By Solar Expert
August 21, 2026
If you have two or three solar proposals on your kitchen table, you already know the sales pitch leads with the monthly payment. Learning how to compare solar quotes the right way means ignoring that payment at first and checking seven specific numbers instead — the ones that decide what a New Jersey solar system actually costs you over 25 years. This guide gives homeowners across the state a numbers-first framework for putting competing quotes side by side before signing anything.
As of August 21, 2026: the federal Section 25D residential credit is repealed for homeowner-owned systems, while New Jersey's net metering rules and the SuSI (SREC-II) performance incentive still shape quote math statewide.
At a glance — the answers most shoppers need first:
Official sources (last checked: August 17, 2026):
The monthly payment is the wrong comparison number because it blends system price, dealer fees, interest rate, and loan term into a single figure — so two identical payments can hide thousands of dollars of difference. A salesperson can hit almost any target payment by stretching the term or restructuring the loan, which is exactly why it is the number they lead with. The seven numbers below are the ones that cannot be massaged, because each is printed on the proposal or the loan disclosure itself.
Claim: Two solar quotes with identical monthly payments can differ by thousands of dollars in what you actually pay.
Evidence: A monthly payment is just principal, interest rate, and term run through an amortization formula. Stretch the term from 15 to 25 years, or pad the principal with a dealer fee, and a much more expensive system produces the same monthly number. Multiplying payment by number of months for each quote — a 60-second calculation — exposes the difference.
DC system size — panel wattage multiplied by panel count — is the baseline number that makes every other figure on a solar quote comparable. Every legitimate proposal states it, and you can verify it yourself: 22 panels at 410 watts each is a 9.02 kW DC system, full stop. Quotes may also show an AC rating, which reflects the inverter's output limit; that matters for performance, but DC size is the apples-to-apples baseline because it is what you are buying and what the price should be measured against.
The practical rule: never compare two prices until you have confirmed both system sizes. A quote that looks $4,000 cheaper is often simply a smaller array wearing a lower price tag.
Claim: A "cheaper" solar quote is often just a smaller system, not a better deal.
Evidence: System size equals panel wattage times panel count, and both appear on every legitimate proposal. If Quote A is 7.2 kW and Quote B is 8.8 kW, their total prices are not comparable until you normalize by size (price per watt) — a step anyone can verify with the numbers printed on the quotes themselves.
Every complete quote states an estimated first-year production figure in kilowatt-hours, generated by modeling software that accounts for your roof's tilt, compass orientation, shading, and local weather data — and the assumptions behind that number matter as much as the number itself. There is no single "correct" kWh figure to look for; the useful move is to compare production per kilowatt across your own quotes for the same roof.
Divide each quote's year-one kWh estimate by its DC system size. The results should land close together, because it is the same roof under the same sky. If one installer projects noticeably more production per kilowatt than the others, ask to see the assumption page from their production model — the shading and orientation inputs are where optimistic estimates hide.
Claim: If one quote projects noticeably more production per kilowatt than the others for the same roof, the model assumptions — not the equipment — are usually the reason.
Evidence: Installers model production with software that takes tilt, azimuth, weather data, and a shading measurement as inputs. Same roof, same inputs, similar output: large gaps almost always trace to optimistic shading or orientation assumptions, which the installer can show you on the model's assumption sheet if asked.
Close to 100% of your trailing 12-month usage is the sweet spot for most New Jersey homes — offset equals the quote's estimated year-one production divided by the kilowatt-hours you actually used over the last 12 months. Under New Jersey net metering, monthly surplus production rolls forward as a credit on your bill, but production still left over at the annual true-up is compensated at a lower, wholesale-type rate rather than the full retail rate — a rule described by New Jersey's Clean Energy Program and overseen by the NJBPU. That annualized true-up applies whether you are in PSE&G, JCP&L, or Atlantic City Electric territory.
Also check the denominator. An offset percentage computed against an installer's estimate of your usage — rather than your actual 12-month bill history — is a red flag, because shrinking the assumed usage inflates the offset. Hand every installer the same 12 months of bills and make them all compute offset the same way.
