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News:
"Open Source Ecologie France" successfully completed a crowd-funding to buy the materials for a second improved prototype, including 4 modules like the one described in this instructable!
If you feel like contributing in any way to the project, be sure we will be very happy to welcome you!
Thank you so much!

MAKER CONTACTS

Andrea Sannnuto, Hugo Frederich, Cyril Libert, François Veynandt, Philippe Gattegno on www.opensourceecologie.org

SHORT DESCRIPTION

This document describes the construction of a linear Fresnel solar concentrator. The prototype is adapted for heat needs between 100°C and 250°C.

UNDERSTANDING

Current levels of energy consumption are generally unsustainable. The use of solar energy favors a better distribution of the territorial economic activity. Meanwhile, many actual models are either designed for the industry, either for cooking in the South countries. Open Source Ecologie France researches and develops a solar concentrator made for an intermediary market, in order to make possible for little producers, artisans and micro-industries the use of solar energy. The prototype is designed for artisanal common uses : collective cooking, local food production, extraction of essential oils, jam cooking, jar sterilization, water purification, wood treatment, alimentation steam, other process using the vapor under 250°C. Vapor at lower temperatures can be produced in the prototype, the possible applications are heating the current water, product drying…

We propose a module capable of producing maximum 1 kW. The entire system will combine a specific number of modules in order to produce between 5 and 50 kW. The system must be equipped with the right components and automation, it has to fit the professional activities of the users; for example, it can be the main or the complimentary power energy. Its price has to be low enough in order to be easily adopted and shared.

GENERAL INFORMATION

SKILLS NEEDED

  • Metal work / Welding
  • Carpenter
  • Laser cutting
  • Plumbing
  • Electronics
  • Can help: basic knowledge in geometry, optics and material properties (related to a solar concentrator)

REQUIREMENTS

Some tasks need to be done with 3 persons, like assembling the structure.

A solar concentrator uses the sun’s light and it is useful in the regions with high solar radiation. A profitability calculation is useful.

Some methods are very specific to the project, but as well, there are commonly used methods (laser cutting; welding; metal cutting, drilling…)

Complementary to this manual, you can find online more information on:

  • Software, Electronics, Modelling (once finalized), documentation, licence details: see Github
  • discussions on our Forum
  • the documentation and collaborative writing in French is happening on our Wiki
  • technical requirements giving a comparison between the present demonstrator and the next prototype
  • the project in French:
  • you can subscribe to our newsletter and more on our website: www.osefrance.fr :)

COST

About 2000€ of material.

FABRICATION TIME

About 150h. 7 days 3 persons (or 4 persons during a week)

LEVEL OF TECHNICAL DIFFICULTY

Needs in terms of skills, intermediary to expert level:

  • An intermediary know-how to work the metal for the construction of the structure;
  • An intermediary know-how to install the electronics;
  • An intermediary to expert know-how to build the hydraulic circuit, depending on the pressure and temperature level of the usage.

MATERIAL AND TOOLS

INPUT

Steel

  • Tube 40x30 thickness:2 L1430 minimum length 1430 quantity:4 (Order : 1,5 x 6m)
  • Tube 25x25 thickness:2 L2130 minimum length: 2130 quantity:4 (Order : 2x6m)
  • Tube 30x30 thickness: 2 L2500 minimum length: 2500 quantity: 5 (Order: 2 x 6m)
  • Tube 20x20 thickness: 2 L2200 quantity: 4 + L1000 quantity 2. minimum length: 2200 (Order: 2.5 x 6m)
  • Tube_50x50 ép.3 L3m minimum length: 3m quantity: 2 (Order : 1x6m)
  • Jonc acier Ø8 quantity: 6M minimum length: 150mm (Order : 1x6m)
  • Flat (15 to 20) x (2 to 2,5) L2,5m minimum length: 2,5m quantity: 2 (Order: 20,58x2,5 L6m)
  • Flat (7 to 10) x (1 to 2) L2,5m minimum length: 2,5m quantity: 1
  • Flat 20x3, L100mm quantity 2
  • Flat 30x5, L2150mm quantity 1
  • Profile. interior dimension : (20 à 35) x (30 à 50) L 2,2m quantity: 2; L 100, quantity 2. minimum length: 2,2m (Order: dim int 27 x 55,5 thickness: 3. dim ext 30 x 58,5)
  • Stainless steel bar 8000 mm long, 8mm diameter

