I just found something else slick on Amazon, there are quite a few of these on there, they are solar battery arrays! They are quite expensive but may be worth it. It will set you back around $1500 but they are 100 Watt solar arrays that will charge a power unit during the dat and can easily power your entire house all night. If you want to have a look the page on Amazon is here:
Amazon.com : solar generator
Amazon.com : solar generator