![]() There’s also a 3V LDO regulator to power the microcontroller and motion sensor. Key component in the main circuit board is an 8-pin microcontroller used to sample the solar panel output voltage (for night detection) and to monitor the PIR motion sensor output for driving the light matrix in right time. Single-sided main PCB of the solar light shows mostly surface mounted devices (SMDs). Thin layer of something that’s used to cover the face sadly made the light matrix scratchy and translucent. The waterproof light matrix consists of a bunch of 20 SMD LEDs soldered in parallel on an unfinished PCB, most likely without current limiter resistors. The ‘loaded’ solar panel, however, delivers a maximum of 4.2V when in moderate sunlight and the output current is just 56mA (may be an inferior solar panel). Surprisingly the Li-Ion battery is a type with internal protection circuitry that’s supposed to simplify the design of the charge/discharge supervisory circuits. The battery is inserted in a battery holder molded on the rear panel of the enclosure (nice thing) and it’s a 3.7V/1200mAh Li-ion 18650 battery as claimed in the specification. Removing all the 4 screws reveals the inside parts and the enclosure frame. Now to the teardown to look at the internals of the solar wall light. Here’s its specification as printed on its carton: The rear-top of the device contains the small mounting hole that can be used to keep the unit screwed on the wall. The device itself seats at a slight angle while the motion sensor power button, and the LED panel sit at a much steeper angle. The solar wall light is designed to be mounted on a wall that has direct visibility to the sky above it as its solar panel sits at the top, perpendicular to the base that the unit is mounted onto. ![]() Surprisingly, Amazon seller delivered my item within 2 days just after the buy thus I took an early flight. The compact, and claimed to be waterproof, solar wall light has a motion sensor (and a light sensor mechanism) so it wakes up only on nighttimes when a valid motion is sensed within its detection zone, remains lit for about 15 seconds, and then turns off automatically. Admittedly it’s not a good fit as a powerful street light but reasonably good for pathway and garden lighting if that areas get amble sunlight on a regular basis. ![]() I stumbled across this Chinese solar wall light last week in Amazon while searching for automatic LED street lights.
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