21 Sep '11, 10am

Energy Solutions: Net-Zero Families, Not Net-Zero Homes

Energy Solutions: Net-Zero Families, Not Net-Zero Homes

Saturday found me helping a friend install new batteries for another friend's off-the-grid solar power system. We had fun getting the system back up and running and watching the solar-powered watts come in on a beautiful September day. At one point my friend asked me to use his multimeter to read the voltage of the batteries. No problem: I put the two testing probes in place on the batteries and got the desired reading. He then asked me to reverse the probes to see if the reading also reversed, as expected. However, I switched the probes back and forth several times — or at least, I thought I did — while the reading unexpectedly remained the same. After a minute he said, "Wait, you're just moving your hands back and forth between the probes — you're not actually moving the probes." He was right, and we had a good laugh about that. Some changes make a real difference, and s...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/energy-sol...

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