The only problem I see with the system is the batteries. Instead of lead acid or lithium ion, why not use a hydrogen fuel cell? Take the electricity from the solar array, take that to convert water hydrogen and oxygen and store. Then when you need to use the power you have all the hydrogen and oxygen you need to make clean electricity, and no 'batteries' to pollute the environment!

I've said it before and will say it again, we do that on a large scale (along with in house systems) and we could generate a but load of fuel for our homes and cars, and negate the need for foreign oil.