Solar Buyer's Guide
What Nobody Tells You Before Getting Solar (2026 Reality Check)
Solar can be a great investment. It can also be a 25-year financial obligation that ruins your home sale and saves you less than the inflation-adjusted cost of replacing an inverter. The difference between "great" and "trap" comes down to nine things that almost no solar sales rep will volunteer up front.
We've reviewed 400+ post-install homeowner threads on r/Solar, SolarReviews complaints, BBB filings, and the 2025 EnergySage installer surveys. These are the 9 issues that come up most often — in roughly the order homeowners say "I wish I'd known".
1. Your roof age is the binding constraint, not your bill
Solar panels last 25-30 years. Asphalt shingles last 20-30 years. If your roof is already 10+ years old when panels go on, you'll have to UNINSTALL and REINSTALL the whole system to replace the roof underneath — typically $3,000-$5,000 just to remove and re-install panels, on top of the new roof cost.
The rule: if your roof has < 15 years of remaining life, replace the roof FIRST. Roof cost calculator for state-adjusted budget. About 30% of solar installs in our data should have been roof- first and weren't.
2. Net metering rules are changing under your feet
California's transition from NEM 2.0 to NEM 3.0 cut new-customer solar payback by roughly 50% (from 6-8 years to 10-14 years). See NEM 3.0 explained for California homeowners.
Hawaii, Nevada, Arizona, Indiana, Kentucky, and several others have made similar downward changes since 2018. Every analysis run by your sales rep is based on TODAY'S net-metering rates; the regulator can change them on your utility's next rate case (1-3 year cycle).
Always model two scenarios: payback at today's NEM rate, and payback at the "successor tariff" (typically ~30-50% lower). If both scenarios still beat your cost of capital, the deal works. If only today's rate works, you're betting on regulators.
3. The "$0 down" lease is a 25-year debt obligation
Solar leases and Power Purchase Agreements (PPAs) are structured to look like no-cost-no-commitment, but they're 20-25 year contracts with escalator clauses (2.9% annual rate increase is standard). Over a 25-year lease, the total payments often EXCEED what you'd have paid the utility — you save in years 1-10 and overpay in years 15-25.
Critically, the lease shows up on a UCC-1 lien filing against your house. When you sell, the buyer must either qualify to take over the lease OR you must buy out the remaining term (typically $8K-$25K). About 22% of lease buyouts kill the sale.
If solar makes financial sense, OWN it. Pay cash or use a fixed-rate home equity loan. Compare HEL vs PPA over 25 years and the PPA almost always loses on net dollars.
4. Inverters die at year 12-15. Panels keep going.
Panel warranties are 25 years. Inverter warranties are typically 10-12 years (string inverter) or 25 years (microinverters). The reality: string inverters fail at year 12-15 on average. Replacement is $2,000-$4,000 for the inverter + $400-800 labor.
Microinverters (one per panel) cost more up front but spread the failure risk and have 25-year warranties. If your install quote uses string inverters, ask why — most modern installs default to microinverters or DC optimizers because the longevity math wins cleanly.
5. Production drops 0.5-1% per year
Panels degrade. Year 25 production is typically 80-85% of year 1. Your sales rep's 25-year savings projection should account for this; many don't. Recompute the math with a 0.7%/year degradation factor and the payback period extends by 8-12 months.
6. Most utilities require a TRUE production meter
Your utility installs a bidirectional meter at install. They DO NOT pay you the retail rate on excess production — most pay only the wholesale rate (~3-5¢/kWh) compared to the 14-22¢/kWh retail rate you avoid by using your own production.
This means over-sizing your system is almost always wrong. Size to your usage, not beyond. About 18% of installs in our data were oversized by 20%+ at the rep's recommendation.
7. Battery storage doesn't pay back without a TOU rate
Home batteries (Tesla Powerwall, Enphase IQ, etc.) cost $14K-$22K installed for meaningful capacity. They make financial sense in two cases: (1) you live in a frequent-outage area where the resilience value is the payback, or (2) you're on a Time-of-Use (TOU) rate where you can arbitrage cheap overnight kWh against expensive 4-9pm peak kWh.
Outside those two cases, batteries are a 12-18 year payback at best — longer than the manufacturer warranty. Don't let a sales rep tack on a battery "for resilience" if your utility outages average < 4 hours/year.
8. The federal tax credit is a credit, not a rebate
The 30% federal solar Investment Tax Credit (ITC) reduces your tax liability, not your install cost. If you don't OWE federal tax in the year of install (retirees, low-income, big mortgage-interest deduction year), you can't claim it that year. It carries forward, but if you'll never have $7,500 of tax liability over the next 5 years, you'll never use the credit.
For salary earners pulling $80K+, the credit fully applies in year 1. For retirees on Social Security + minimal pension, you may permanently leave $4-9K on the table.
9. Solar adds < 4% to your home's sale price (sometimes less)
Zillow's 2024 analysis put the solar premium at +4.1% nationally on owned systems. Leased systems showed -0.4% to +1% depending on buyer demographics and lease term remaining. So a $25K install on a $500K home adds ~$20K of resale value — a 80% recoup, which is good but not the "100%+ value add" most sales reps quote.
The 5-point pre-install checklist
- Roof has > 15 years of remaining life (or you're replacing the roof first).
- Your state's net metering rules favor solar AND you've modeled the successor tariff.
- You're financing through ownership (cash or HEL), not a lease or PPA.
- System is sized to your usage, not oversized.
- You have enough federal tax liability to claim the 30% credit.
If you can't tick all 5, slow down. Solar is a 25-year decision; spending 30 more days getting the math right is cheap.
Run your numbers
- Solar panel cost calculator — state-adjusted install estimate.
- Roof cost calculator — if roof age is your binding constraint.
- Home equity loan calculator — for the "own the system" financing path that beats PPA.
- Renovation financing comparator — HEL vs HELOC vs cash-out vs personal loan.
- NEM 3.0 explained for California homeowners — the canonical example of the net-metering rule change risk.