What Is the 20% Rule for Solar Panels?

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2026-08-28 17:35:39 -

If you've started researching solar panels, chances are you've bumped into the phrase "20% rule for solar panels" somewhere along the way. It sounds official, almost like a regulation - but it isn't. Here's what it actually means. In short, the 20% rule is a rough planning guideline that installers and homeowners use to build a bit of extra headroom into a solar system. The idea is simple:...

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