[BETA] Fortnightly

My friend Reggie recently asked me for advice about installing photovoltaic (PV) panels on the roof of his boathouse on the river. It has no electricity now, but he wants just enough PV to power a few lights, an automatic garage door opener, and the occasional power tool. I told Reggie the same thing I tell everybody who asks me about rooftop solar: it's exciting but still expensive. Then Reggie explained why I was wrong.