Have you ever attempted anything on the island that is evenly remotely high tech? Or tried to keep anything from the corrosion in the air and water? Ever tried to get something as simple as a wheel bearing? I love the island and it is a wonderful place but between the punishing import duties, the skills or lack thereof the local experts, and the relentless hassle you would have with the BEL you would be completely out of your mind to try and make a truly solar powered home here. Don't forget the batteries that will corrode, the panels exposed to the air and wind, the animals that will eat the covering off the wires. It is not as simple as you think or at least it would not be for me. I have learned these lessons the hard way. The island is a wonderful place and full of a lot of interesting and fine people but better stick to a palapa roof and rice and beans for happiness.
Well sorry, but that's nothing but excuses (see Casa Pokey Jan's answer) and in December 2003 Salamander Hideaway opened it's doors 13 Miles North of San Pedro with solar and wind power and they had just 42 solar panels and a small wind generator (I think it was 3.5kw peak), something like 8 or 10 batteries and a back-up diesel generator (that during high season ran just 1 hour a day). They had 8 cabanas, a restaurant, office, ceiling fans and a responsible way of lightning and everything worked out well - no problems - batteries maintained well on a daily base, all electrical lines in tubes and power pretty much for free - it's nothing but excuses and I hear this over and over again and it's simply not true and the reason is (I repeat again): People simply do not care unless garbage show up in front of the door.
If there would be any serious and honest request on the island a company would have been founded long ago, applied and granted for 10 years duty free import, would import solar panels and wind generators and it would be at very reasonable prices. Handyman Eddy Hallyday is very good in maintaining solar and wind facilities and Eddie would even come to your place in the late evening - but not a lot of people request his services as it's more convenient to enjoy the great offers of Wine de Vine or Blue Water Grill, and get some flat screens into the country via one of the shipping companies!
....and the consequences will be more destruction like hurricane Sandy, Kathrina or Richard in Belize and then all will be crying for help again instead of looking into the mirror and look for the real reasons. We get what we create and part of it is on our beaches.
So be happy while looking at it as it's the results of what we do - all of us!