How To Make A Solar Light Bulb Bottle [Under $20]

In this DIY guide, we are going to show you step by step how to build a solar light bulb bottle at home. It’s so easy and low cost that anyone can do as a science experiment project or last resort survival illumination kit.

Let’s get started:

Step By Step Instructions

Step 1 – Get These Materials & Tools


  • a small 5V solar panel
  • an empty water bottle
  • a 330 Ohm resistor
  • a 10 Ohm resistor
  • a small LED diode for charger indictor
  • a small LED light bulb
  • a small AA battery holder


  • Solder Iron
  • Solder wire
  • Piler
  • Wirecutter
  • Glue gun

Step 2 – Build Connection Between Battery LED Indicator & The Solar Panel

Solder charger indicator LED diode on the negative terminal on the back of the 5V solar panel

Next, solder a 330 Ohm resistor on the positive terminal of the solar panel.

Next, solder the resistor and the LED diode together after bending them together to your best ability. I highly recommend you measure how much length you need before applying the solder.

Step 3 – Build Battery Connection

Solder diode anode on the positive tab of the solar panel.

Next, solder ared wire on the cathode of diode to the battery’s positive terminal.

Next, solder a black wire to the negative tab of the solar panel

Next, solder the other end of the black wire to the battery holder

Step 4 – Build LED Light Bulb Into The Bottle Cap

Use the solder iron tip to burn a hole through the cap.

Then, glue the LED pointing down on the cap like shown below:

Step 5 – Build A Switch

Solder the switch on the battery’s positive terminal wire.

Next, solder a 10 ohm resistor on the second switch terminal.

Step 6 – Assemble The Water Bottle Light Bulb

Just twist the cap back on the water bottle filled with water, and turn on the switch!

Bam! now you have a solar panel light bulb that acts like a flood light when illuminating the water.

The solar panel will always collect sunlight to charge the battery, and the battery powers the LED.

Wrap Up

I hope you find this little project educational and useful. If you want to buy a field grade solar panel flood light for emergency or outdoor use, please click here.