Adding Solar Powered Rechargeable Batteries to the Kitronik LED Strip

We're always excited to release new kits and modules, especially when they offer the convenience of battery power. Batteries give users the freedom to choose the location for their projects. However, the downside is that you'll need more batteries... or will you?



In this simple guide, we will show you how to easily add a solar powered recharging circuit to our new Kitronik LED Strip with Solder Free Connections. This resource is perfect if you plan to create an enclosure for your kit and want to include a sustainable power source in your design. It is based on the guide originally created for the Kitronik Solar Power Starter Kit. The great thing about this set-up is that it can be reused for other projects with similar power requirements. Some examples of kits that can be used with this rechargeable solar power set-up include the 5V LED Desk Lamp Kit (which comes with the Solar Power Kit), the 2157 FM Radio Kit V2.0, the 2165 Mono Amplifier Version 3.0, and the 2162 USB Fan Kit.

Read More: Spacing Solar Powered Lighting

Solar Power: A Sustainable Future

Renewable energy is playing an increasingly significant role in electricity generation worldwide. In the UK, renewable energy accounted for more than 25% of annual energy production in 2017, and this figure is expected to rise even higher in the future. Solar energy has the potential to contribute significantly to this global drive for a more sustainable future. Kitronik can help you be part of this movement by combining a few components and kits to build a simple solar charging and power supply system for various low-power devices.

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What You'll Need

  • 1 x 5.0V 130mA Polycrystalline Solar Cell
  • 1 x BAT41 Signal Diode
  • 1 x SPST Toggle Switch
  • 1 x 3x AA Battery Holder with Flying Leads
  • 3 x Rechargeable AA Battery (1300mA/h)
  • Multi-strand Wire
  • Kitronik LED Strip with Solder Free Connections
  • Alternatively, you can grab the solar power starter kit and the LED strip.

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Building the Circuit

Please note that although the LED strip has solderless connectors, you will need a soldering iron and additional connection wires to build the powering circuit. Take care when adding the kit to be powered to the solar powering circuit as connecting it the wrong way around can damage the LED module board.


The recharging circuit is super simple. The solar cell, BAT 41 Diode, and the battery holder are connected in series, as shown in the diagram below. The diode prevents the batteries from discharging back into the solar cells when there is insufficient light. The solar cell charges the batteries at a safe maximum of 10% of their total capacity.



Once the charging circuit is built, you can connect the LED strip in parallel with the charging system. A toggle switch can be added to provide simple on/off functionality. As long as there is enough light falling on the solar cell, the batteries will continue charging whether the LEDs are on or off. For more detailed information, refer to the additional resources below.

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Frequently Asked Questions

Can I use different types of batteries?

While this guide specifically uses rechargeable AA batteries, you can experiment with other battery types as long as they have the same voltage and capacity.

How long does it take to fully charge the batteries?

The charging time depends on various factors such as the solar cell's output, the amount of sunlight available, and the batteries' total capacity. Generally, it will take several hours to fully charge the batteries.

Can I use this solar power set-up for larger projects?

This guide is primarily designed for low-power projects. If you plan to power larger devices, you may need to adjust the components accordingly to meet the power requirements.

Do I need any special tools to build the circuit?

In addition to the components listed, you will need a soldering iron and additional wires to connect the circuit. Basic soldering skills are required.

Can I connect multiple LED strips to the solar power circuit?

Yes, you can connect multiple LED strips in parallel with the same solar power circuit. Just make sure the total power consumption of the LED strips does not exceed the capacity of the batteries.

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