Add a Solar Panel to Keep Your Backup Battery Topped Up

A few weeks ago, I wrote about building a simple, home backup power system for charging phones during extended electricity outages. However, there's a limitation to any battery system, and that is that any battery power supply will eventually become depleted. I reckon to get a theoretical 13 days out of mine. What happens, in a catastrophic event, if grid power isn't restored at the end of 13 days?

Source: http://ectnews.com.feedsportal.com/c/34520/f/632000/s/288fd92c/l/0L0Stechnewsworld0N0Crsstory0C7730A0A0Bhtml/story01.htm

HEWLETT PACKARD CO HEARTLAND PAYMENT SYSTEMS GOOGLE GOOGLE FORMFACTOR FISERV FIRST SOLAR