That would depend on their long-term plans to stay in the home or are they considering a move or upgrade within several years. Also, they want peace of mind with a battery backup for power outages, short or long-term.

Panel sizes vary, so putting in an exact amount isn’t easy. However, the panels rated wattage converts approx.. 82% to usable Kilowatt power.

They do. However, production would be much less than if they were in full sun.

No. They need UV or direct sunlight.

Most manufacturers warranty their panels for up to 25 years. However, the panel’s cells will degrade with time, produce less energy, or become less efficient. I am told the panel should last up to 40 years based on the site conditions.

Depending on the efficiency of your a/c equipment, some units have a slow start and have almost no inrush power spike to start the compressor; with that style, we would say yes, overall load needs would have to be calculated. If you have dated equipment, an upgrade may be required to achieve that.