Conrad Course material 10127 14 years and over 10127 Manual De Usuario

Test setup (as before): Solar modules, plug board, LED, battery holder, recharge-

able battery 
Depending on rechargeable battery type, there is a number of options for custo-

mising the solar modules so that the rechargeable battery is charged in the best 

manner. The number of solar cells in series leads to the maximum upper charging 

voltage. The size and quality of the solar cells determines the maximum charging 

current. The charging current of course also depends on the radiation energy of 

the sun. 
In smaller NiCd and NiMH rechargeable batteries, it is a simple option of doing this 

via the maximum charging current from the solar module. 
Lead acid and lead gel rechargeable batteries in their simplest versions, in cont-

rast, are controlled via the amount of the charge end voltage.
A „large“ solar lead rechargeable battery with 12 V rechargeable battery voltage 

can thus be easily charged at the solar module with a maximum cell voltage (idle 

voltage) of 15 V. The charging curve adjusts on its own. The higher the charging 

voltage of the rechargeable battery to be charged rises, the lower will the charging 

current that the solar module supplies be (automatic adjustment). This charging 

type is practical but not perfect for complete usability and service life of the rechar-

geable batteries.
The alignment of the solar module is decisive. Take the solar module between your 

thumb and index finger (without casting a shadow on the surface) and align the 

surface of the module at a right angle to the light source (sun). When will the LED 

light up more brightly? Vary the alignment to the light source by moving the solar 

module back and forth, and observe the LED. The more brightly it lights up, the 

bigger the charging current that flows from the module to the rechargeable battery. 

The more vertically the light hits the solar module, the more light energy 

can be converted to electrical current by the solar cells and the bigger the 

charging current that will flow from the module to the rechargeable battery.