Abstract Solar energy is a huge amount of renewable energy,that is one of the major alternative energy of the large number of applications of fossil fuels ,that is one of the most clean energy Human beings can be used directly.Therefore, development and utilization of solar energy is of great significance.The power is one of the most widely used and applied the most convenient energy.The solar energy into electricity and then to use,that is one of the most reasonable way for the solar energy development and use.
This thesis is a solar charging and discharging of the circuit control design,Solar chargers use solar panels (18v), after the solar radiation light energy into electricity ,Through the control circuit,then Re-charge the battery directly.The control circuit to achieve sufficient to prevent reverse battery, over charge, over discharge, over current, short circuit.
Key words: solar, battery, power, over charge, over discharge, reverse charge