The most popular systems are solar water heaters, like the one Dave Kollar had installed in his Madison County home two years ago. The water heater is powered by two small solar panels on his roof that charge batteries. … For homeowners wanting to do more than heat water, there is one key thing to understand: Success is not so much about how much power your solar system can produce; it is about how energy-efficient you can make your home so it uses as little power of … [...]
