Path-Q Solar
How should seasonal electricity use affect my solar system design?
Answer
Design should compare seasonal electricity demand with seasonal solar production, not just match annual totals. If use is concentrated in winter, the system may produce less when demand is highest, so roof orientation, system size, storage, efficiency improvements, and the value of grid imports or exports all matter.
Key points
- Heating, cooling, and other seasonal loads can change both system size and financial value.
- Winter production is affected by shorter days, weather, sun angle, and shading changes.
- Annual offset targets can hide substantial seasonal imports or exports.
- Efficiency measures or load management may reduce the system size needed.
What it depends on
- Monthly electricity use
- Monthly production estimate
- Seasonal shading and weather
- Target annual or seasonal offset
- Storage and electricity-credit arrangements
Risks and trade-offs
- Sizing for the highest seasonal demand may create excess production at other times.
- A battery may shift energy over short periods but cannot generally replace all seasonal production differences.
- Forecasting future heating or cooling use is uncertain.
Information you may need
- Month-by-month electricity use
- Seasonal production model
- Planned heating, cooling, or efficiency changes
- Current import and export terms
- Preferred annual and seasonal coverage goals
Your next step
What to do next
Request a month-by-month design showing production, consumption, imports, exports, and any storage assumptions.
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