Simple Solar light circuit version II using Li-ion battery

Solar light circuit

Previously, we had built the Automatic Solar Light circuit and had been using it for many months. It has fair efficiency for everyday lighting. But this circuit has two problems: a dim light level and batteries that are hard to find and quite expensive. But now my daughter has built this Simple solar light circuit … Read more

Simple 1.2V AA Ni-MH Battery Solar Charger circuits

Simple 1.2V AA battery Solar charger circuit

This is a simple 1.2V AA battery Solar charger circuit. Imagine, if you want to charge only one or two 1.2V AA Ni-MH batteries, and must be charged outdoor without home electricity. What could we do? If what you have are plain components. Is it possible to use those components? to create a circuit according … Read more

Outdoor solar lights circuits

Chayapol is making Outdoor solar lights circuits

My son needs lighting around the house at night. But that point is no AC lines, it’s hard wiring. We happen to have the 12V battery, LED lamps and Solar cell. Thus was born the idea to create the Outdoor solar lights circuits. It saves electricity costs. The LED lamp will light up the night itself, and closed at lunchtime. The charging power from the 12V solar cell to the battery.

We use the 12V 2.5Ah battery and The LED lamp 12V 3W. It can be used for about 5-8 hour. The 12V solar cell charging is 12V 10watt. While very light, a voltage of approximately 20V at current 0.6A can use the battery.

In this solar led light circuit project, I and He together to create.
1. At night, LED lights because of the energy from the battery.
2. Lunch, the LED will turn off and the energy from the solar cell will charge to the battery fully.


In the schematic circuit diagram, we add D1 to determine the current battery charge only one way.

simplest 12v solar charger circuit
The Simplest 12V solar cell charger circuit

And we apply the relay when the day some the current flows through the coil of the relay with D2.

simple 12v solar light circuit
The complete simple solar cell light circuit diagram

Making the contact C to NO, so no current flows through the LED. But the dark without electricity from the solar cell to coil cause the contact C to NC to connection the current so flow to LED light up. D2 is protector the current feedback from the coil relay to the solar cell.

Then we make it please see below.
Figure 4 install the solar cell

Figure 5 We hold the solar cell on the wood.

Figure 6 the connection and test battery charger

Chayapol is making Outdoor solar lights circuits

Figure 7 He is wiring his super solar!

Figure 8 He is showing his projects.

Figure 9 next viewing

We installed this project to actually use it.


Automatic LED solar light 2

My son and I build the Automatic LED solar Light is version 2. It has a higher performance, is brighter as Figure 1 compares the version 1 (left) and the version 2 (right). Because we use LED grow larger, but use a 12V battery as the original.

Figure 1

DC current measurement techniques
My son wants to know how many current the 12V LED lamp use? So I teach measuring the current of the devices. It’s easy but be careful high current, might hurt your meter.

How to
First of all, set to DC current range. Then, connect the wires in series to load. Next, apply current to the circuit.
As Figure 2 we test the 12V relay coils,it can read: 0.03A

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