Path-Q Solar
How should I size solar if my electricity use is much higher in winter?
Answer
Base sizing on the full annual and seasonal load, but recognize that winter demand may not be matched by winter solar production. A larger array can increase annual generation, while its ability to offset winter bills depends on sunlight, roof conditions, storage, and export or billing rules.
Key points
- Identify whether winter use comes from heating, shorter days, lighting, water heating, or another recurring load.
- Use monthly production estimates rather than an annual average alone.
- Consider efficiency improvements or a heat-pump conversion before compensating for high winter demand with more panels.
- Separate energy offset from backup-power requirements; they are different design goals.
What it depends on
- Cause and magnitude of winter demand
- Seasonal solar resource, roof orientation, and shading
- Electricity rates and export treatment
- Potential efficiency or heating changes
Risks and trade-offs
- Sizing to eliminate winter purchases may create substantial summer excess.
- Winter weather can reduce production and increase uncertainty.
- A battery generally shifts energy across hours, not across an entire season.
Information you may need
- Monthly consumption for at least one full year
- Winter heating and appliance loads
- Roof and shading information
- Current and expected future heating equipment
Your next step
What to do next
Ask for a month-by-month production and consumption model, with separate scenarios for efficiency upgrades, larger solar capacity, and any storage.
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