Calculation
N = ceil(Ptarget / Pmodule)
Rounding up meets target capacity; roof area, inverter and string voltage need separate checks.
N = P/Pmod
PV module count from target capacity
Rounding up meets target capacity; roof area, inverter and string voltage need separate checks.
MINTSI
02
Result
Select a target and calculate.
Understand the inputs
- Module count N — Number of whole modules rounded up.
- Target generator power Ptarget — Desired installed DC power.
- Module power Pmodule — Module nameplate power at STC.
Example
8 kW / 400 W = 20 modules.
Assumptions and limits
Identical modules, no mismatch; STC nameplate power is not annual yield.
Sources