Pre-filled for a $15,000 loan at a common 6.99% APR over 15 years — adjust any field to match your actual offer.
A shorter term or lower APR both reduce total interest — a shorter term raises the monthly payment, so compare a few combinations to find what fits your budget and expected solar savings.
At 6.99% APR over 15 years, a $15,000 solar loan costs approximately $134.74 a month, totaling $24,253 over the full term — $9,253 of that is interest on top of the principal. Compare this against your expected monthly solar savings using the solar savings calculator to check whether the loan is cash-flow positive from day one, and try different term lengths in the full solar loan APR calculator to see the total-cost trade-off.
It depends on system size and any upfront down payment — $15,000 could represent a full system cost or a partial loan after a down payment; check the solar cost calculator to see what system size this might correspond to in your area.
Generally yes on total interest — a 10-year term instead of 15 years would raise the monthly payment but reduce total interest paid; try both in the full loan APR calculator to compare exact numbers.