Review on High-Efficiency 20W 12V Solar Panel Battery Charger Kit | 20 Watt 12 Volt Monocrystalline PV 🔋 Module for Car, RV, Marine, Boat, Caravan Off-Grid System | Includes 10A Charge Controller + Extension Cable by Yousef Clark

grabbed 2x 12V SLA batteries and popped them into this panel to charge them up. The controller has an integrated USB port that makes it easy to connect devices. We plugged in our cellular modem about 50 feet from the house and didn't need to hook up power. So far the controller seems to automatically back up the batteries with no issues. The cold weather is coming so I will update the information as the winter season approaches.