7 DIY Pop Can Solar Heaters

in Home Energy

Cansolair commercial product There are hundreds of different DIY passive solar air collector plans floating around, but I’m focusing on a few that incorporate recycled aluminum pop, beer or juice cans as the "solar absorber".

These DIY pop can solar panels are inspired by Cansolair – a commercially-produced product invented by a man from Newfoundland, Canada.

The Cansolair  panels are well-engineered, and use materials with the most efficient thermal performance – as the hefty ($2749.00) price would suggest.

 

What’s Passive Solar Heating?

Passive solar air heating is considered the most cost-effective renewable energy – utilizing the energy from the sun by capturing it with an absorbing medium. There are plenty of online sites dedicated to passive solar applications, but you can get the basics via Wikipedia.

Passive solar heating intrigues me. It’s the only "free" heating source that I can think of. If it worked at night, it would be perfect.

 

GregCa5 - Builditsolar Crowd Sourcing a Design

I intend to build one of these at some point and my research has turned up several designs and methods of construction – from very well executed to the afternoon "garage experiment".

After spending several hours sorting through many pages of Google results, I’ve narrowed it down to a selection of results that’s representative of the designs, methods and materials DIYers are experimenting with – from good to bad.

A couple of these show up repeatedly in just about any Google search related to pop or beer can heaters (the Red Garage Project for example). I’ve included what I feel are the best designs that merit a look and some interesting ideas that you could adapt for your own purposes.

I know mine will incorporate the best ideas taken from the designs highlighted below.

 

Here’s what’s out there

solarni_panel_13s - freeonplate 1. Solar Panel out of Aluminum Cans (by Malden P)

This design most closely resembles the commercial product sold by Cansolair. The site has very good pictures and step by step details to build a full-size passive solar heater.

Rating: Excellent Design. Definitely worth a look

 

2. Beer Can Solar Heater (by bornonazero)

This is a similar (and very well executed) design originally presented as a pictures-only You Tube video. There’s also an updated video with a bit of descriptive narration added.

Rating: Definitely worth a look.

 

3. Greg’s Pop-Can Solar Space Heating Collector (Greg West)

This design on "Build it Solar" is excellent. The PDF download is very detailed with good pictures. It features aluminum plenums in a box made of polyiso rigid insulation and has a flat face of Twinwall polycarbonate glazing. Lot’s of good ideas in this one.

Rating: Well worth the download (3MB PDF).

 

solarbox_1453_resized -hemmings 4. The Ubiquitous Red Garage Project (Hemmings Blog)

This version pops up in a lot of searches which is really frustrating because it’s not a good design and it probably turns more people off the idea than it inspires. I have no idea why so many sites linked to it or posted about it.

The design has efficiency deficiencies like no plenums – meaning the air doesn’t pass through the cans – which is kinda the point, and what produces most of the heat.

On the plus side, he built a second, larger version and I have to give him props for recycling a patio door for the glazing.

Rating: Take a pass or give it a quick scan and move on.

 

5. Colorado Wind Power

This one is a bit crude in the approach, but it would be fast and easy to do. However, I’m not so keen on the idea of superheating Styrofoam and pumping the resulting off gasses into my home.

solarhotairburn - colorado wind powerThe best takeaway from this one is two unique methods to make the holes in the can bottoms:

• using a blow torch (which would be pretty much instant)

• using a belt sander, which takes out the full bottom cleanly.

If you needed to MacGyver one of these in an emergency, then this would get you there. If you’re going for a longer-term installation, keep looking.

Rating: Have a quick look just to say you did.

 

High heat paint - Brians solar 6. Brian’s Pop Can Solar Heater

This one is kind of in the middle of the pack – the functional design looks to be sound, but it loses points on the fit and finish.

If I’m going to invest the time and energy in building one of these, I want it to look good and be reasonably sure it will stand up to the extreme conditions it will be subjected to.

Brian does provide some performance data that shows what kind of results you could expect (in Alabama).

Rating: Look it over for ideas to use.

 

Moonshine solar - version 3 7. Moonshine Solar

These small-scale window units are a little different and I’m really drawn to them. The designer started with few randomly placed cans in a housing and has since revised the design twice, incorporating some of the conventions common to the more sophisticated designs.

I like the idea of having a portable "room heater" as opposed to – full-sized panel mounted on the side of the house for several reasons.

• Less cost to build
• No installation required
• Portability

My partner and I both work at home, but our offices are in different areas of the house – a couple of portable "space heaters" would be more likely to keep us comfortable than a single large one located in the only practical location, which is a long way from my office.

Rating: Definitely worth a look [Update: It seems the website for Moonshine Solar has been taken down since I was doing my research. Still, an idea that’s worth consideration.]

Wrap up

Passive solar heaters make sense and are an excellent DIY project that should pay for itself in a year or two. There are a lot of good ideas in examples above but the main points to consider carefully would be:

  • High internal Heat – use components that will stand up to repeated extreme temperature swings.
  • Insulation – avoid or cover Styrofoam insulation that could offgas or degrade due to UV exposure.
  • Location – maximum southern exposure during the warmest part of the day

The pop can heater is just one of many types of passive solar heating installations. I’ll explore other designs in the coming months.

 

Related posts on this site:

Comparing Solar Air Heater Designs & Performance
Solar Heat: Free for the Taking
Earthships: Sustainable & Self-Sufficient Living
Superinsulated House Design
Home Energy Retrofit Economics
Add Flexibility to Plastic Window Kits

My Related Posts on Buildipedia:

Passive Solar Strategies for the Home

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{ 10 comments… read them below or add one }

Lee

Very cool (or hot), let me know when you start building and I’ll come help!

Rick

Sounds good Lee. These things take a lot of cans so you help get the ball rolling by increasing your consumption of the canned beverage of your choice :-)

Rick

Monty Newhook BEd

The CanSolAir Heat Panel uses Lexan as its Glazing.
You could Blast it with a ShotGun and it wouldn’t Break.
This Panel is Rated as one of the Best in the World, by Mother Earth News (Autumn 2008).
The Panel Saves, on Average, the Equivalent of a Tank of Heating Oil per Season.
Get more info at cansolair.com
eMail: jim@cansolair.com
Phone: (709) 746 2077
Thanks.

Virginia

I like the idea of the smaller window heaters. My partner and I also work at home in opposite ends of the house, and both have south facing windows. We could keep ourselves pretty toasty with these. Unfortunately, neither of us drink soda anymore, lol We’d have to get some cans donated. I like the idea too of using PC fans and power supply, that keeps the costs way down for building it. Thanks for the article!

Rick

Thanks Monty. I imagine you have a lot of these installed in houses all across Newfoundland.

Rick

Rick

I still still haven’t gotten around to building one (or two) of these yet but I have salvaged a fan from an old PC and I’m working on my soda can collection.

Rick

Greg

Rick,

Just wanted to send a note and say thanks for featuring my pop-can solar heater. The reason I used the twin wall polycarbonate panel for glazing is that it insulates better than a single sheet of lexan. Also it’s almost indestructible.

Greg West
Georgia, U.S.A.

Dennis

Solar panels

Sandi

I want to do this, but I want to use cat food cans. I think they would be even more effective. With about 6 or more holes in the bottom of the cat food can and each one varied in position it would get even better ventilation. Plus they naturally lock together.

Rick

Sandi

I’d be leery of using cat food cans for a solar heater since it would be nearly impossible to completely clean the meat residue from the inside of the cans. Blowing hot air into your home through all those cans could be unhealthy.

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