Aluminium

  • Square tube 2000m long, 20x40.
  • 2000x 3000 (2000x2000 + 3 times 340 x 680 mm + 2 times 230 x 125mm + 2 times 50 x 50 mm) Mirror plate, anodized aluminum
  • 0.2 mm thick Plate (printing offset plate) 700mm x 2100mm + 300x250mm

Screws

  • Screw M10 L80. Quantity: 2
  • Screw M8 L100. Quantity: 12
  • Screw M6 L70. Quantity: 32
  • Screw M6 L60. Quantity: 40
  • Screw M6 L70 quantity: 40
  • Screw M6 L25. Quantity: 20
  • Screws M5. Quantity :12
  • Screw CHC (pan hex head) M4 L20 quantity: 50
  • Screw M4 countersunk hex head. Minimum length: 10 quantity: 20
  • Screw M3x16. Quantity : 80
  • nut M8. Quantity : 42
  • nut M6. Quantity :200
  • nut M5. Quantity :12
  • nut M4 quantity : 150. (60 in screws H M4 (thickness 3) + 50 in countersunk head screws M4 (thickness 3)
  • Washers M3 quantity : 300. Ø9-Ø3,2-thickness:0.7
  • Washers M4 quantity: 120. Ø12-Ø4,4-thickness:1
  • Washers M6 quantity : 250. Øext 13.8 et 18
  • threaded rod M8 quantity: 1000mm. minimum length: 400mm

Wood

  • Wood plate (for example laminated structural wood), minimum dimension: 810x500 (thickness:.10) compatible with laser cut. Quantity: 2

Pipes

  • 1 brass tube with an exterior diameter of 55 mm and a length of 1900 mm
  • 4.5 m copper pipes, minimum length 3m.

Other

  • Anti-rost painting
  • sealant PVC alu special for glazing
  • Height adjustable feet M8. Threading M8 L25 – total height 35mm quantity: 8
  • Glass cover 1000x250x4 quantity:2
  • 2000 mm length of a 2 mm diameter steel cable
  • “element to adjust length of the cable” 1
  • Glue
  • Rockwool (or other fire resistant insulation material, 300°C) insulation 10 cm thick (600x1000) quantity 2.
  • Cotton Insulation (for steam pipe) 10 cm thick, 600x1000, quantity 1.
  • Aluminum adhesive tape (quote in text)
  • Adhesive tape
  • Auto-lubrifying bushing. Quantity: 40

TOOLS

Regular metal and wood workshop tools, including:

  • Hack saw
  • Grinder
  • Drilling machine and set of drills for metal: 3mm, 4mm, 5mm, 6m, 8mm, 10mm, 20mm. Drills for wood: 4mm, 10mm.
  • Bristol paper
  • Cutter
  • Measuring devices : over 3 meters tape measure, 1 m ruler, square and metallic protractor
  • 3 clamps
  • Plunging saw

Plus:

  • laser cutter/printer

OUTPUT

The CONCENTRATOR:

  • mirror field
  • receiver
  • tracking system
  • demonstration…

+ WASTE: unused mirrors, metal pieces, unused pieces of wood, glue, sealant

PARTS OF THE DOCUMENTATION

1. Mirror field

1.1. Support structure (1day)

1.2. Mirror facets (1day)

2. Receiver

2.1 Support structure (1day)

2.2 Skeleton of the receiver (1day)

2.3 CPC Reflector

2.4 Absorber tube

2.5 Assembling of the receiver (3h)

3. Tracking system (2 days)

4. Usage demonstration

Step 1: (1.1) Cutting the square tubes

1–MIRROR FIELD (Time needed: 2 days) > 1.1 Support (Time needed: 1 day)
Note:
The support is made of two frames: repeat or double the steps 1 to 6, afterwards finish the assembling with the step 7.

Material

  • 2 main square tubes 25x25 mm
  • 2 square tubes for the support 30x40 mm (the mirrors are fixed on it)

Tools

  • Hack saw
  • Grinder

How to?

