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.

Jeunkong Tai

Recent college graduate from the University of Kansas with an electrical engineering degree and bilingual in Chinese and English. I've learned about solar panels just by being around friends that have them on their home rooftop, and have gained knowledge by helping out on some DIY projects.

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