A PWM solar <a href="https://en.wikipedia.org/wiki/charge_controller" class="extiw" title="w:charge controller">charge controller</a> used as part of a garden/home solar cell panel installation in Wisconsin. To keep the energy consistent and under control a charge controller is necessary to watch the energy levels and determine how many volts it is putting out. It also helps to keep the batteries from getting overloaded.
Photo by Cody Kabus. – <a rel="nofollow" class="external text" href="https://www.flickr.com/people/37916456@N02">U.S. Department of Energy</a> from United States
2017-08-13 16:10
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/departmentofenergy/36775931446/">Kabus_000245_171295_516064_4578</a>