I think the question is all about cost. How much would it cost to add such a system? And how much is hail damage insurance on those panels? How much does your i

I think the question is all about cost. How much would it cost to add such a system? And how much is hail damage insurance on those panels? How much does your insurance decrease if you had such a system? So long as the system costs more than the insurance savings, it won't be common. However, if your insurer starts demanding it, then it will be installed everywhere quickly.