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1 - 200 Transistor Circuits. This will clear-up a lot of mysteries of the solar panel. Many solar panels produce 16v - 18v when lightly loaded, while other 12v solar panels will not charge a 12v battery. Some panels say "nominal voltage," some do not give any value other than 6v or 12v, and some specify the wrong voltage. You can't work with vague specifications. You need to know accurate details to charge a battery from a solar panel. There are 3 things you have to know before buying a panel or connecting a panel to a battery. 1. 1. 2.

You can clearly see the 11 cells of this panel and it produces 6.6v when lightly loaded. This panel claims to be 18v, but it clearly only produces 14.4v. 3. ADDING A DIODE Some solar panels will discharge the battery (a small amount) when it is not receiving sunlight and a diode can be added to prevent discharge. PREVENTING OVERCHARGING There are two ways to prevent overcharging the battery. 1. Here is the simplest and cheapest regulator to charge a 12v battery. Adafruit Industries, Unique & fun DIY electronics and kits. Jameco Electronics - Electronic Components Distributor. The Jameco Difference Jameco has been in business for over 35 years and carries over 50,000 semiconductors, passives, interconnects, electromechanical, power supplies, LEDs and other popular electronic components. Learn More About Jameco » At Your Service Talk to a live agent ortechnical assistant.

Monday-Friday 6AM TO 5PM PST Just call 1-800-831-4242 Will Call Hours Monday-Friday 8AM TO 5PM PSTClosed Holidays 1355 Shoreway Road, Belmont, CA 94002Click here for directions Copyright ©2002 - 2014 Jameco. Pololu Robotics and Electronics. Arduino - HomePage.