do not get those batteries wet in your car
Its inadvisable to submerge any car, gas or electric.
I have a fried with solar in his home and he is still battling noisy power in his system when on battery power
Your friend obviously has site/product quality/design specific issues. My system isn't designed to take us off the grid in the event of nuclear war, ours is designed to supply the grid with a similar (in our case a little excess) amount of generated power that we consume. We spec'd our system to eventually supply three electric cars as well as potential max usage for a 4,000+ sq ft home.