Solar Lease vs Buy — The $17,000 Difference Nobody Tells You
May 9, 2026How Much Does Solar Really Cost? (Honest Numbers)
May 9, 2026After 1,675+ solar installations across New Jersey, I’ve seen what goes wrong. The frustrating part is that almost every costly mistake is preventable — if you know what to ask for before you sign the contract. These aren’t edge cases. I see versions of these mistakes in quotes and contracts that NJ homeowners bring me for a second opinion every single week.
For New Jersey homeowners: These mistakes carry a larger-than-average financial penalty in NJ than in most other states. NJ’s SuSI program and full retail net metering create strong returns on a well-designed system — but those returns shrink quickly when the system is undersized, poorly sited, or paired with the wrong equipment. A properly sized and installed 10kW NJ system can save $80,000–$90,000 over 25 years. The mistakes below can shrink that number by $15,000–$30,000 or more.
Mistake 1: Buying an Undersized System
This is the most financially painful mistake and the most common one. An installer quotes you a smaller system because a lower total price wins the bid. A 7kW system at $19,600 looks more affordable than a 10kW system at $28,000 — until you realize the 7kW system only covers 70% of your usage.
For the life of the system, you’re buying the other 30% from PSE&G or JCP&L at whatever the grid rate is that year. Right now that’s $0.20/kWh. In 10 years it’ll likely be $0.28–$0.32/kWh based on historical NJ rate trends. Over 25 years, that 30% grid dependency could cost you $15,000–$25,000 in grid power purchases that a properly sized system would have eliminated.
How to check: pull 12 months of kilowatt-hour usage from your utility bills. Divide your annual kWh by 1,100. That’s the approximate system size in kilowatts you need to cover your full usage in NJ’s climate. If the system you’re being quoted is more than 10% smaller than that number, ask why.
There’s also a SuSI angle. NJ utilities allow you to net meter up to 110% of your annual usage. Sizing your system to cover 100–105% of annual usage maximizes your return under NJ’s full retail credit structure. Undersizing doesn’t just cost you on the electric bill — it means you’re leaving SuSI SREC-II income on the table too, since certificates are tied to production volume.
Mistake 2: Ignoring the Inverter Choice
The inverter converts DC power from your panels into AC power your home uses. There are two main types in residential solar: string inverters and microinverters. The choice affects your system performance for 25 years.
A string inverter connects all your panels in series. If one panel underperforms — from shading, soiling, or a defect — the entire string drops to that panel’s output level. It’s like the weakest link in a chain. If a tree shadow hits one panel at 2 PM, your whole system dips for those hours. On a NJ roof with any shading (trees, dormers, chimneys), this matters every day.
Enphase microinverters work panel-by-panel. Each panel has its own inverter. One shaded or underperforming panel has no effect on the others. You get full output from every other panel regardless. Microinverters also provide panel-level monitoring — which matters a lot for mistake #7 below.
String inverters are less expensive upfront, which is why some installers push them. But on a NJ roof with any shading at all, microinverters produce more electricity over 25 years — often enough more to justify the cost difference. I install Enphase IQ8 microinverters on essentially every residential job because the production advantage and monitoring capability are worth it.
Mistake 3: Not Getting the Roof Checked First
Solar panels are designed to last 25–30 years. Your roof, depending on what’s under those panels, might need replacement in 8–12 years. If that happens, you’re paying $2,000–$5,000 to have your solar panels removed, stored, and reinstalled around the roof replacement. That cost is on top of whatever the roof replacement costs.
I am a GAF-certified roofer in addition to a solar installer. I check every roof before I design a system, and I’ll tell you honestly if you should replace it before we install. Some installers can’t or won’t do this assessment because they’re not licensed roofers. Ask yours directly: “What’s the condition of my roof and how many years do you estimate it has left? Is there anything I should address before installing solar?”
If your roof is more than 15 years old, get a roofer’s opinion before signing a solar contract. Shingle roofs typically last 20–25 years. If you’re at 15 years and your solar system will be on there for another 25, you’re likely looking at a roof replacement mid-solar-system-life. Better to know that upfront and factor it into the decision.
Mistake 4: Signing a Lease Instead of Owning
Leases and PPAs are marketed aggressively because they’re profitable for the solar company. You pay nothing upfront and get a monthly electricity rate that’s lower than your current utility rate — usually 10–15% less.
What you don’t get: system ownership, NJ SuSI SREC-II payments, or any ability to modify the system. For a 10kW NJ system, SuSI income runs roughly $1,020/year for 15 years at current rates — that’s about $15,300 going to the leasing company instead of you.
The long-term math is worse than it looks at signing. Most leases include an annual payment escalator of 1–3% — meaning your “discounted” rate grows every year. By year 15, what started as a 15% discount may be a 5% discount. And the leasing company still owns the panels generating those SREC-IIs.
The home sale problem is real. When you sell your home, a solar lease follows the house. The buyer has to either take over the lease or the lease has to be bought out. I’ve personally seen home sales in Toms River and in Hamilton fall apart because the buyer’s mortgage lender had restrictions on assuming the lease, and the buyout cost made the deal financially unfeasible for the seller. Own the system with cash or a loan.
Mistake 5: Choosing the Cheapest Quote
Solar is a 25-year investment. The cheapest quote gets there by cutting somewhere — lower-grade panels, cheaper inverters, less experienced crew, thinner warranties, or skipping administrative steps like SuSI registration.
