Update from an earlier post of mine.
We just celebrated 5 years of being 100% off grid and our system is running great (4.5 KW /lead acid batteries). Overall the market place is considerably different here now compared to 5 years ago. Prices have decreased significantly, there are many more service providers and even a large distribution center here on the island now stocked with a wide variety of products.
No plans to make any changes or upgrades in the near future but I'm glad to know when the time does come to do so there will be a wide variety of options to select from.