Use the grinder to cut at the length of 2130 mm the two main squared tubes and at the length of 1430 mm the 2 square tubes for the support.

<p>Its an wonderfull idee and it brought me also to an idee for areas with less sun like here in Germany. The same system can be done with air. This way the whole system is less expensive.<br>If we do not use the motors and direct all mirrors to the reflector high up and direct the whole to souht then we have no trouble with frozen pipes in winter.<br><br>The hot air we cns lead through 6 aluminum Watercoolers from Opel corsa as they are the most cheep ones. These Coolers we place in an 2 m by 0,7 by 0,6 m inside measured Hot air water cooler. This cooler is made of stone and outside isolated with 20 cm Isolation. The upper side is made of an strong waterproof material also covered with 20 cm good material. The 6 watercoolers can then be connected with our heating and warm water supply.<br><br>This system extended to 3 m&sup3; air water cooler can heat my entire House as my house needs only 5000 Kwh</p><p>Jarinus Prins Germany</p>
A brilliant idea, but the design is overly complex.<br>CNC laser or plasma cut parts could be used to sell a kit that would slot this together far more easily and at least as accurately. And would likely cost less than the masses of tube required here. <br>Hopefully the community will adapt this and refine it to reduce the tool and part counts.
<p>Any effort into going back to steam powered machinery? Such as for small factories i.e. the kind in developing nations. I know Ethiopia is damming a river right now for hydro-electric to power it's cheap manufacturing based economy. And the last thing that part of Africa needs is anyone messing with it's few rivers. Not to mention the land grabbing from small farmers to grow grain crops for export &amp; send more people to city slums to work in the factories.... </p>
<p>Hi, there are betterways indeed !!</p><p>the solar concentrator is a tool to capture the thermal energy from the sun and transport it using the steam.</p><p>once it is captured in steam power the applications can be numerous for a farmer or small factory.</p><p>most of the applications tools should be reinvented to have a local source of energy through steam or scaled down and open sourced for a small scale production. </p><p>Best ROI of the solar concentrator comes when multiple applications share the same solar concentrator (even though there will be -mainly- 1 application using it at any single time).</p><p>in our priority list there are :</p><p style="margin-left: 20.0px;">Still : allowing the production of essential oils or ethanol for biofuels or pure water (ie for residual-free soaps)</p><p style="margin-left: 20.0px;">Sterilizer: to allow sterilizing and reusal of glass containers </p><p style="margin-left: 20.0px;">Pasterizer: to pasteurize fruit juice and increase their longevity</p><p style="margin-left: 20.0px;">Storage: to allow use of steam also inadvers weather condition (for some hours ie 24hrs)</p><p style="margin-left: 20.0px;">These were selected by a group of farmers for their usage on their bio farms.</p><p>the main applications are:</p><br>1- Mid-High temperature processing<br><p> a. Food processing(cooking <br>[Bread, Meals], Pre-cooked food production, Tomato sauces, Marmelades, <br>Cans, Soups, Sterilization and container reuse)<br> b. Materials <br>transformation &amp; Chemistry (Soap, essential oils, Vegetable fuels,<br> Algues, Bio-materials, Dryers[ie. wood]) <br> c. Pre-heating for other specific applications (Gazifier, Metallurgy, Ceramics, Glass, Hoven, Gas separation, Material purification, ...)<br> 2- Heating (&lt;100&deg; as waste product)<br> 3- Electricity (Thermoelectric generators [seebeck], Stirling, [from mechanical and generators] )<br> 4- Cooling (Absorbtion with Zeolithes, Heat Pumps,cool storage)<br><br> 5- Mechanical processing [Crunching, Smashing, RPMs ] (wood works, <br>Pellets, Fibers, Bio-materials, Isolating material, Pneumatic &amp; <br>Hydraulics)</p><p>for more discussions on the topic:</p><p><a href="http://forum.osefrance.org/viewtopic.php?f=39&t=2906&p=2996&hilit=hoven#p2996">http://forum.osefrance.org/viewtopic.php?f=39&amp;t=29...</a></p><p>new functional requirement is being discussed here:</p><p><a href="http://forum.osefrance.org/viewtopic.php?f=2&t=3019&p=3365#p3365">http://forum.osefrance.org/viewtopic.php?f=2&amp;t=301...</a></p>
