Path-Q Solar

How should I size solar for a currently vacant rental property when future tenants may use much more electricity?

Answer

Use a documented estimate of future tenant demand rather than the vacant property's current consumption, but avoid sizing solely on an uncertain maximum. Model expected occupancy, appliances, heating, cooling, hot water, EV charging, and how much usage the solar arrangement can actually offset.

Key points

  • Vacancy produces little or no useful load history.
  • Future demand should be based on the property's equipment and likely occupancy, not only the landlord's assumptions.
  • A phased or expandable design may be preferable when tenant usage is uncertain.

What it depends on

  • Expected occupancy and tenant profile
  • Heating, cooling, hot-water, and appliance systems
  • Whether utilities are paid by the landlord or tenant
  • Metering and solar-benefit allocation
  • Expansion capacity and tariff rules

Risks and trade-offs

  • Oversizing may create excess exports or poor economics if tenants use less than expected.
  • Undersizing may leave future energy demand unserved or require later changes.
  • Tenant behavior and lease terms can change load substantially.

Information you may need

  • Property size and expected occupancy
  • Appliance and HVAC specifications
  • Planned EV or other electrification loads
  • Utility-meter and lease arrangements
  • Previous bills from comparable occupancy, if available

Your next step

What to do next

Prepare low, expected, and high occupancy-load scenarios and ask for a design that states the assumptions and possible future expansion path.

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