First, understand the main types of solar cells. Monocrystalline panels offer high efficiency (15-22%) and sleek appearance but cost more. Polycrystalline is budget-friendly with moderate efficiency (13-16%), while thin-film is flexible but less efficient.

Next, evaluate efficiency and lifespan. Higher efficiency panels are ideal for limited space. Monocrystalline lasts 25-30 years, polycrystalline 20-25 years, and thin-film 10-15 years. Balance this with your budget constraints.

Consider your installation environment. Assess roof space, orientation (south-facing is best in Northern Hemisphere), and shading. Panels in shaded areas may need micro-inverters to maintain performance.

Don’t overlook warranties and brand reputation. Look for at least 10 years of product warranty and 25 years of performance warranty. Choose established brands with good customer reviews for long-term support.

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