<p>Textile industry would also be good. Any operation that involves conveyor belts &amp; sorting machines. Maybe lumber/carpentry. There was a maker of treadle powered lathes &amp; other carpentry machinery named Barnes. They were the first to re-imagine the old hand saws &amp; planes. http://finetools.com/pages/w-f-john-barnes-company-woodworking-machinery. I guess what's needed is belt driven machinery. There are probably many makers still out there. </p>
<p>the point is: get the world citizens to collaborate with us on developing new applications. share those links and our contact information osefrance at gmail dot com so we can get organized to develop the technology we need for a distributed and effective production, planned to last; breaking the chains of dependency to strong international actors... </p><p>as reminder this project is part of a bigger program to develop products for a sustainable autonomous production. this is called the Global Village Construction Set and was presented by OSE in US in 2011.</p><p>tell us more and get in contact!!</p><br><p>Andrea</p>
<p>Does this device produce enough heat to drive <strong>Einstein refrigerator</strong> an <a href="https://en.wikipedia.org/wiki/Einstein_refrigerator" rel="nofollow">https://en.wikipedia.org/wiki/Einstein_refrigerator</a> ?</p>
<p>hi farticus, this requires further study, the solar concentrator 1:1 will deliver 5kW of power but with the intermittent source of the direct sun light. </p><p>refrigeration is indeed a very important topic and opportunity for the solar concentrator, </p><p>Cold is an opportunity on 2 main aspects: </p><p>1- Ice has high properties to keep energy over time.</p><p>2- cooling is more needed the more sun there is, so being able to convert heat from the solar concentrator to cooling is a high added value application of interest to people.</p><p>point 1, ice making, we tested it with a DYI ice maker based on a<strong>d</strong>sorption principle (with Zeolite) with our friend Jean Boubour <a href="http://www.soleil-vapeur.org"> www.soleil-vapeur.org</a></p><p>and we produced in Marbella, Spain about 4KG of ice (the zeolite was dried previously using Jean's solar concentrator) the ice maker is also open source and available in 4 languages on his website.</p>
<p>Hi All;</p><p>Yes only a single drive motor is required.</p><p>See some more info and a spreadsheet on &quot;Linear Fresnel Reflectors&quot;:</p><p><a href="http://www.redrok.com/main.htm#lfr" rel="nofollow">http://www.redrok.com/main.htm#lfr</a></p><p><a href="http://www.redrok.com/main.htm#lfrcalcs" rel="nofollow">http://www.redrok.com/main.htm#lfrcalcs</a></p><p>redrok</p>
<p>Thanks for sharing your work on the subject.</p>
<p>Hello Redrok,</p><p>thanks for your comment and for posting the instructable on your website.</p><p>I must admit that we had researched also through your website redrok.com and found your work very useful and source of inspiration to develop the Solar-OSE heliostat system.</p><p>Andrea</p>
<p>Hi Andrea of Solar-OSE;<br>Thank you for the kind words!<br>I know you are using &quot;Computational&quot; solar tracking that is used to drive your stepper motors.<br>However, I wanted to point out that a sensor based &quot;Analog&quot; solar tracker can be used, as an alternative, which would drive permanent magnet DC motors. Since the LFR is technically a &quot;Heliostat&quot; a mechanical bisector mechanism is required. See the pair of gears I used on a &quot;Receiver Axis Heliostat&quot; design I have made:<br>http://www.redrok.com/heliolighting.htm#recaxgear1<br>The pair of small gears precisely bisects the angle between the sun and the receiver. Better yet, the sensor in the LFR always aims directly at a N/S line through the sun.<br>I also show a few other bisector mechanisms on that page.<br>BTW, very small motors can be used to move even heavy mirrors if the final drive has a lot of reduction. I usually recommend a total reduction of 100,000/1. Or, a speed slow enough to take about 1/2 an hour to rotate from east to west, this is still 24 times faster than the sun.<br>Also, the axes of the mirror slats and receiver axis are not required to be parallel. What is required is all the axes must converge at a single point. Even as close as the end of the receiver.<br>redrok</p>
