Path-Q Solar

How should a small business calculate the payback effect of downtime required to install solar equipment?

Answer

Add the economic cost of installation downtime to the project's upfront cost and recalculate payback. Use the operating contribution actually lost during planned and likely unplanned interruptions, plus temporary labor, spoiled materials, restart costs, overtime, and other mitigation expenses; do not use gross sales alone unless that is the relevant avoidable loss.

Key points

  • Estimate downtime by phase, including shutdown, access restrictions, testing, commissioning, and restart.
  • Calculate lost contribution margin or avoidable profit, not just revenue.
  • Include temporary power, rescheduling, overtime, inventory loss, customer penalties, and internal coordination costs.
  • Model planned and downside durations separately and compare mitigation options.

What it depends on

  • Installation schedule and required shutdowns
  • Production margin and operating costs
  • Ability to shift work, use temporary power, or operate partially
  • Contractual delay protections and business interruption coverage

Risks and trade-offs

  • A short installation may have a higher daily disruption cost than a longer phased approach.
  • Unplanned commissioning delays can materially extend payback.
  • Avoiding downtime may require temporary equipment or premium scheduling.

Information you may need

  • Installer schedule and outage assumptions
  • Hourly or daily production economics
  • Mitigation costs and feasible alternate production plans
  • Customer, supplier, and insurance obligations
  • Contract terms for delay and restoration

Your next step

What to do next

Ask each installer for a phase-by-phase outage schedule and build a downtime-cost range into the payback model before comparing proposals.

Path-Q

Find the right next step

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

Loading…

SQ02985