Sometimes with solar installations, there are "adders." If the customer needs a Main Panel Upgrade (MPU), that will add a cost to the final price of the installation. Here is a list of the adders:
We do not install systems smaller than 3.5 kW. The reason there is an adder for systems smaller than 5 kW is because the permits, site visit, engineering, etc. all cost the same for a small system, but since the system is smaller, not as much revenue is generated to cover those costs.