<p>on the tracking system used:</p><p>it was a solution chosen to allow an automatic calibration in whichever geographic location we would install the system and in whatever configuration.</p><p>De facto, while this project can be replicated as is, this is a prove of concept that allows us in our no-profit association OSE-France to perform further study and optimize the next solar concentrator 4 times bigger (goal is to have a module producing 5KW peak thermal power).</p><p>among the test that we are going to perform are changes of the elevation of the focal axis and change of the axis orientation (est /west in stead of north/south) and document the findings based on the latitude at which we will test it and the meteo conditions. </p><p>furthermore, this system is used as demonstrator and can be easily transported from event to event over a station-wagon car (therefore preferably must work in different geographic location out of the box).</p><p>for these reasons we postponed the mechanical challenge to use a single bigger engine to drive the movement of 20 blades to the next prototype (that will have a fix installation) and preferred to use for this demonstrator the solution of 20 smaller stepper motors.</p><p>I would like also to highlight that a full no-electronic solution for tracking is available open source, made by our friend Daniel Connell who was also present at POC21 with his project of wind turbine. </p><p>His solar tracking system can be found on <a href="http://www.solarflower.org/tutorial.php?lang=en&tut=box#.VlxiGnpLu1E"> http://www.solarflower.org/tutorial.php?lang=en&amp;t...</a></p><p></p><p>For information: </p><p>We are organizing to design and build the next prototype Alpha to get up to 5KW of thermal power and aim to have it complete by summer 2016. if you are interested into participating on the design or the workshop get in contact with us through the website <a href="http://www.opensourceecologie.org"> www.opensourceecologie.org </a> </p>
<p>A question...the brass receiver tube that you use in this design (step 27, 2.4) seems to be blackened or tarnished in some way. Is this deliberate, to increase the thermal absorbency of the tube, and if so how did you do it? </p>
<p>Yes, the brass pipe is normally shiny. It has been oxydized using a special solution designed to alter the surface of the pipe. The product can easily be found on the market.</p>
<p>Thank you. I had wondered as there is a mention in the Gaviotas book of how they had also blackened the copper pipes in their solar collectors with a homemade solution to improve thermal absorption. Unfortunately, the book does not go into details as to how they did this. </p><p>There are &quot;antiquing&quot; solution on the market one can use to blacken bronze and copper, but there are some &quot;old school&quot; ways of doing it too, if you can come up with the ingredients.</p><p><a href="http://chestofbooks.com/reference/Henley-s-20th-Century-Formulas-Recipes-Processes-Vol1/Black-Color-on-Brass.html#.Vj3rmX7hDIU">http://chestofbooks.com/reference/Henley-s-20th-Ce...</a></p><p>It sounds a bit unsafe. :)</p>
<p>Thank you for the link. The recipe described in Henley's book is more advanced than what we did. We just &quot;painted&quot; the pipe with the solution, let it dry, rinse with a slightly wet wiper... Any better solution is welcome: so thank you for sharing the link.</p><p>Sebasol (http://www.sebasol.ch/ in Switzerland) is also working on self made solar collectors: I don't know the detail of their solution...</p>
<p>Hmm, I think this misses the elephant in the room, that electrickery is a finite reasorce, and should not be squandered. No studies yet, but it has been mooted in pubs and bars that solar collectors are depleting the sun, it does seem to be getting dimmer if you look at it for along time, so perhaps we should investigate this before we encourage draining what is basically a big yellow battery in the sky.</p>
<p>whilst reading your comment a little part of me just died.</p>
<p>I agree !!!</p>
I feel for you brother. What are your views on very small nuclear reactors to sort our power problems? Size of a container, solid state, utterly bomb proof, one in every town (perhaps under the church) and it's electric cars all round. And when they're used up, sink them into the subsuming undersea trench where they'll be recycled into the magma.
Like a valence electron sinking into the quantum vacuum?
<p>Best two comments yet .</p><p>Made me lol that hard I got tears.</p><p>Thanks guys. </p>
Wow richardsonaboat I really hope you're joking, but if you're not, it is an impossibility to deplete something that is going to put out its light and energy whether we use it or not. And if you want to know why the sun is dimming you can thank the US government for that and if you look up chemtrail global skywatch you'll find your answers of how they are doing it.
Is that true? If the sun was surrounded by a huge mirrored sphere, it would burn for a lot longer, much like a well insulated house. So the fact we on earth are sucking the heat out of the sun is like leaving the door open. It might be a small effect, but so is a butterfly farting in the desert, and according to ancient Egyptian inscriptions, at one stage the pyramids were new and nicely painted, and in those same inscriptions the sun certainly looks a little larger. And more yellow.<br>
