How big a solar system can I install in Florida?

The three limits that actually bind

1. 1

   Your consumption

   The 115% rule ties system size to what you actually use. A home with modest consumption cannot net-meter a very large array regardless of roof space.

2. 2

   Your roof

   Usable area after setbacks, obstructions and shading, and how much of it faces a productive direction. Fire-code setbacks around ridges and edges remove more area than most homeowners expect.

3. 3

   Your electrical service

   The rule also constrains generating capacity against your service capacity, and your panel’s busbar rating limits how much generation can be back-fed without an upgrade.

Why the 10 kW boundary is worth planning around

Tier 1 covers systems of 10 kW or less and is the simplest interconnection route. Above 10 kW you move into Tier 2, which brings additional insurance and study requirements. A design at 10.4 kW may carry more process cost than the extra production is worth, so it is worth asking your installer to price both sides of the boundary.

If you are planning to electrify

The 115% test looks at expected consumption, so a household about to add an electric vehicle, a heat pump or a pool heater has a legitimate case for a larger system than last year’s bills suggest. Raise this early: it is far easier to justify the sizing during the application than to expand afterwards.