How to build a solar powered biochar oven
Version 1.3
Here’s an open-access graphical manual that describes how to build a biochar oven that’s heated using direct DC electricity from solar panels.
Three of these units have been built so far, and we’ve incorporated improvements with each successive build. Hence, “Version 1.3.”
I’m still working on the emissions control system. Once I’m happy with that I will add it to this document as an Appendix and notify readers of this and any future updates and improvements.
Give it a try and let us know your feedback!
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I've been thinking of this idea for a while and I'm glad someone got around to actually designing and building it. No reason to build a fire to get biochar when we have power sources that can do it without using all that valuable wood that could instead be biochar. This way even prevents you from using grid power so you can be out in the woods and create your biochar on site!!
Thanks for sharing!!
Josh, thanks so much for sharing this CC, you’re a legend.
Ok I’m really excited by this since the original kiln with the open flame really means the drums need replacing after about 5 years, and they’re a bit ridiculously priced here. I’ve been putting off my yearly batch of biochar (used for our composts/soil building) because my drums got so many holes now and very rusted.
I’m going to see if I can source the parts here but firstly I’m curious if you measured the power/current whilst the element was on? I’m gonna have to adapt this to our solar’s 220VAC.
Also, how do you know when the charcoal is done? How long does it generally take on a day of your good sun?
I’m thinking I might set up the chimney with a bend in order to collect wood vinegar (great for organic gardeners here).
Cheers!