Another piece of puzzle that doesn’t get enough attention and or clarity is that many BEVs charged at home are done at night when solar doesn’t contribute much. Sure, there is some battery and other storage systems, but presently natural gas still powers most of the marginal energy consumption. Unfortunately we are still a long ways from powering most BEVs with renewables. We do have nuclear power technology available today, but it’s expensive and scary to many. It’s a proven way to generate electricity with minimal GHGs, unlike what China has done to power large numbers of BEVs with coal-generated electricity.
At present gas costs in my area, one can buy ~ 4 gallons of regular for same $10, and driving an Accord or Camry hybrid, it would get approximately 200 miles of range. Fact that hybrids have improved so much, and gas prices have remained so low, has made financial justification for BEVs much less attractive. Granted, gas prices in some areas are much higher, and charging BEVs at home is generally cheaper than at Tesla Superchargers. Still, promised savings are not what was initially projected.
As example, if I enter Tesla site, it still projects significant energy cost savings in order to help justify higher cost of their cars, but that number must be based on comparison to gas guzzling options, not newer hybrids. Funny thing is that as hybrids become more efficient and help reduce gasoline demand, that will drive fuel cost even lower; at least in the short term.
As an upside, I get gasoline, hot water, hot meals, and home heating in return for the money I give them. I think that until we can engineer near eternal battery design such as nano diamond technology (theoretical life of 26,000 years), solar won't be the Final Answer. The other shoe to drop is devising a practical, fair and simple way to tax energy for vehicle use and/or BEV, PHEV, EREV H2EV's etc themselves; roads will always need to be updated and fixed, and at some point, federal and state fossil fuel taxes aren't going to be enough.
Same reason you give your money to restaurants and grocery stores instead of raising your own animals and growing your own crops. It’s more convenient.
It is a pretty cool feeling to plug our Mach E in when the sun is shining and channel that energy directly from the sun through our solar panels and into our Mach E. Side note...even with our Mach E, our electric bill for our 100% electric home was $34 last month, all of which was the connection charge. We actually produced 73 more kWh than we used in May. It cost $10 just to add 100 miles' worth of Tesla fuel.