True, you can't put solar in your car. Unless you drive an electric car and power it with solar.
Storage is for sure an issue. For now, most people are using the grid for storage, and it will be a while till that becomes an issue. In the meantime, I'm reading every day about advances in storage technologies. And a recent study found that using a mixture of distributed renewables and storage, by 2030 we could power a large electric grid with renewables 99% of the time: https://joinmosaic.com/blog/renewables-100.
Solar was the subject of my post, but that doesn't mean I think we can rely on it alone. I believe we can go far, though, with a mix of disributed renewables.