The battery which is selected for this application will have an inbuilt protection circuit that will protect the battery from overcharge, deep discharge, and short circuit related conditions. If you are completely new to Lithium batteries, you can check out this Basics of Lithium-Ion Batteries article to understand better about batteries. Therefore, a 7.4V Lithium battery is used for a power source in this project, the same is shown below. So a 7.4V lithium battery will be able to provide a minimum of 6.4V (fully discharged) to the maximum 8.4V (fully charged). The LEDs used in our project are shown below. Therefore, if two LEDs are connected in series, the forward voltage will be 6.4V. The LEDs we are using in this project are normal Chinese LEDs with an operating voltage of 3.2V with a maximum of 4.5V forward voltage. Because the voltage and current rating of the light decides how the circuit can be designed. ![]() By load, we refer to the type of Garden Light that we will be using in our project. That being said let's start building our homemade solar light!! Solar Garden Light Designīefore choosing the value of components and getting into the circuit diagram, it is essential to choose the load for our project. Unlike other circuits, we will not be using a microcontroller or sensor, because the idea of the project is to reduce the component count to reduce the price and complexity of the circuit. The solar panel will charge a lithium battery during day time and when it becomes night time, the battery will turn on the lights until its day time again. In this project, we are going to build a simple and cheap DIY solar garden light. In some of our previous articles we have built few solar energy-related projects like solar-powered cell phone charger and solar inverter circuit. These lights will have a battery that will be charged through a solar panel in the day time and during the night time the energy from the battery will be used to power the lights and the cycle repeats. This is where Solar-powered garden lights come into the picture. These lights will normally be placed inside the garden, far from electrical outlets because it is not a good idea to run wires through your garden soil which will be wet and toiled most of the time. For those who have a keen interest in gardening, a garden light would provide an option to admire the beauty of their plants even during the night time.
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