Path-Q Solar

How does a solar loan's interest rate change the total cost of the system?

Answer

A higher interest rate increases the total amount repaid and usually increases the share of each payment attributable to interest, even when the financed principal is unchanged. The effect depends on the principal, term, payment structure, fees, and whether the quoted rate is tied to a higher upfront price or other financing charge.

Key points

  • Compare APR, total repayment, financed amount, origination or dealer fees, and prepayment terms together.
  • A longer term can increase total interest even if the rate is unchanged.
  • Some low-payment offers may use a higher project price or embedded financing cost.
  • Use an amortization schedule to see principal and interest over time.

What it depends on

  • Loan principal and financed project price
  • Interest rate or APR
  • Term, payment schedule, and fees
  • Prepayment and refinancing assumptions

Risks and trade-offs

  • Comparing nominal rates without fees can produce the wrong ranking.
  • A lower monthly payment can result in much higher total repayment.
  • Future refinancing is uncertain and should not be required for the project to work.

Information you may need

  • Truth-in-lending or equivalent loan disclosure
  • APR, fees, term, and payment schedule
  • Cash price versus financed price
  • Total repayment and payoff schedule

Your next step

What to do next

Request a standardized loan comparison showing financed amount, APR, fees, monthly payments, and total repayment for each option.

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