It's a private company and they invested US$2 million on this, so maybe the panels will last. Also the high cost of the EDE's electricity is an extra incentive to take care of the panels.
Most Banco Popular stand alone branches have roofs full of working solar panels and that has been the case for quite a few years now. If they can do it, I don't see why Carrefour can't.
Solar panels installed by the government are another story and if you want a good example, look what happened to the solar powered light fixtures on the Mauricio B?ez bridge near San Pedro de Macor?s. Yes, the issue there wasn't a lack of maintenance per se, but...