Simple Solar Day Lamp which lasts for 15 years

Picture of Simple Solar Day Lamp which lasts for 15 years
All buildings have areas which are in darkness during day time. In such locations we can use a solar day lamp. The lamp will turn ON when the sun rises and will turn OFF when the sun sets. There are no switches to be turned on or off. It will convert the previously dark area into perpetually bright area through out the day.

The total cost of this lamp will be about 700 Indian rupees.
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Step 1: Material required for making solar day lamp

Picture of Material required for making solar day lamp
Material required:
You need following material (see figures)
1. Aluminum Channel
2. Wooden batten
3. Wood screws 0.5” long
4. Plastic or fiber washers 3 mm inner diameter
5. 5 White LEDs 1W rating
6. 3 Way terminal strip and mounting screw/nut.
7. Solar PV panel 12V 5 W
8. Wires

Step 2: Circuit diagram of the solar day lamp

Picture of Circuit diagram of the solar day lamp
The circuit diagram of a very simple day lamp is shown in the figure. It consists of a Photovoltaic (PV) panel of 12 Volts 5 Watt rating. The positive terminal of this panel is connected to a 15 ohms 2 watt resistor. The other end of this resistor is connected to the anode (+) terminal of LED1. The cathode (-) terminal of LED1 is connected to anode of LED2 etc. Thus 5 LEDs are connected in series as shown in the circuit diagram. The cathode terminal of LED5 is connected to the negative terminal of the PV panel.

Step 3: Aluminum channel with “T” slots and wooden batten

Picture of Aluminum channel with “T” slots and wooden batten
Take an aluminum channel of 1” x 0.5” dimension as shown in the figure. It should have “T” slots cut. (Such channels are easily available in hardware shops). Cut this aluminum channel such that there are 5 “T” slots and one hole each at both the ends. Remove burr from edges and from “T” slots and clean the channel. Take a wooden batten of 10 mm X 10 mm size. Cut batten so that it’s length covers all 5 “T” slots and hole at one end as shown in figure.

Step 4: Marking the wooden batten (1)

Picture of Marking the wooden batten (1)
Place the wooden batten centrally inside the channel and mark the holes.

Step 5: Marking the wooden batten (2)

Picture of Marking the wooden batten (2)
Draw center lines for the marked holes. Also at a distance of 23 mm from center of each mark, draw a + sign.
avd80 (author) 1 year ago
Please also have a look at this new article "High Power Solar Day Lamp" at following link.


hshah22 years ago
Thanks for Info .. Approx cost???
hshah22 years ago
Dear Friend,

where i can get solar panel in India - Ahmedabad ?
can you help me please...
satpathi hshah22 years ago
Pl indicate suppliers of Solar panels in Bangalore .
avd80 (author)  hshah22 years ago

You can contact Surana Ventures. They might send you to Ahmedabad by courier.

Marketing Executive
5th Floor, Surya Towers,
Sardar Patel Road,
Secunderabad-500003 (A.P.) India.
Contact No.+ 91-40- 27845119, 44665799
web: www.suranaventures.com
Pretty neat, 1 thing that i would recommend is to get a piece of plastic-wrap or film to put over the PV panel. Gives you rain protection and will keep dust from directly touching any circuit which could be fragile.
alexx223 years ago
nice instructables :D very usefull
avd80 (author) 3 years ago
To enhance the utility of this day lamp following additions could be made to the basic circuit. It consists of two LED arrays, one PV panel and one two-way switch.

1. Make two units of LED array and install them at two locations where light is required.
2. Take a two-way switch. This has three terminals. Connect positive wire from PV panel to the middle terminal of two-way switch.
3. Connect the remaining two terminals of the two-way switch to the respective resistors of each of the LED array.
4. Connect the negative wire from the PV panel to the negative terminals of both LED arrays.
5. Now you can turn ON any one of the LED arrays by using the two-way switch.

(Abhijeet Deshpande)
profpat3 years ago
nice one! i like it!
Awesome and very low cost. :D Great work!