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Solar systems

Sizing, loads, batteries, inverters, and design.

Beginner · 14 min · Updated 2026-10-10

How to Size a Rooftop Solar System From Your Electricity Bill

Turn your monthly bill into a system size in five steps: bill to daily load, worst-month sun hours, array math, roof check, and battery option — with worked examples at 2, 5, and 10 kW.