I used this specific product to power a Raspberry PI Zero 2W with a foldable solar panel 40W. It had some issues with the DC Input as the microcontroller would get stuck and I had to unplug and plug it back in every morning. This probably happens because when the sun rises or sets, the voltage of the panel is not stable. Maybe it was the solar panel that I used that was causing the problem. Generally, there aren't many references to this specific product on the internet, so it's a bit difficult to get support. Overall, it has been working for 2-3 months. To solve the issue with the sticking, I connected the DC Input to the USB-C output of the panel I bought (it had DC-OUT, USB-A, USB-C) with an adapter cable that requires 20V through PD (Power Delivery, a technology like the one used in mobile phones that requires the appropriate voltage to charge even if the charger is 100W and the phone needs, for example, 25W).