Four years ago, we installed a net-metered photovoltaic system on our barn roof. Photovoltaics, or simply PV, is a term that means “light electricity” or solar energy.
We appreciate our PV system. On sunny days, when our system produces more electricity than we use, it runs our meter backward as power flows out into the energy grid. At night and on cloudy days, when we’re using more power than we’re producing, we draw electricity in from Alliant Energy, our utility. At the end of each month, we pay the “net” so it’s called a Net-Metered System. This eliminates the need to have storage batteries. We’ve had a monthly bill as low as $5!
But what happens when the grid goes down? It did on August 10, 2020, when a derecho roared through Iowa with 140 mile an hour winds. Hundreds of miles of wires were torn down as trees crashed into them. We joined thousands of other homes without power.
So, did our PV system power our lights, computers, and television? Nope. We used candles and lanterns when it got dark and couldn’t power our computer, television, or any other electric appliance for about two weeks.
Net-metered systems, like ours, have an automatic switch built into them so they don’t export electricity back to the grid when it’s down. It’s a safety mechanism designed to prevent a utility employee working to restore power from getting a shock. Our system produced electricity during the blackout, but it just dissipated. As soon as our power was restored the PV system again sent power outward.
An Important PV Safety Tip
Our PV system survived the wind intact but others were ripped from roofs and tumbled to the ground. A PV panel laying on the ground upright makes electricity. Grabbing wires or the panel can give someone a tremendous shock. If a PV panel is on the ground stay away……or cover it with a tarp to darken it so it doesn’t produce electricity. It’s safest to wait until after dark to flip it.