I bought this portable solar panel for my RV. It is based on a pair of flexible 100 watt panels. I bought this controller for 30 amps so I'm hoping to increase the number of panels to 4 if needed. In the high desert near Bend Oregon on a clear 72 degree morning my battery was fully charged by noon. I think there are cheaper controllers out there, but I chose this one because it has 3 charging stages, is solidly built, and includes a battery temperature sensor. Sensor and remote monitoring. Only time will tell but in the short term I am very happy with this purchase.
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