Path-Q Solar
How should irregular electricity use from a seasonal property affect solar sizing?
Answer
Size the system from the property's annual and seasonal load profile, not from the highest occupied month alone. Determine whether the goal is annual energy offset, lower bills during occupancy, or reliable power when unoccupied, because each can produce a different design.
Key points
- Map occupancy, heating, cooling, water systems, security, and standby loads by month.
- Seasonal production may not align with seasonal occupancy or consumption.
- Unoccupied properties may still have meaningful refrigeration, freeze protection, pumps, or monitoring loads.
- Backup requirements can be more important than annual energy offset.
What it depends on
- Occupancy dates and duration
- Monthly load distribution
- Unoccupied standby and protection loads
- Solar production by season
- Export, storage, and outage objectives
Risks and trade-offs
- Sizing for peak occupancy can create excess production when the property is empty.
- A small system may not meet high seasonal loads or outage needs.
- Remote sites can have higher maintenance, monitoring, and access challenges.
Information you may need
- At least 12 months of bills or meter data
- Occupancy calendar
- Equipment that runs while unoccupied
- Outage and remote-monitoring requirements
- Site and roof constraints
Your next step
What to do next
Build a month-by-month load and occupancy profile and ask for separate designs for bill reduction and backup reliability.
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SQ00930