Path-Q Solar
Should planned changes to when I use major appliances be reflected when sizing my solar system?
Answer
Yes. Planned, credible changes in appliance timing should be included in the design analysis, especially when they move consumption into daylight hours. They may improve direct solar use and affect battery or export assumptions, but they should not be treated as guaranteed savings unless the schedule is practical and sustainable.
Key points
- Load shifting changes when solar is used, while the appliance's total annual energy use may remain similar.
- Daytime loads can increase self-consumption and reduce reliance on exports.
- Future appliances or changed usage levels can also change the total solar capacity needed.
- The design should show both expected operation and a conservative case if schedules are uncertain.
What it depends on
- Which appliances will change and by how much
- Whether the changed schedule can be automated or consistently followed
- Seasonal solar availability
- Battery plans and export treatment
Risks and trade-offs
- Overestimating future load shifting can make projected savings unreliable.
- A larger system may have limited value if the shifted load is small or occasional.
- Appliance operation during daylight may conflict with convenience, noise, or occupancy.
Information you may need
- Current appliance energy use and schedules
- Planned schedule changes and their expected frequency
- Future appliance purchases or fuel-switching plans
- Interval consumption data or representative load estimates
Your next step
What to do next
Prepare a current-load case and a planned-use case for the solar designer, identifying which changes are definite and which are only possible.
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