How to spot door-to-door 'free solar' sales pitches, compare equipment tiers, and evaluate installer warranties.
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Check ZIP code availabilityWhat a complete solar proposal must include
A transparent solar estimate is an itemized engineering plan, not just a monthly payment number on a tablet. Before evaluating pricing, ensure each contractor provides full technical specifications in writing.
Total DC system capacity (kW DC) and expected Year 1 AC energy output (kWh)
Exact equipment manufacturer, model numbers, and wattage ratings for panels and inverters
Rooftop layout design showing panel placement, azimuth (direction), and pitch angles
Shading analysis accounting for trees, chimneys, and neighboring structures
Itemized scope for permitting, utility interconnection filing, and any required electrical panel work
Clear unfinanced cash price alongside any optional financing schedules
Comparing panel and inverter equipment tiers
Solar equipment quality dictates long-term power production and durability in extreme temperatures.
The four separate warranties protecting your system
A solar installation relies on four distinct warranty layers rather than a single guarantee.
1. Manufacturer Equipment Warranty (12 to 25 years): Covers defects in the panels themselves.
2. Manufacturer Performance Warranty (25 years): Guarantees linear power production (typically maximum 0.5% degradation per year).
3. Inverter Warranty (10 to 25 years): Covers the power conversion hardware.
4. Installer Workmanship and Penetration Warranty (5 to 25 years): Protects against installation errors and guarantees roof penetration points against leaks. This is the most crucial warranty for protecting your home.
High-pressure solar sales red flags to avoid
Solar is a major home infrastructure investment. Beware of aggressive sales outfits using deceptive marketing tactics.
Installer verification and vetting checklist
Ask these questions before signing any installation contract.
Is your company licensed as a dedicated solar or electrical contractor in this state and municipality?
Do you have NABCEP (North American Board of Certified Energy Practitioners) certified professionals on staff overseeing design and installation?
Are installations completed by in-house W-2 crews, or subcontracted to third-party installation teams?
How many solar systems have you successfully permitted and interconnected with our specific local electric utility in the past 12 months?
Will you provide a current certificate of insurance showing general liability and workers' compensation coverage?
Frequently asked questions
What is NABCEP certification and why does it matter?
NABCEP is the premier national certification standard for solar energy professionals. Installers with NABCEP PV Installation Professional credentials have demonstrated rigorous technical expertise, hands-on field experience, and adherence to National Electrical Code standards.
How long does a residential solar installation take?
While physical panel mounting on the roof usually takes 1 to 2 days, the full process (site survey, engineering, city permitting, utility interconnection approval, and final inspection) typically takes 4 to 10 weeks.
What happens to solar panels if the installer goes out of business?
Equipment and performance warranties are backed directly by the panel and inverter manufacturers, not the installer. However, your workmanship and roof leak warranty depends on the installer, which is why choosing established local businesses with strong financial track records is vital.
Cost ranges here are general research estimates compiled from national and regional data. They are not quotes, offers or price guarantees — only a licensed provider who has seen the job can price it. GetLocalExperts is a free matching service and does not perform home services.
This guide was researched and reviewed by the GetLocalExperts Editorial Team against primary regulatory benchmarks, state contractor licensing board standards, and FTC consumer protection guidelines.
