Path-Q Solar

How should vacancy periods affect expected solar savings for a rental property?

Answer

Vacancy generally lowers property electricity consumption, so it can reduce the bill savings available from solar during those periods. Model occupied, vacant, and partially occupied conditions separately rather than applying one average annual load without adjustment.

Key points

  • Common-area, security, heating, freeze protection, and maintenance loads may continue during vacancy.
  • Tenant-controlled loads may fall sharply or disappear when units are vacant.
  • The value of solar depends on who pays the bill and whether savings continue to benefit the owner during occupancy changes.
  • Long vacancies can make a system sized for full occupancy produce more surplus electricity.

What it depends on

  • Historical vacancy duration and expected future occupancy
  • Base building load during vacancy
  • Lease and utility-payment arrangements
  • Solar export or credit treatment and system size

Risks and trade-offs

  • Underestimating vacancy can lead to an oversized system and lower realized savings.
  • Overestimating vacancy can lead to undersizing if occupancy improves.
  • Tenant turnover may change load patterns more than the vacancy percentage alone suggests.

Information you may need

  • Monthly occupancy and vacancy history
  • Bills or interval data during occupied and vacant periods
  • Common-area and tenant-load allocation
  • Expected lease-up and turnover assumptions

Your next step

What to do next

Build an annual load forecast with explicit occupied and vacant months, then compare solar savings under conservative and expected occupancy cases.

Path-Q

Find the right next step

Answer a few questions and we’ll narrow your options.

Loading…

SQ02661