high power solar day lamp

by:EME LIGHTING     2020-04-10
Background: This article is a continuation of the previous article entitled \"simple solar lights for 15 years\", which can be obtained through the following link: in the previous article, A structure of a small 5w sky lamp is described.
Let\'s introduce how to make a high-power lamp.
In addition to providing more light, this design has the following advantages: 1. 10% more light. 2.
For the increased power output, the current is still the same as the 5w version.
So it still uses the same cheap cable. 3.
The improved structure provides better light reflection and safety for the led against damage. 1.
Aluminum U Channel 2.
Wood strips 3. Wood screws 0. 5” long 4.
Plastic or fiber washers with an inner diameter of 3mm 5.
23 white LEDs with grade 6 of 1 W.
3-way patch panel and mounting screws/nuts. 7.
4 solar photovoltaic panels rated at 12V 5w (
Or two 24v 10w panels)8.
See the previous article, which provides step-by-step guidelines for making LED arrays.
The only difference is that we made a larger array with 23 LEDs.
High power day light circuit diagram as shown in figure shown in. 1.
It consists of 23, 1w White LEDs (LED1 to LED23)
The current limiting resistor connected to the LED array is 33 Ohm 2 w.
As shown in the figure, four solar photovoltaic panels of 12v 5w ratings are connected in series.
The positive pole of the photovoltaic array is connected to the resistor, and the negative pole of the photovoltaic array is connected to the cathode of the led23.
Alternatively, instead of 4 panels, we can connect two PV panels with a 24v 10w rating.
The circuit diagram of this alternative design is shown in the figure. 2.
Compared with the earlier design, it is recommended here to make a slight improvement in the structure of the LED array.
As shown in the close-up photo in the figure, the LEDs are moved to the inside of the aluminum channel3.
Similarly, as shown in the side view, the wood bar is moved to the outside of the aluminum channel4.
Figure 5 shows a finished LED array with a translucent plastic cover.
This lid can protect LEDS from dust and also reduce glare from LEDs.
Figure 6 shows the completed unit.
Four PV panels of 12v 5w ratings are connected to each other to form a panel array.
This will make it easier to install PV boards on the roof.
The cable is connected to the LED array from the panel.
Figure 7 shows what happens when the LED array is turned on sunny days.
It provides quite good light even on cloudy days.
This daytime light can be used where the lights need to be turned on during the day.
Due to the use of millions of lights during the day, this light will be used in offices, homes, shopping malls, factories, etc.
Figure 1 shows the circuit diagram connecting multiple LED arrays. 8.
Two PV panels with 24v 30w rated voltage are connected in series here.
In the output of this photovoltaic array, three LED arrays consisting of 23 LEDs are connected in parallel.
The current limiting resistor with a rated current of 33 Ohm 2w is in series with each LED array.
This will provide light equivalent to 3 tube lights.
The advantage of this circuit is that it requires less cabling, since only one cable is needed from the PV panel to the interior of the building.
This wire should support the current drawn by 3 LED arrays (about 1 amp).
Inside the building, each LED array can be connected in parallel by using thinner wires.
By increasing the rated power of the photovoltaic panel, we can connect more LED arrays in parallel.
Finally, although the light during the day cannot provide light at night, it still has the advantage of not using the battery.
Battery life is very short.
By avoiding the use of the battery, the life of the sky lamp obtained exceeds 15 years.
It provides maintenance-free operation without even the switch turned by the user.
What is needed is to determine where it can be used very effectively.
Email: avd80 @ yahoo.
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