Thermoelectric power for the yurt! I almost got it!

Hello, my faithful readers!

*I will be making a video post on this subject with all the details of this less-than-successful journey and will only outline my basic findings and conclusions in this post*

Now that 2016 is over, I celebrate 8 months of yurt living. I am still adjusting and tweaking different aspects, and today I will talk about my winter solution for electricity.

You might have seen my post about my heating setup. So you know I use a lot of energy to heat the place, and now I want to convert all this heat to electricity using Peltier elements and it’s seebeck or thermoelectric effect.  For those who don’t want to read the article, it’s basically a thermocouple that is used in portable fridges. If you apply electricity to it, one side will get very cold and another will be very hot. If you apply heat and cold to the element, you will get electricity. Simple enough, right?

Not that simple!

I was researching thermoelectric generators for some time and found no commercial products on the market. During my last trip to China, I found a factory who made me one. It’s a 45W woodstove generator that I will talk about here.img_20161213_135941My electricity

At this point I use around 40-75 watts at any given time for one ceiling fan (45W on medium), 10-20W for lights, and the occasional laptop and phone charging at 5-40W. Right now I power everything with 2 PowerIt Li-Ion solar generators that I charge offsite. One full charge lasts me one evening and night of the above consumption. So my goal it to create a solution that will charge those batteries from my heat sources.

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PowerIT solar generators

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My propane heater

First I tried to make my own little charger that actually works. But I am still waiting for parts from China, so I will update you on that in my future posts.

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My DIY cell phone charger based on 2 TEG1-199-1.4-0.5 40*40mm

So the way the generator works is you put it on a heat source and it will start making electricity. This electricity will turn on the cooling fans and the bigger the gap between the hot and cold side, the more it will produce.

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I managed to turn on several LED strips, but it’s not enough to charge my generators. I will need another 50-60 watts for that :-( If you want to see technical characteristics of this generator, you can do it here

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I managed to run my LED strips, each at 24W

Meanwhile, outside…

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After realizing that I won’t be able to charge my PowerIT generators, I decided to charge my marine battery and power my fan through an inverter, but it’s still in progress.

Ceiling fan

Conclusions:

My wood stove is not that good for this generator since it doesn’t have enough flat surfaces. It is also quite small and the temperature fluctuates quite a bit and this may overheat the generator. (Why? The temperature will gradually go down and the cooling fans would turn off. There will be no temperature difference to generate electricity. Even if you heat it again, the difference is not significant and fans don’t kick in and the cold side gradually overheats.)

Since this device is incredibly sensitive to temperature swings, I will be working on my own generator for my propane heaters, which have consistent temperatures and hopefully better results

I had quite good success with my DIY generator and managed to charge my phone with it.

Peltier elements are very inefficient, but still usable. It just needs tweaking for every scenario.

Bottom line:

I didn’t achieve battery charging  from my heat sources, but I will be working on custom solution during this winter.

Let me know if you have any questions.

Meanwhile, I post a lot of pictures and small updates on my Instagram and Facebook. Stay in touch.

Sao Bol

Kochevnik