Solar Glossary: 21 Essential Terms Explained
This Solar Glossary from GAF Energy and Solar provides homeowners with clear definitions of the most important terms in solar energy. Whether you’re exploring solar for your roof, evaluating quotes, or planning a switch to renewable power, understanding these 21 essential solar terms helps you make informed, confident decisions. At Thrush & Son, we’ve partnered with GAF to bring reliable solar solutions since 1960—this solar glossary, originally from GAF Energy and Solar, is updated here for clarity and practicality in 2026. Below are the 21 key terms every homeowner should know, explained in plain language so you can navigate solar discussions, compare systems, and see the real value of going solar.
Core Solar Glossary Components & Technology
- Photovoltaic (PV) — The process that converts sunlight directly into electricity using solar cells. This is the foundation of all solar power systems.
- Solar Panel / Module — A collection of solar cells that generate DC electricity from sunlight. Multiple panels form an array.
- Solar Array — A group of solar panels connected together to produce power as a single unit.
- Inverter — Converts DC electricity from solar panels into AC power your home can use. String inverters, microinverters, and hybrid inverters are common types.
- Microinverter — An inverter attached to each individual panel, optimizing output and allowing panels to perform independently (great for shaded roofs).
- String Inverter — A centralized inverter that connects to a series (string) of panels. Cost-effective but performance drops if one panel is shaded.
- Hybrid Inverter — Combines solar, battery storage, and grid power management in one unit—ideal for future-proof systems.
- Battery Storage — Stores excess solar energy for use at night or during outages. Lithium-ion batteries dominate modern setups.
Performance & Efficiency Solar Glossary Terms
- Efficiency — Percentage of sunlight converted to usable electricity. Modern panels reach 20–23% efficiency.
- Degradation Rate — Annual loss in panel output (typically 0.5% per year). High-quality panels retain 90%+ output after 25 years.
- Watt / Kilowatt (kW) — Unit of power. A 5 kW system generates about 6,000–8,000 kWh annually, depending on location and sun exposure.
- Kilowatt-Hour (kWh) — Unit of energy. Your utility bill measures usage in kWh—solar offsets this directly.
- Net Metering — Utility credits excess solar production at retail rate, rolling over to offset future bills (availability varies by state/utility).
Installation & System Types Found in this Solar Glossary
- Rooftop Solar / Roof-Mounted — Panels installed on your roof—most common and space-efficient for homeowners.
- Ground-Mounted Solar — Panels on racks in your yard—ideal for optimal tilt/angle but requires land space.
- Solar Shingles / Solar Roof Tiles — Integrated roofing material that generates power while serving as shingles—premium aesthetic option.
- Grid-Tied System — Connected to utility grid; no batteries needed, excess power sent back for credits.
- Off-Grid System — Independent setup with batteries—used in remote areas without utility access.
- Hybrid Solar System — Grid-tied with battery backup for power during outages or peak pricing.
Other Key Terms in This Solar Glossary
- Payback Period — Time to recover solar installation cost through energy savings (typically 6–10 years, depending on incentives and usage).
- Return on Investment (ROI) — Long-term financial gain from solar—often 10–20% annually after payback, plus increased home value.
- Federal Solar Tax Credit (ITC) — 30% credit on installation costs through 2032 (per current law)—a major incentive for going solar.
Why This Solar Glossary Matters for Homeowners
Understanding these 21 terms from this solar glossary empowers you to ask the right questions, compare quotes accurately, and choose a solar system that fits your roof, energy needs, and budget. GAF Energy and Solar created this foundation, and Thrush & Son builds on it with expert installation, roof integration, and long-term support. Solar isn’t just panels—it’s a smart, future-proof investment that saves money, protects the environment, and adds real home value. Ready to explore more? Check out these related guides and interesting reads: 5 Myths About Solar, Parts of a Roof, and Vinyl Siding Styles.
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