Types of Solar Panels: Monocrystalline vs Polycrystalline vs Thin-Film

When you get a solar quote, the panel type matters for efficiency, appearance and price. There are three main kinds. Here’s what actually differs.

Monocrystalline (most common for homes)

Made from single-crystal silicon.

• Highest efficiency (typically ~19–22%), so you need fewer panels for the same output — great for limited roof space.
• Sleek all-black look many homeowners prefer.
• Slightly more expensive per panel, but usually the best choice for residential roofs today.

Polycrystalline

Made from multiple silicon fragments melted together.

• Lower efficiency (~15–17%), so you need more panels for the same output.
• Cheaper per panel, with a bluish, speckled appearance.
• Less common on new residential installs now that mono prices have fallen.

Thin-film

A different technology, deposited in thin layers.

• Lowest efficiency for the space, so it needs the most area.
• Lightweight and flexible; better suited to large commercial roofs or special applications than typical homes.

Which should you choose?

For most homes, monocrystalline is the default: highest efficiency means fewer panels and better use of roof space, which is exactly what the panel size calculator rewards. Polycrystalline can make sense on a tight budget with plenty of roof area.

Don’t forget the inverter

Panels are only half the system. The inverter (string vs microinverters) affects performance with shading and how the system is monitored — and it’s often the first part to need replacing (see how long panels last).

Bottom line

Most homeowners end up with efficient monocrystalline panels. What matters more for your wallet is the total installed price per watt and your utility’s rates — compare quotes on those, not just the panel brand. Start with the Solar Savings Calculator.

Educational information only. Efficiency ranges are typical, not guarantees.