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Which lamps can be directly connected to a solar cell?
Incandescent
Metal Halide
Compact Fluorescent
LED
LED
LEDs (Light Emitting Diodes) are DC-driven semiconductor devices that can be directly powered by the DC output of solar photovoltaic (PV) cells. Unlike gas-discharge or incandescent lamps, they do not require high starting voltages or AC inversion for basic operation.
LEDs (Light Emitting Diodes) are DC-driven semiconductor devices that can be directly powered by the DC output of solar photovoltaic (PV) cells. Unlike gas-discharge or incandescent lamps, they do not require high starting voltages or AC inversion for basic operation.
P=VтЛЕI тАФ Power output of the solar cell matches the power input required by the LED.
R=ILEDтАЛVsourceтАЛтИТVLEDтАЛтАЛ тАФ Resistance required to regulate current from a variable solar source.
A solar cell produces a DC voltage proportional to incident solar radiation. An LED is a PN-junction diode that emits light through electroluminescence when forward-biased. Since both are DC-compatible, they form a direct energy-transfer path, often requiring only a simple current-limiting resistor to protect the LED from voltage fluctuations.
Solar PV cells generate Direct Current (DC).
LEDs are inherently DC devices requiring low voltage.
Incandescent lamps (Option A) can technically run on DC but are highly inefficient compared to LEDs.
Compact Fluorescent and Metal Halide lamps require AC and high-frequency ballasts/starters.
High luminous efficiency
Direct coupling reduces losses from DC-AC conversion
Longer operational lifespan
Low heat dissipation
LEDs require constant current regulation for dimming
Solar output is intermittent and dependent on irradiance
Solar street lighting
Portable solar lanterns
Off-grid home lighting systems
Metal halide and CFLs require a ballast to provide an initial high voltage surge for ionization, which a simple solar cell cannot provide without an inverter circuit.
Incandescent bulbs produce excessive heat and consume high current, leading to rapid depletion of solar battery storage.
D is correct тАФ LED lamps are semiconductor devices that operate directly on the DC output provided by solar cells without needing inversion.
Always remember that in solar applications, the load should match the DC nature of the supply to avoid conversion losses; hence, LED is the preferred choice in modern illumination engineering.