I’ve seen $17,000 quotes for 8kW systems that use budget panels with 10-year labor warranties, string inverters, and no mention of SuSI SREC-II registration. I’ve seen $21,000 quotes for the same system size with quality panels, Enphase microinverters, a 25-year panel labor warranty, and full SuSI handling. That $4,000 upfront difference is largely recovered in better production performance and avoided future costs.
The right question isn’t “who’s cheapest?” It’s “at this price, what am I getting and what am I giving up?” Get the quote itemized — panels by model number, inverters by model number, warranty terms by specific duration. Compare component-by-component, not just total price.
Mistake 6: Not Understanding Your Net Metering Setup
Net metering is how your utility credits you for excess power your panels export to the grid. In NJ, the current policy is full retail rate net metering — every kWh you export earns you the same credit as what you’d pay to buy it. For PSE&G customers at $0.20/kWh, exporting a kWh earns you $0.20. That’s a generous arrangement and a big part of why NJ solar payback works.
What homeowners often don’t know going in: the billing cycle and true-up timing matters for how you think about system sizing. PSE&G and JCP&L roll credits monthly, with an annual true-up. If you accumulate a large credit surplus by June, most of that surplus will cover winter usage — but any excess credit at the annual anniversary is typically paid out at a lower avoided-cost rate, not the full retail rate.
The implication: sizing your system to be 200% of your usage to “sell power to the grid” doesn’t work the way some people think. The excess production earns you credits during the year, but the year-end surplus is worth significantly less. Right-size for 100–110% of annual usage. Don’t over-index on surplus production.
Mistake 7: Skipping Panel-Level Monitoring
Every solar system should come with monitoring. Specifically, panel-level monitoring — meaning you can see how much each individual panel is producing, not just the system total.
Here’s why this matters: a system with a string inverter and a single monitoring dashboard might show you 38 kWh produced today. Looks fine. But if one panel failed three months ago and is producing 0 kWh instead of 1 kWh, you’ve lost 1 kWh per day — about 90 kWh over three months, worth $18 at current rates. Multiply that over years if the problem isn’t caught, and small panel performance issues become significant losses.
Enphase microinverters include panel-level monitoring through the Enphase Enlighten app. You can see every panel’s output in real time. A panel that drops below expected production triggers an alert. You call your installer, they schedule a swap, and the problem is resolved before it costs you thousands in lost production.
If an installer is proposing a system with no monitoring, or system-level-only monitoring with no way to isolate individual panel performance — push back. The monitoring software isn’t a luxury add-on. It’s how you protect your investment for 25 years.
Mistake 8: Not Confirming SuSI Registration
SuSI SREC-II registration must be done deliberately by filing with GATS after your system is commissioned and interconnected. It’s not automatic. Some installers complete the physical installation and interconnection paperwork but never file the GATS registration. The homeowner assumes they’re earning SREC-IIs. They’re not. Every month without registration is income permanently lost.
At $85/SREC-II and 12 certificates per year, six months of missed registration costs $510 — gone forever. Before you sign a contract, get a written commitment that SuSI GATS registration is included in the scope of work and will be completed within 60 days of utility interconnection approval.
How to Avoid All of These
Take your time. Get at least two quotes and compare them line-by-line on system size, price per watt, component brands, warranty terms, and who handles permits and SuSI registration. Verify NJ contractor licenses. Ask every question on this list before you sign. And if you’re unsure about a quote you’ve received, bring it to me — I’ll review any NJ quote for free and tell you straight whether it’s reasonable or has problems.
Frequently Asked Questions
How do I know if my solar system is the right size for my NJ home?
Pull your last 12 months of electric bills and find your total annual kilowatt-hour usage. Divide that number by 1,100. The result is the approximate system size in kilowatts you need to cover 100% of your annual usage in NJ. If the quoted system size is more than 10% smaller than that, ask your installer to explain the sizing rationale.
What’s the difference between a solar lease and a solar loan?
With a loan, you own the panels, collect NJ SuSI SREC-II income, have no escalating payments, and own a system you can sell with your home. With a lease, the solar company owns the panels, keeps the SREC-IIs, and you’re locked into a 20–25 year contract with an annual payment escalator. In NJ, where SuSI income is worth $13,000–$15,000 over 15 years on a 10kW system, ownership is significantly more financially favorable.
Are Enphase microinverters worth the extra cost in NJ?
For most NJ residential roofs — which have some shading from trees, chimneys, or dormers — yes. Microinverters produce more electricity under partial shading conditions than string inverters, and they provide panel-level monitoring that lets you catch underperforming panels before they cost you money over time. The production advantage typically pays for the cost difference within 5–7 years.
What should I do if I already have solar but never registered for SuSI SREC-IIs?
Contact your installer first and ask about GATS registration status. If your system isn’t registered, contact an NJ SREC broker — they can help you understand whether registration is still possible and what documentation you’ll need. SREC-II income starts from the date of GATS registration, not the date of installation, so any unregistered period is lost income.
How do I compare solar quotes in NJ?
Ask every installer for price per watt installed (total price divided by total kilowatts), system production estimate in annual kWh, panel model and brand, inverter model and type, workmanship warranty duration, and whether SuSI GATS registration is included. Compare on all six dimensions — not just total price. The cheapest quote is rarely the best value over 25 years.
