He is in LONG ISLAND. That is NOT a place with a lot of sun.
The Mohave desert - 7.7 kWh/m2/day.
Montpelier, Vermont - 3.43 kWh/m2/day.
Long Island should be in the 3.4 kWh/m2/day range. Perhaps less due to being on the coast.
Assuming 15% efficiency of the cells, then the harvest is about 0.5 kWh/m2/day.
I wish you could tell my sunburn that! :(
It definitely would not pay for itself in any reasonable length of time.
Have you thought of installing a wind turbine near New York’s city hall?
You should be able to generate enough power to pay for it.