Assuming they are going to use roughly half that range or 34kWh per day a solar roof getting roughly 1/2 of an optimal 8 hours * 0.22kW/m^2 * ~11m2 ~= 9kWh per day, isn’t nothing but hardly enough on it’s own.
Where solar roofs might be beneficial is simply reducing the number of charge/discharge cycles on the battery. A hypothetical 25-50 fewer full charge discharge cycles per year could be a full battery replacement they avoid.
Assuming they are going to use roughly half that range or 34kWh per day a solar roof getting roughly 1/2 of an optimal 8 hours * 0.22kW/m^2 * ~11m2 ~= 9kWh per day, isn’t nothing but hardly enough on it’s own.
Where solar roofs might be beneficial is simply reducing the number of charge/discharge cycles on the battery. A hypothetical 25-50 fewer full charge discharge cycles per year could be a full battery replacement they avoid.