Path-Q Solar

How should I compare solar loan interest with the savings on my electricity bill?

Answer

Compare the loan's complete payment schedule and total borrowing cost with the system's time-based bill savings, operating costs, and residual value. Do not compare the nominal interest rate with annual savings in isolation.

Key points

  • Include APR, origination fees, dealer fees, prepayment terms, variable-rate risk, and any deferred-payment period.
  • Model monthly loan payments against expected monthly bill changes, including seasonal variation.
  • Use conservative assumptions for production, electricity prices, exports, degradation, and maintenance.
  • Compare the financed option with a cash purchase and with no installation using the same time horizon.

What it depends on

  • Complete loan terms and payment schedule
  • Net installed price and verified incentives
  • Monthly production and bill-savings forecast
  • Future operating, replacement, and insurance costs

Risks and trade-offs

  • A low advertised rate can conceal large fees or a higher total cost.
  • Loan payments may exceed early bill savings, creating cash-flow pressure.
  • Variable electricity prices and production uncertainty can make savings less predictable than loan payments.

Information you may need

  • Loan agreement or formal disclosure
  • Cash price and all dealer or origination charges
  • Monthly savings forecast
  • Prepayment, transfer, and default terms

Your next step

What to do next

Create a month-by-month comparison of loan payments, projected bill savings, fees, and remaining balance under conservative and optimistic scenarios.

Path-Q

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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.

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