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17. Solar Charge Monitoring of the
Lithium Rechargeable Battery
Test setup: Solar module, plug board, ashing LED, red LED, orange LED, Schott-
ky diode BAT 42, electrolytic capacitor 1,000 µF, resistor 1 kΩ, alligator clamps,
lithium rechargeable battery
Fig. 060 shows the test setup of a simple charge monitoring system for solar
charging of the lithium rechargeable battery. The upper red LED indicates the
owing charging current and is lit while the lithium rechargeable battery is charged.
The middle ashing LED (»B«) in connection with the diode and the orange LED
starts to light up then and thus shows when the rechargeable battery is half or fully
charged. Since D1, D5 and the red LED are switched in series, the LED will only
ash starting at a voltage of approx. 3.8 V.
Fig. 060: Test setup on the plug board