Evacuated tube cooker

Spent some more time this weekend playing with the evacuated tubes. I used some things that were laying around to make a solar kettle.

Tilted toward the morning sun

I used an old tool handle, maybe it was a broom. Two bucket handles bent to hold the tube and hold the reflector at an angle. The reflector is some extra coraplast and mylar cutoffs. I wanted to be able to change out the evacuated tubes giving them time to cool down before boiling more water.

The first peak was when I removed water for tea. Didn’t want to wait was about 70°C. Second peak 125°C

Solar Cooking in the Kawartha’s

In on going efforts to bring Solar cooking to others I’ll be cooking up breakfast Saturday morning in the Kawartha lakes area.

I do realize hiding out in the woods solar cooking for myself doesn’t get it out there. I’ll be spending less time experimenting this summer and more time cooking for others.

This will be a test run to see how long it takes to get the big parabolic solar cooker apart and set back up. I won’t completely disassemble the big sucker, going to halve the reflector and take off the tripod & pot stand.  Here’s hoping everything will fit in the car!

From my last Demonstration setup took about 30min to get ready. That was four cookers and some extra items for display plus food. Next time I will keep some cookers out of the sun for display purposes. I let’s those who are curious get a better look.

Lunch with guests

I was fortunate to have some guests for lunch new to solar cooking. We had scrambled eggs, hummus and beer bread. I used a different solar cooker to prepare each item demonstrating the differences and how to use them.

Parabolic cooker boiling eggs and box cooker baking bread
Panel cooker & jar to pressure cook beans
Panel cooker
Beer bread
This picture was taken too late in the meal


Would you buy a solar cooker that gave one away?

My goal is to make and sell solar panel cookers and each one sold would give one to a community in Africa that I’ve visited previously. Funds from the Kickstarter would also pay for my travel to Africa from Canada for community training & distribution.

Stretch goal ideas? Extra cooking vessels and accessories. Random 5 purchasers within Greater Toronto or Southern Ontario would have their cooker delivered with training & a suitable meal, solar cooked of course. Build a Solar Bakery for my Hosts in Eswatini, see the GoSol built Fire Solar Concentrator below. Huge stretch goal of training a community member to produce and train other communities in Eswatini after the initial distribution. This would help with follow up after the rainy season to help encourage new behaviour patterns when cooking and help to ensure best practices.

So what do you think?

It’s -17°C! Eggs Please?

Beautiful sunny day out this past Saturday. I was able to cook in my new evacuated tube solar cooker. I do not have a proper tray to cook in and used aluminium foil. It was not ideal and I lost two eggs. The result 3 eggs cooked to 74°C in 40 minutes. In ambient temperature of -17°C that’s good!

I had to find a relatively flat spot to put the cooker. Not an ideal spot with some light tree cover. The most difficult part is cleaning the eggs off the inside of the glass tube.

It’s time to sort out the tray to cook in. Stay in touch I plan to make chicken wings next!

What is your favourite type of chicken wings?

I prefer a hot n’ honey, jerk, or honey garlic dipped in hot sauce.

Initial testing evacuated tube cooker

When the cooker was complete the sun had set. I had also not build a tray in which to cook yet. To test the cooker a BBQ thermometer and 40 watt incandescent bulb was used.

Start @ 5:20

At the start oft he test the internal temperature was 21° Celsius and the room temperature was 19° Celsius.

Finish @ 5:59

After 40 minutes the internal temperature was 77° Celsius and the room temperature was still 19° Celsius.

The input from the sun for the area of the solar cooker should be about 250 watts as my average solar gain is 1000 watts per meter squared. Knowing this it should reliably cook food within 20 to 30 minutes.

Tube Solar Cooker

I had always wanted to buy one of these cookers. I’ve been watching others posts online, seeing how they are cooking with them and reading up on some design details. I was unable to justify buying one but I could justify buying ten thermal solar tubes!

I used an old article from GoSun that had promoted a DIY kit version. This was no longer available so I found some tubes online. Striking out on my attempt to find a larger tube I picked up these smaller ones and had designed the cooker to hold two tubes.

I wanted to make two cookers. So the ends were clamped together two holes drill through and two bolts were used to hold the pieces together while drilling and cutting.

I made some changes that have the base of the cooker angled at 45 & 30 degrees to the horizon. There is also enough material for the cooker to sit at 90 degrees. To use this configuration to boil water we would have to prop up one end. There are other versions of this type of cooker that would be better to boil water. I will use this for now and most likely build another one later.