I'm building or buying a new home, should i install a solar system

When buying or building a home it is possibly the easiest time to afford solar electric systems. You could simply add the cost of the system to the construction/purchase costs and therefore pay it with your new mortgage. 

There are not many items in your home that will pay for itself after a few years, before starting to make money for you year after year. And then, when you decide to sell your home, you will reap the added desirability and resale value that solar provides. See real estate survey

There are solar panels installed in Australia in the early 1990s which are still producing electricity today, so you can expect the benefits of a quality, LG solar system to be available for decades to come.