Path-Q Solar
Would shifting appliance use to daylight hours change the solar system size I need?
Answer
It can change the system size that best fits your goals, but it does not change the home's total annual electricity demand by itself. Moving flexible loads into solar-producing hours can increase self-consumption and may make a smaller system meet a target bill reduction, depending on production timing and export treatment.
Key points
- Identify which appliances can be scheduled without affecting comfort, safety, or equipment operation.
- Compare the home's load profile before and after shifting rather than assuming all daytime production will be used.
- Evaluate system size against annual energy, hourly alignment, and the desired level of backup or bill reduction.
What it depends on
- Appliance power and schedule flexibility
- Solar production by hour and season
- Household occupancy patterns
- Export treatment and bill structure
- Whether storage is considered
Risks and trade-offs
- Load shifting may improve value but can reduce convenience or require automated controls.
- A smaller system may reduce excess exports but may also provide less production during unexpected daytime demand.
- Changing schedules cannot eliminate evening and nighttime loads without storage or another supply source.
Information you may need
- Interval-use data or appliance schedules
- List of flexible and non-flexible loads
- Solar production estimate
- Bill structure and savings objective
Your next step
What to do next
Compare modeled system sizes using the current load profile and a realistic daylight-shifted profile.
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