the correct manor. In essence some chip remembers the state of charge so it can be stopped and resumed without problem, however likely we will need the charge rate to step up and down to match power used in the rest of the house so keeping total power used to below the limit where the supply fuse will rupture.
Having solar panels could also help, no reason why solar panels should not directly charge the vehicle battery in the way they charge a caravan battery today. The problem would then be you need the car at home during the day, or a second set of batteries again just like used in our phones, I charge up a battery pack while I am out, then when I pop home take that charged pack out with me and charge the phone while it is sitting in my pocket. We could do that with cars, charge up batteries with solar panels during the day and use inverters to transfer that charge to the car over night.
Since batteries are expensive this would be last resort, however it could be done.
What seems odd to me is no solar panel on the car, OK it will not power the car, but if you don't quite make it, you could leave the car and catch the bus and return next day to get it home, as it stands cars need to be recovered if the battery does not last long enough, even a small 1.5 kW generator built into the car would extend the range and mean every time you leave the car the battery could be topped up.
Where my son works there are two charging point, and three people with electric cars, who get to work earlier and earlier to get the free charging point. Once there are 50 electric cars looking to use the charging point it will become rather pointless having one.
