The Beast Copenhagen Solar Cooker.




The Beast Copenhagen Grande - 2 Gallon (7.57L) Solar Cooker with 12" (30.48cm) square base. It can hold up to 12" (30.48cm) pans or 9 quart canning jars. I took a design I had invented several years ago and reimagined it as a large camp cooker. The smaller version can cook 3 frozen chicken breasts in 1.5 hours. The chicken is so tender and tasty. This larger version can cook far more food in the same time because of the larger solar collecting area. It's water capacity is 6 times more than the most common solar tube cooker and you could make 20 of these for the same price you would pay for a tube cooker. These are the instructions on how to build your own Beast Copenhagen Solar Cooker. It can pasteurize 2 gallons (7.57L) of water in 2 hours. It is made with 8 sheets of standard poster board, foil, glue and a wood base. It can also be used for heating water to wash dishes or clothes or have a warm sponge bath. If you are cold at night open it flat and put it under your sleeping bag. Lost? It makes a great signal device in the day time. Reflect lantern light with it. Open flat on ground for serving table at campsite.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Cut 8 Sheets of Poster Paper Into 22" (55.88cm) Squares.

Poster paper is sold in 22" x 28" (55.88cm x 71cm) size sheets.

Cut 8 sheets of poster paper into 22" (55.88cm) squares.

Step 2: Glue 2 Sheets of 22" (55.88cm) Square Together, 8 Sheets Will Become 4 Sheets.

Spread glue evenly on one sheet and lay a second sheet on top of the glued sheet.

Do this 4 times to make the 4 panels or petals for the solar cooker.

Step 3: Proceed to Next Step or Stop and Decorate Each Panel.

Decorating the panels is just a matter of choice. I chose to use sponges and craft paint to make a random pattern on the petals/panels. When the paints dried I sealed it with Mod Podge.

Step 4: When All 4 Panels Are Dry Add the Reflective Material to Only 1 Side of Each Panel.

In this picture I have used a self-stick mirror vinyl but the shiny side of foil and some reflective gift wrap can be used. I have even used reflectix or foil tape if I cant find the other materials. They all work if shiny enough.

Step 5: Use 1/8th" Plywood, Cut Two 12" Squares. Drill Holes. Thread Together. Crease Edge.

Cut two 12" (30.48cm) squares of 1/8th" (.342cm) Birch plywood.

Draw an X from corner to corner. Starting 1/4" (.635cm) from corners drill first hole then another 2" (50cm) nearer the center until you reach the center.

Find a large area to lay out the panels flat with the corners touching.

Put the wood base pieces together and begin to lace them together. Thread the first lace under the 2 boards and up through the corner holes, make sure you have the same length on each side, then through the holes leading to the center. Do the same for the holes on the opposite side. Pull the 4 ends of the laces through the center (enlarge the hole a little if they don't all fit through) Then slip each corner of each panel in between the wood base pieces. Hold in place and punch a hole through the corner of each panel at the point drilled 2" (50cm) from center hole. Pull laces down under base through that hole. Tie laces together and your Copenhagen Grande Solar Cooker is done.

Step 6: Fold a Crease on Each Panel Where It Meets the Base.

Once the panels are secured to the base with the shoelace, take each panel, one at a time, and fold a crease at the edge of the base piece.

When all 4 panels are creased then curve the panels into an open cone shape and clip panels together where they meet. If the panels are a little heavy use a small bungee cord to hold them together.

Step 7: To Cook With the "Beast" Copenhagen Solar Cooker Focus Sun on Center Base or Pot.

To cook with the "Beast" Copenhagen Solar Cooker you must adjust the panels with the clips to get the maximum amount of sun on the center base piece or pan you are using to cook with.

The reflected focus is so good in this picture that the wood appears to be made of reflector material but it is plain wood.

Step 8: The "Beast" Copenhagen Solar Cooker / Water Pasteurizer

With this" Beast" Copenhagen Solar Cooker you can cook for a large group and pasteurize a lot of water. The base measures 12" (30.48cm) and will hold large cooking pots. The cost to make it is low. If made with foil it should cost about $8 to make.

The materials list is:

8 Sheets of 22" x 28" (55.88cm x 71cm) poster paper

2 pieces of Birch plywood 12" x 12" (30.48 x 30.48)

2 glue bottles

4 bulldog binder clips

2 shoelaces 36" (91cm)

aluminum foil or self-stick reflective Mylar.

Survival Ready Contest

Participated in the
Survival Ready Contest

Live off the Land Contest

Participated in the
Live off the Land Contest

Solar Contest 2016

Participated in the
Solar Contest 2016

Be the First to Share


    • Made with Math Contest

      Made with Math Contest
    • Multi-Discipline Contest

      Multi-Discipline Contest
    • Skateboard Contest

      Skateboard Contest

    8 Discussions

    sclaussonRead Young

    Answer 5 months ago

    Yes when I build the smaller Copenhagen or (Purple Fig as the instructable is called) I use a .03 sheet of poly propylene. The larger panels used in the Beast need a little support like a dowel in the center to keep rigid enough to cook well. However the paper version stays rigid on its own.


    2 years ago

    This would make a great science fair project.


    3 years ago

    Another amazing Copenhagen solar oven.

    They are all marvelous!!!

    Alberta Aquaponics

    3 years ago

    Bought one, made one and use them pretty regularly while I am solar cooking. Even use them as a reflector for solar tubes.

    These things are absolutely awesome for camping and hiking cooking use.

    Sharon is awesome and this is a much build and use!
    Thank you Sharon!

    1 reply
    sclaussonAlberta Aquaponics

    Reply 3 years ago

    Thank you Alberta Auquaponics. I am going to try using the Rand vacuum solar tube in the Grande. I am glad to hear the regular Copenhagen Solar Cooker makes a good reflector for solar tubes.


    3 years ago

    If you make one please share it. I will do more testing for how large a pot and how much food could be cooked in it at one time. I have an 18 cup aluminum coffeepot and 2.5 gallon 19.5L aluminum 5 stacking pan set. I will paint them black and then test how much capacity and what heat they reach.


    3 years ago

    Very cool! I could definitely do this.