One of the biggest draw back of solar systems is the replacement costs even the best system on the market can’t last for 20 years and the cost never lowers.
The hydrogen combustion engine if far more cheaper than having to pay out for $20.000 battery they has a short life span.
Not much plus of the solar systems even during world war II the Brits had hydrogen stoves the government handed out lasted for years.
For example, my new solar panels I'm having installed will have 10% more solar panel production than my current ones bought a year ago and be only 4% more in cost (costing 6% less per watt than a year ago). My new batteries stay the same cost for the same performance as the current ones bought a year ago. That's even with the crazy inflation and supply chain issues and Brandon making everything else cost more.
My home solar batteries are guaranteed to last 19 years (albeit operating at 50% on the final year) and solar panels 25 years (operating at 70%). The BEV batteries are now costing about $5K to $10K to replace every 10 years (as opposed to me replacing my old used gas cars every 7 years for $8K to $10K).
Hydrogen combustion cars are a fantasy. To my knowledge no one is making them. So if you get a hydrogen car it's a hydrogen fuel cell powered EV. I like an HEV over a BEV (battery electric vehicle) except for one thing: I have no means to produce hydrogen on my own without losing 50% of the energy it takes to power an electrolyzer. That would still make me dependent on government policies for all of my mobility as I would have to buy my hydrogen from someone. Not so with a strong solar system and BEV. I'll buy only about 10% of my power from the power company, all while living comfortably in the hot Alabama weather (read: lots of power consumed to keep my house at 68 degrees) in my two-story house with a hot tub.