How to Build a Solar Battery Charger?

Creating a solar battery charger can be inexpensive, and provide savings in the future from the cost of new batteries. Simple steps to make solar battery charger are as follows:

• The solar panel must more than 1.5 volts from the sunlight power to charge an AAA battery. Majority of the solar panel are capable of developing 1.5 volts. Soldering them in series will further boost the output voltage. The connection should be from the positive lead of the first panel and with the negative lead of the second panel.
• Connect the last positive lead to one side of the diode and the other side to the positive terminal of the battery. Using a plastic battery holder one can charge the batteries. For more solar panels solder the remaining positive and negative leads to the terminals on the holder.
• Mount the solar panels soldered to the wood board to give it a solid surface. Apply a small amount of glue to the back of the each panel and affix it to the wood. Do not press hard as the solar panels are likely to break.
• Place a battery in the holder and put solar battery charger under direct sunlight. The time taken to charge a battery is proportionate to the output voltage. For example, if the solar battery charger puts out 3 volts, then the battery may charge to 95% in eight hours.

A note of caution, do not connect solar battery chargers in “parallel.” 

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