Solar charge controllers are essential for ensuring the smooth functioning of a solar panel and its battery. This model features full electronic protection and fully automatic operation with a PWM charge mode (SOC). The unit has large terminals, with considerable distance between each, as well as a digital LED display. Also features temperature compensation provided by the built-in external temperature sensor. This 20A model is suitable for charging 12V/24V DC Lithium batteries. Finally, there are two built-in USB slots, allowing you to charge a wide variety of devices.
Illuminate both your room and your mind with this ingenious Periodic Table Lamp.
Get one of the craziest and coolest kaleidoscopes around!
High-quality green laser pointer projects a green dot up to an incredible 2 miles away.
This is a great clean heat demonstration model for the classroom setting!
This hanging Galileo thermometer is a gorgeous way to display the temperature outdoors!
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.