Sizing

Solar panel calculator

Size the array for your energy use and sun hours.

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Layout

Panel tilt calculator

Find the best tilt angle for your latitude.

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Performance

Solar panel efficiency calculator

Panel efficiency percentage from watts and size.

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Layout

Row spacing calculator

Space rows to avoid inter-row shading.

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Losses

Shading loss calculator

How much a little shade costs you.

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Losses

Temperature derating calculator

How heat reduces real output.

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Performance

Panel degradation calculator

Long-term output decline over the years.

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Sizing

Roof area to system size

What array size fits on your roof.

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Related guides

Browse every tool on the all tools page, or design a full system with the system report builder.