Review on 🌞 Sunnytech Mini Solar Panel Module DIY Polysilicon Solar Epoxy Cell Charger B031 - 2W 6V 330mA by Cedrick Ayudara

I connected two of these in series to power a small audio amplifier. They work well, especially since the amp is quite forgiving. Works on any voltage from 9 to 24 volts. A charge controller is therefore not required. The no-load current is about 300 mA. But all solar cells are sensitive to heat, and as they heat up, the current drops significantly. These panels can power the amp at moderate volume levels in direct sunlight. I connected them to a lithium ion battery with a diode to prevent reverse power. When I tested in direct sunlight on a hot day, the current in the batteries fluctuated between 150mA and 30mA when heated in the sun. These panels will not power any significant load. But they can power a small audio amplifier with about 2 watts. As a bonus, they charge the batteries a little and extend the life of the batteries. It was an interesting and useful project. — Chris.