JuiceBox has a lot going for it and wins our top spot for best features and overall design. It offers an adjustable capacity of up to 40 amps, has integrated cord storage and a safety locking mechanism. We also appreciated the app control via the built-in Wi-Fi, so there’s no need to fiddle with Ethernet cables or SIM cards.

The app monitors battery status, gives estimated charging times, assigns current, and replenishes for future use. Another advantage is that you can pair it with your Amazon Echo to easily activate it using your home voice commands.

Power can be supplied via either a 14-50 plug, or a hard wire kit option. The charger is weatherproof, Energy Star certified, and includes a three-year warranty.