Claim: An offset percentage well above 100% usually makes a quote look better than it will perform financially.
Evidence: Under New Jersey net metering, monthly surplus rolls forward as a credit, but production left over at the annual true-up is paid out at a lower wholesale-type rate rather than the full retail rate. That means kilowatt-hours beyond your annual usage earn less, so the extra system size behind a 130% offset costs full price but returns reduced value — a program rule described by New Jersey's Clean Energy Program.
To compare prices fairly, divide each quote's total contract price by its DC system size in watts — that is the price per watt, and it is the first calculation to run on every proposal before you look at anything else. Insist on getting the total cash price in writing even if you plan to finance; it is the anchor you will need to spot dealer fees in Number 5. For context on what New Jersey systems typically cost, see our guide to solar panel cost in 2026.
The table below is an illustrative example only — the numbers are invented to show the mechanics, not to represent New Jersey market pricing. Notice how two quotes with the same monthly payment tell completely different stories once the seven numbers are lined up.
| Line item | Quote A | Quote B |
|---|---|---|
| Monthly payment | $249 | $249 |
| System size (DC kW) | 8.0 kW | 7.2 kW |
| Year-one production estimate | 9,400 kWh | 8,300 kWh |
| Bill offset | ~98% | ~86% |
| Total cash price | $28,000 | $27,400 |
| Price per watt | $3.50 | $3.81 |
| Amount financed (after dealer fee) | $28,000 | $33,600 |
| Loan term | 12 years | 25 years |
| Total payments over term | ~$35,900 | ~$74,700 |
Claim: Price per watt is the only price figure that lets you fairly compare two different-size solar systems.
Evidence: Total price divided by DC watts strips system size out of the comparison: a $28,000 quote for 8 kW ($3.50/W) is a better price than a $25,000 quote for 6.5 kW ($3.85/W) even though the second number looks cheaper. It is pure arithmetic using two figures printed on every proposal, so no installer can argue with the method.
The number to find is the amount financed on the loan document — with dealer fees rolled in, it can run well above the cash price of the identical system. The mechanism is simple: lenders charge installers a fee in exchange for offering below-market interest rates, and installers commonly build that fee into the financed contract price. The advertised APR is real, but it is being applied to an inflated principal, which is why a rock-bottom rate can still be an expensive loan.
The one-question script that exposes it: "What would this exact system cost if I paid cash today?" Compare that answer to the amount financed on the loan disclosure — the gap is the dealer fee. Federal consumer-protection guidance on home solar from the FTC encourages homeowners to make exactly this kind of financing comparison before signing.
Claim: The financed principal — not the advertised APR — tells you what a low-rate solar loan really costs.
Evidence: Solar lenders charge installers a fee in exchange for offering below-market interest rates, and that fee is typically rolled into the contract price you finance. The result: the APR on the paperwork is accurate, but it is charged on a principal larger than the cash price of the system. Comparing the amount financed against the installer's own cash quote for the identical system exposes the fee — a comparison federal consumer-protection guidance on solar financing encourages homeowners to make.
To find the real cost of a financed system, multiply the monthly payment by the number of months in the term, then add any payments the schedule steps up later — that total is what the system actually costs you. Compare it against the cash price from Number 4: the difference is the price of the financing itself, and it is the single most revealing comparison you can run across competing quotes.
One 2026-specific check matters here. Some solar loans are still structured around an assumed lump-sum paydown in the first 12 to 18 months — a structure historically built for the federal Section 25D residential credit, which the One Big Beautiful Bill Act repealed in 2025 for homeowner-owned systems. If a quote's advertised payment assumes a paydown you have no federal refund to fund, the payment re-amortizes upward when the paydown is not made. If a lease or PPA is among your quotes, note that the commercial investment tax credit still exists for third-party-owned systems, which is one reason their pricing can look different. For the bigger picture on ownership economics, see whether NJ solar is worth it without federal tax credits.
Claim: If a solar loan quote assumes a big voluntary paydown in year one or two, the advertised monthly payment may not be the payment you actually end up with.
