Published:2013/11/4 20:18:00 Author:lynne | Keyword: LDO Solar Charge Controller | From:SeekIC
This Low Dropout Voltage (LDO) solar charge controller is a variation of the previously posted 12V LDO controller. It is optimized for charging a 6V lead-acid battery with a 9V solar panel. Minimum voltage drop is less than 1V. It uses a simple differential amplifier and series P channel MOSFET linear regulator. Voltage output is adjustable. It may also be applied in two or four cell lead-acid applications (4V & 8V).It is not recommended for 12V applications.
6 Volt solar charge controller schematic
6V Solar Charge Controller Specifications
Max solar panel rating: 50W (8A, 6V nominal) (open circuit voltage: 9 to 10V)
Output voltage range: 4.7 to 9.8V (adjustable) (not recommended for 12V applications)
Max power dissipation: 16W (includes power dissipation of D3)
Typical dropout voltage: 0.9V @ 8A (less @ lower currents)
Maximum current: 8A (current limiting provided by solar panel characteristics)
Voltage regulation: 80mV (no load to full load)
Battery discharge: 1mA (Chinese controls discharge at typically 5mA)
LED indicators:
RED: Solar panel active
GREEN: Series regulator limiting current (fully charged or topping off)
Reverse battery protection: Control shuts down if battery is inadvertently connected reverse
Operation at lower current/power
While designed for 8A, 50W, it will function just as well at much lower current /power.
LDO Solar Charge Control Photos
Perf board—sorry, no circuit board artwork at the time of publication.
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