I don’t actually know.
The company owns the panels and I pay them a fixed monthly fee. They guarantee that the panels will provide the power for the house and do all the maintenance.
Note: Electricity prices on Guam are three to four times more than than average in the US. So it is not a normal market and makes solar cheaper by comparison. If we used AC in the whole house (1800 square feet)the power bill would be easily $400 to $500 a month.
Plus the power here is unreliable thanks to a power plant burning down so we have rolling black outs across the island.
It is not unusual for power to be out a couple of days after a typhoon so having the panels is useful then as well
This is not a normal place
We looked at large arrays, 2x3x4 tracking panel systems. With the subsidies it almost made sense. But we saved 25000 by not biting. Solar makes sense in low-load, rural situations.