Path-Q Solar

How can I compare solar ROI with investing the same money in another home improvement?

Answer

Compare both projects using the same time horizon, initial cash commitment, financing treatment, and after-tax cash-flow method. Include solar bill savings and costs, while including the other improvement's energy savings, maintenance, usable benefit, and any uncertain resale value.

Key points

  • Use discounted cash flow, such as net present value, rather than comparing headline payback alone.
  • Compare risk, liquidity, comfort, resilience, and maintenance benefits separately from financial return.
  • Do not count speculative resale value as certain cash recovery.
  • If the projects compete for the same funds, compare their incremental cash flows.

What it depends on

  • Cost and financing of each project
  • Expected savings or other benefits
  • Useful life and replacement needs
  • Discount rate and treatment of taxes or resale value

Risks and trade-offs

  • A project with lower financial return may provide greater comfort or necessity.
  • Savings estimates for both projects may be uncertain and correlated with usage.
  • Different project lives can make simple ROI comparisons misleading.

Information you may need

  • Complete cost and financing data for both options
  • Expected annual benefits and operating costs
  • Expected holding period
  • Preferred risk and discount-rate assumptions

Your next step

What to do next

Build a side-by-side cash-flow comparison using base, conservative, and optimistic cases for each improvement.

Path-Q

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