It may seem a little niche, but I've been searching for this exact device for years. I was prepared to be let down by some aspect of it; so many "MPPT" controllers are fake (fixed PWM), and so few manage PD correctly. I was a little worried the wire would be soldered in place. My fears were for naught. This little device is *perfect* in every way - barrel plug connection (so easy to pack), fantastic build quality, crazy efficient, and a true MPPT with buck/boost controller. I thought it was too good to be true, but I was wrong. One of my use cases was charging my 15V laptop from standard 5V USB-A. My laptop isn't well behaved (doesn't throttle back current consumption as the input voltage falls), and it does put a standard 2.1A 5V charger into overload when the laptop demands more than ~10W (as it should), but it does charge intermittently (~30% duty cycle between resets), which is exactly what I wanted for emergencies. It, of course, charges everything I've thrown at it just fine with my 60W folding panel. 5 stars. Does what it says on the box!

I hike a lot and have a small foldout panel for my phone and my flashlight in an emergency. It takes forever to charge my phone even a few percent with the small panel. With this device in just 30 minutes it had charged enough for me to use it for the rest of the hike. I’d never heard of these things but I wish I woulda had one years ago.

Shipping was fast the unit is awesome, just plug it into your solar panel and start charging your USB device. Super easy and convenient.

Cool gadget

Great— I charged my GoalZero Sherpa 100PD with this device. I charged at 55 watts from a 100 watt solar panel. This is a excellent addition to ones backpacking / car camping kit!