Path-Q Solar

How should a shorter expected ownership period affect a solar payback calculation?

Answer

Compare the expected ownership period with the payback period and count only the cash flows likely to occur before sale. If ownership may end before payback, treat the remaining value as uncertain rather than assuming the seller recovers the full investment.

Key points

  • Calculate cumulative cash flow through the expected sale date.
  • Separate realized bill savings from uncertain resale value or buyer compensation.
  • Include loan payoff, transfer, removal, or sale-related costs where applicable.
  • Use several ownership-duration scenarios if the move date is uncertain.

What it depends on

  • Expected time before sale
  • Financing balance and payoff terms
  • Transferability of any agreement
  • Recoverable value of the equipment and remaining contract

Risks and trade-offs

  • A project can have attractive lifetime economics but poor economics for a short owner.
  • Future buyer willingness to pay for solar is uncertain.
  • Selling before payback can create a cash shortfall if debt exceeds recoverable value.

Information you may need

  • Likely ownership period
  • Initial net project cost and financing terms
  • Expected annual savings
  • Potential sale, transfer, or payoff costs

Your next step

What to do next

Run cash-flow scenarios for the likely sale date, an earlier sale, and a longer hold period without assuming a specific resale premium.

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