If you can find the answers to these questions, you'll be at the forefront of the break thru in solar power conversion.
WHy do you think that solar power has not taken off like oil based power sources? Simply a Lack of development and lack of AFFORDABLE power conversion/storage potential
All these tree huggers and politicians look at solar energy conversion as some sort of panacea. It is and always has been a difficult power source to store and convert to useable WITH THE KNOWN SORAGE and CONVERSION DEVICES
THis is not so say that it can't be done, I"m just saying that none of the methods used so far are as cheap or effective or efficient as the inefficient fuel power energy conversion devices we use now.
It is funny that you mention this sort of thing. I had a similar question asked on/in a mechanical engineering final exam I had nearly 40 years ago. The more things change, the more some things stay the same - sp,e [rpgress jas beem ,ade bit mpt empigjt tp compete with $5 or even #100 per barrel crude..