Evidence: Many solar loans are written with two payment schedules: a lower payment that assumes the borrower makes a lump-sum prepayment early in the term, and a higher re-amortized payment if they don't. Those structures were historically built around the federal Section 25D residential credit, which the One Big Beautiful Bill Act repealed in 2025 for homeowner-owned systems — so there is no federal refund to fund that paydown. The two schedules are disclosed in the loan paperwork, which is where a careful reader verifies this before signing.
A complete solar quote states four separate warranties in writing — equipment, workmanship, roof-penetration, and production — each with its own term length and its own backer. If any of the four is missing from a proposal, ask why before you sign. Our list of questions to ask prospective solar installers pairs well with this section.
The equipment warranty is backed by the panel and inverter manufacturers, so it survives even if your installer goes out of business. The question to ask: who pays the labor to remove and replace a failed component? Manufacturers often cover the part but not the truck roll.
The workmanship warranty covers installation defects and is backed by the installer itself — which means it is only as durable as the company standing behind it. Compare the stated term, but weigh it against each installer's years in business and New Jersey track record.
The roof-penetration warranty covers leaks at the mounting points where racking penetrates your roof. Confirm whether it is a separately stated term or folded into workmanship, and ask how it interacts with your existing roof warranty — an answer worth getting in writing.
A production warranty guarantees a stated kWh output — but it is only meaningful if it names the remedy (a payment or a repair) and the measurement method. A guaranteed number with no stated remedy is a marketing line, not a warranty.
Claim: A long warranty from an installer who won't be around is worth less than a shorter warranty from one who will.
Evidence: Equipment warranties are honored by manufacturers regardless of what happens to the installer, but workmanship, roof-penetration, and production warranties are promises of the installing company itself — if it closes, those obligations usually die with it. That is why the years-in-business and NJ track record behind the warranty page matter as much as the term lengths printed on it, and why labor coverage for warranty swaps should be asked about explicitly.
Because the payment is just principal, interest rate, and term run through an amortization formula. A longer term or a dealer-fee-inflated principal lets an expensive system match a cheap one's payment. Multiply each quote's payment by its number of months to see the real gap.
A dealer fee is what the lender charges the installer for offering a below-market APR, and it is typically rolled into the financed contract price rather than listed as a line item. Find it by comparing the amount financed on the loan document to the installer's cash price for the identical system — the gap is the fee. FTC consumer guidance on home solar encourages exactly this comparison.
No — ultra-low APRs are usually funded by larger dealer fees added to the principal, so a higher-APR loan with no fee can cost less over the term. Compare total payments over the full term, not rates.
Divide the total contract price by the system size in DC watts (kilowatts times 1,000). For example, a $28,000 quote for an 8 kW (8,000-watt) system works out to $3.50 per watt. Run the calculation for every quote before comparing anything else.
It can, but it rarely helps. Under New Jersey net metering, production left over at the annual true-up is credited at a lower wholesale-type rate — a rule described by New Jersey's Clean Energy Program — so capacity beyond roughly 100% of your annual usage costs full price and returns less per kilowatt-hour.
It covers leaks at the mounting points where racking penetrates your roof. There is no single standard term, so ask each installer to state theirs in writing and compare the answers side by side. Also ask how it interacts with your existing roof warranty, and whether it is separate from the workmanship warranty or folded into it.
The fastest way to settle a quote comparison is to make every installer show all seven numbers in the same format: size, production, offset, cash price and price per watt, amount financed, term total, and the four warranties. Bring your competing proposals and 12 months of utility bills, and PowerLutions — one of New Jersey's top solar installers — will walk through all seven numbers line by line and put its own quote in the exact same format, so the comparison is apples to apples.
Claim: An installer willing to show all 7 numbers in writing has nothing to hide — and that willingness is itself a comparison signal.
Evidence: Every number in this framework already exists in a legitimate proposal or its loan disclosures; producing them costs a transparent installer nothing. Hesitation to state the cash price, the amount financed, or the production model's assumptions is informative precisely because the request is so easy to fulfill.
Ready for a quote you can actually compare? Email us for a quote or call 732-987-3939 — and have your current proposals handy.
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