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AA battery solar charger circuit principle

2016-05-10 08:33  
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This article explains the AA battery solar charger circuit theory to explain. The circuit is simple but effective. For your more thorough grasp of this principle, we suggest that you can know more about some of the important components of the circuit, such as: 1N5818 . Two versions of the circuit shown in the diagram, the solar cell panel 8 is recommended with a diode in the circuit. This diode prevents the battery from discharging through the cell in the evening and eight cells promotes voltage sufficient to compensate for the voltage drop across the diode. For an eight solar panels, connecting and disconnecting the J1 J2 jumper. 7 for a solar cell panel, the connection of jumper J1 and eliminate SC8 and D1. Typically, the jumper is not necessary, they are shown in a schematic diagram to illustrate the two methods to build the circuit. Developed to determine the size of solar cell circuit board, allows approximately 1/4 "(1 cm) extra space on all four sides. Cutting a piece of perforated circuit board, a solid PC board, a 1/8" clear organic Glass in this dimension. File all three to achieve smooth edges. Drill two holes down the center line three, held together while allowing space between the screw through the solar cell. Mount two battery holders in the blank boards with screws or silicone rubber. If no wires to connect the solar cell welding thin wire to the battery. Wrap wires can be very suitable for it. Be careful not to overheat the solar cell, using a small soldering iron, only a few seconds in contact cells. Solar cell should be fixed to the perforated plate with a drop of silicone rubber on the back, or they can be held in place with wire solar cells if you have the right cells. All cell lines in the series, minus added, connecting the two end wires will no longer line, go to the diode and battery holder. Generally, the metal back of the positive connection and the negative connection of the solar cell is the blue wire grid (front) side. Using a pair of 3/4 inch 632 machine screws and nuts and washers, make a sandwich of three boards. Use nuts or washers gap between the plate layer, it is important to prevent any contact solar cells and plexiglass. Solar cells are very fragile and will break in the compression. Insert two rechargeable batteries in the battery holder, point the device in the sun, let the battery charge for several hours. Larger cells need more time to charge. The solar array should be placed in direct sunlight, it should not in any way obscured. This may be a good idea to monitor the battery voltage in the first cycle of some of the costs will know how long it takes to reach a full charge. Do not let rechargeable battery overheating. If the charger is left outdoors in the summer, excess heat can cause them to leak electrolyte cell cushions, destroyed cells. Operate charger in the room behind the window may help reduce calories. Operating behind the window will reduce the charging current, resulting in a longer charging time. The circuit for rechargeable alkaline batteries, nickel cadmium batteries, or any other charge, there is a potential 1.5 v or lower each cell. If you build 7 cell version (no diode), clear cell at night to prevent discharge through the solar cells. 

For higher power solar systems, see theCirKitssolar charge controller circuit board kits.

SC1-SC8  single photovoltaic solar cell, .5V, 20 to 50 ma output each in full sun
D1  1x 1N5818 Schottky Diode
Battery Holder 1x 2 cell AA or AAA battery holder
Battery  2x AA or AAA NiCD or NiMH rechargeable cells
Perf Board 1x for mounting solar cells
PC board 1x solid piece for mounting battery holder
Plexiglass 1x approx. 1/8" thick, cut to size
misc  hardware, wire


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