DIY Simple Solar Lamp

by sushrutphutane in Circuits > Electronics

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DIY Simple Solar Lamp

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Lets make a simple solar lamp for nameplates,etc

We will make a very simple circuit using a single NPN transistor

You can replace any components with alternatives

You can design and print the casing the way you like.

Supplies

You will need the following:

SL100 transistor

Solar panel 5V

18650 Liion Cells

LDR and 4.7k pot

1W Leds

Capacitors and resistors

Optional:

3d printer

Nut and bolts

Circuit Diagram

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This is the basic circuit diagram

The resistor value will adjust your output current for led hence brightness

Pot will adjust the sensitivity to sunlight

IMPORTANT

I used a simple voltage step down to get a constant voltage of 4.2v for charging

and used a big battery as buffer against over charge and over discharge

It is recommended to use a BMS for avoiding these issues

Design and Print Casing for Your Lamp

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I used Fusion 360 and Ender3 V2

You can use anything as per convenience

Installing Electronics and Assembling

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I made the circuit on a small perf board for convenience

Roughly pasted everything using feviquick and fevicol

Make sure to test everything before installing

For attaching the cover I pasted the nuts of in the corners and installed using the bolts

from outside

Final Checking and Installing in Required Place

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Your New Solar Lamp Is Ready!!

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