How much less efficient are north-facing solar modules?

By Paul Grana By Paul Grana, co-founder, Folsom Labs
It’s considered common knowledge that you want to point your solar modules south, toward the equator (assuming you are in the northern hemisphere). This maximizes the energy production over the course of the year, through both summer and winter.
Sometimes, however, the homeowner will want to add modules on the north-facing roof. This may be for aesthetic purposes, or sometimes because the south-facing rooftop isn’t fit for solar. The most common rule-of-thumb is that you simply can’t do that. But we wanted to ask, how bad is it to put solar panels on a north-facing roof?

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