Practical guides on rooftop solar design: how many panels fit, the best tilt and direction, reading proposals and estimating generation and savings.
A plain-language guide to the numbers in a rooftop solar proposal, so you can check the system size, generation estimate, savings and payback before you sign.
Read the guideWhich way should solar panels face, and at what angle? See how direction and tilt change yearly output, and why east-west roofs and flat roofs still work well.
Work out how many solar panels your roof can hold from its size, shape and obstacles, with a worked example and the rules of thumb installers use.
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