I’m not convinced that building a combined unit for solar and hydrogen production is more beneficial than having separate components. You are inherently limited

I’m not convinced that building a combined unit for solar and hydrogen production is more beneficial than having separate components. You are inherently limited by the lifetime of the least durable component. Having them be separate lets you replace whichever component fails without needing to replace both. The electricity for a rooftop solar panel can easily be run to a ground-based hydrogen generator. The hydrogen component surely increases the weight of the unit to more than a plain solar panel so installation would be harder and overall weight on the roof greater. If the hydrogen generator needs maintenance, it would be much easier for a ground-based unit than rooftop units.