Thank you @steevc, people typically can't be bothered to plug in, a HEV allows decent economy without the need, yet PHEV is there if you need the 42 mile electric range and your happy to plug in especially if you have a home charger, better economy than HEV dependant on driving style also comes with PHEV.

As for solar do you mean in the vehicle roof or rigged upto the home charger? :)