Loyally Serving our Customers Since 1994

Save on shipping!

$7.95 Flat-rate shipping on most orders.

My Cart

You have no items in your shopping cart.

  • sale
Home / Science projects / Build a Solar Oven
  • Build a Solar Oven

    Build a Solar Oven

    You can use the sun's energy to heat up a tasty treat with this simple solar oven! (Get an adult to help you with the cutting.)

    Pin It

    Check out our Solar & Alternative Energy Kits

    What You Need:

    • Cardboard pizza box (the kind delivered pizza comes in)
    • Box knife or scissors
    • Aluminum foil
    • Clear tape
    • Plastic wrap (a heavy-duty or freezer zip lock bag will also work)
    • Black construction paper
    • Newspapers
    • Ruler, or wooden spoon

    Download our Solar Oven Recipes to get ideas for what to make with your solar oven.

    What You Do:

    1. Use a box knife or sharp scissors to cut a flap in the lid of the pizza box. Cut along three sides, leaving about an inch between the sides of the flap and the edges of the lid. Fold this flap out so that it stands up when the box lid is closed.
    2. Cover the inner side of the flap with aluminum foil so that it will reflect rays from the sun. To do this, tightly wrap foil around the flap, then tape it to the back, or outer side of the flap.
    3. Use clear plastic wrap to create an airtight window for sunlight to enter into the box. Do this by opening the box and taping a double layer of plastic wrap over the opening you made when you cut the flap in the lid. Leave about an inch of plastic overlap around the sides and tape each side down securely, sealing out air. If you use a plastic bag, cut out a square big enough to cover the opening, and tape one layer over the opening.
    4. Line the bottom of the box with black construction paper - black absorbs heat. The black surface is where your food will be set to cook.
    5. To insulate your oven so it holds in more heat, roll up sheets of newspaper and place them on the bottom of the box. Tape them down so that they form a border around the cooking area. The newspaper rolls should make it so that the lid can still close, but there is a seal inside of the box, so air cannot escape.
    6. The best hours to set up your solar oven are when the sun is high overhead - from 11 am to 3 pm. Take it outside to a sunny spot and adjust the flap until the most sunlight possible is reflecting off the aluminum foil and onto the plastic-covered window. Use a ruler to prop the flap at the right angle. You may want to angle the entire box by using a rolled up towel.
    7. You can make toast by buttering a slice of bread, or sprinkling cheese on it, then letting the sun do the rest. Cooking a hot dog or making nachos with chips and cheese are also fun treats to make in your solar oven! It would also work great to heat up leftovers. So the paper at the bottom doesn't get dirty, put what you would like to cook on a clear plastic or glass plate. A pie plate would work well.
    8. To take food out of the oven, open up the lid of the pizza box, and using oven mitts or potholders, lift the glass dish out of the oven.

    What Happened:

    The heat from the sun is trapped inside of your pizza box solar oven, and it starts getting very hot. Ovens like this one are called collector boxes, because they collect the sunlight inside. As it sits out in the sun, your oven eventually heats up enough to melt cheese, or cook a hot dog! How does it happen? Rays of light are coming to the earth at an angle. The foil reflects the ray, and bounces it directly into the opening of the box. Once it has gone through the plastic wrap, it heats up the air that is trapped inside. The black paper absorbs the heat at the bottom of the oven, and the newspaper make sure that the heat stays where it is, instead of escaping out the sides of the oven.

    Your solar oven will reach about 200° F on a sunny day, and will take longer to heat things than a conventional oven. Although this method will take longer, it is very easy to use, and it is safe to leave alone while the energy from the sun cooks your food. If you do not want to wait long to have a solar-cooked dish, try heating up something that has already been cooked, like leftovers, or a can of soup. Putting solid food in a glass dish and liquids in a heavy plastic zip lock bag works well. You can also pre-heat your oven by setting it in direct sun for up to an hour.

    Other recipes you may want to try are making baked potatoes, rice with vegetables, chocolate fondue, s'mores, and roasted apples with cinnamon and sugar. Even on partly cloudy days there may be enough heat and light from the sun to slow cook a special dish. Here are a few tips for having success with your solar oven:

    • Stir liquids (if you're cooking something like fondue, rice, or soup) every 10 minutes. You can rotate solid food every 10-15 minutes as well, so it cooks evenly.
    • Reposition your solar oven when needed, so that it faces direct sunlight. You should be checking periodically on your oven, to make sure it is in the sun.
    • Make sure that the foil-covered flap is reflecting light into the pizza box, through the plastic-covered window.

    For more ready-to-go science projects, see Solar & Alternative Energy Kits.

« Previous Article: Electricity Experiments

Next Article: Make a Kaleidoscope »

« Previous Article: Storms

Next Article: Ocean Animals Worksheet »

Comments




By: Bobby
Date: Oct 21, 2014

Cool!


By: Zane Smith
Date: Oct 21, 2014

My class is collaborating with students in Japan to complete a project like this! This is so much fun and I suggest that others try it out!


By: Elizabeth
Date: Oct 20, 2014

solar is awesome


By: Brice
Date: Oct 15, 2014

Thank you sooooo much for this helpful website! In my 5th grade class this year, for extra credit, we had to build a solar oven! I needed the extra points but, I had no idea where I was going to begin with to build a SOLAR OVEN! I searched up on the internet how to make a solar oven and this website was the first to pull up! I clicked on it to try it out and this website was phenomenal! Right now I am testing it out by toasting bread. (Again, your advice on your website told me to do that) My solar oven looks so good, thanks to you!
I can’t tell you enough….. THANK YOU!!!!!  :o)


By: alexia and savannah
Date: Oct 13, 2014

this was a very fun project that we enjoyed, this website has helped us a lot with our science fair project,    thank you so much !!!!


By: alexia and savanna
Date: Oct 06, 2014

we really enjoy this help for our project thx !


By: marcella ybarra
Date: Oct 03, 2014

Wow sounds like a really cool project. I just might do it .


By: bob
Date: Oct 01, 2014

so cool


By: Tati
Date: Sep 28, 2014

Thanks! I got a B+


By: Gabriel Watts
Date: Sep 22, 2014

this was great advise thankz.