Nine-year-old Maria Johnson shows off the energy indicator light on the battery system. The family checks the energy level periodically or at the end of the day to monitor the batteries. There isn't much maintenance for the system itself, but people who have these off-grid renewable-energy systems need to make sure they don't damage the batteries by regularly running them all the way down.
November 17, 2011 3:59 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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