More - Solar Night light

649

11:01:43

This circuit has was inspired by a circuit by @Wesleytg 

Using a D.C. Voltage source as the solar panel (simulating charger at 14.2v).

Using capacitor as battery (either 12v led acid or a 12 battery pack).

P FET is used to automate led turn on/off via 1 meg LDR and diode isolates solar  charger while sun is not charging capacitor (Batteries).

Use switch to initiate change between panel day and night and LDR resistance is way less than 10k in full sunlight.  

Depending on the systems battery and panel capacity, would decide the led configuration, low system capacity maybe 2v led at 20 mA. Higher system capacity maybe a Cree 1W - 5W higher power led.

published 9 years ago

hurz

9 years ago

An extra LDR seems to me a little redundant. Isn't a solar cell not already like an LDR? Both can give the sane amount information, sun present or not present.

BillyT

9 years ago

@hurz, I initially thought the same, the difference is that when the solar panel voltage is less than the battery voltage to the led starts to illuminate, the addition of a ldr gives it more of a knee to the switch point.

Rockthill

8 years ago

Hi, need help with a solar charging system and motor controller for a single direction motor in dewalt 14.4v, could you two help? You'd get mailed a prototype to keep, and name on patent if it goes that far.

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