From a marketing perspective this seems absolutely genius. From an engineering perspective, it seems completely backwards. The coupling between the actual cos

From a marketing perspective this seems absolutely genius. From an engineering perspective, it seems completely backwards. The coupling between the actual cost of the system and what the user pays is minimal: drawing more power doesn't actually increase wear on the solar cells. Really, all they have done is wired a meter whose sole purpose is to waste electricity if the user isn't paying. If it works, and if it successfully brings electricity to people who would really benefit, I can't argue with it. It just seems so very wrong from an engineering perspective.