<p>I like the idea. Kind of like heliostats. Those satellite dishes can concentrate a lot of heat when lined with something reflective. Check out solar death rays. A single 4' by 8' sheet mirror could be flexed into a parabolic shape and do the the same thing and with only one tracker.</p>
<p>This is a great idea, I love the split mirror, however why would you use 20 stepper motors? They have slippage and can easily degrade their accuracy over time, they require relatively advanced control software, and they aren't cheep. You could have accomplished this with some cheap servos much easier. They have potentiometers so they never lose their position, they only require a PWM signal, and they are likely to have much smaller steps then stepper motors. Unless you need more than 360 degrees of rotation it makes no sense to use a stepper. </p>
<p>I enjoyed the instructable but I think there are better solutions. </p><p>You may wish to consider that the most efficient use of the available sunlight occurs when the receiver and the Mirror field is not flat/horizontal but is elevated to the location's latitude offset for the season. This way the mirror field casts the largest shadow - meaning it reflects the most light. Your flat mirror design will be less efficient because the mirrors will be in partial shadow of the mirrors in front (or will be placed far apart and therefore less space-efficient). By making your receiver angled you then can replace the flat mirror field with a parabola mirror, and then you don't need 20 stepper motors but a single motor to move the entire mirror as a unit. </p><p>Just my opinions. Best Wishes.</p>
<p>Thanks for sharing your ideas.</p><p>Inclining the receiver is possible at that scale. But the idea is to have a modular system: you size your installation by connecting the suitable number of modules together. You might lose in efficiency, but the system can be integrated on a rooftop and is generaly cheaper thanks to low wind load, a light structure.</p><p>The tracking is intended to evovle to 1 single motor, which is also possible with the Linear Fresnel design, as all mirrors rotate the same speed (tracking the same sun ;).</p>
<p>I concur, Exactly what I thought, I lined a used satilite dish with mirrors a 1meter and i could start fires with can you imagine what a 3 meter would do. You could easily have it track the sun, Old dishes can be picked up for free and minor adjustments can make them track. I could do it and may do it ,Im retired tradesman. </p>
<p>I loved this instructable gets the mind working over time. I agree that there are more efficient designs out there, but i wonder if the authors were aiming this towards developing countries. The stepper would suggest maybe not, but not using old dishes or concave mirrors, basically simple materials and methods, makes me think they were heading in that direction. </p><p>Just my thoughts.</p>
<p>Your statement &quot;Current levels of energy consumption are generally unsustainable&quot; </p><p>seems contradictory in light of what you have designed and built. Might be more accurate to say that &quot;many of the energy sources used today seem unsustainable, indicating a need for alternative sources&quot;. </p><p>The use of multiple stepper motors might be replaced with non-linear lever linkages and single motors to control multiple mirrors. A little math would be needed to do the design but it does seem feasible. </p><p>While digital electronics to control things is the norm today, it may be possible to use a different and simpler arrangement for mirror positioning, with the result being less cost and increased ease of design and simpler maintenance. An opaque vane standing vertical between a pair of light sensors can drive a differential amplifier to generate turn-left or turn-right drive to small DC gear-motors. This would use less expensive motors, be easier to understand, and simpler to build and maintain. If it is desirable to have a dedicated motor for each mirror, this compact design could be implemented at one end of each mirror. Adding a PV cell could them make each mirror and it's control system autonomous and self-powered.</p><p>This design is a good one and reflects the amount of thought and design work that is needed today to simplify methods and make the technology available on smaller scale than is being done in large commercial enterprises, like the system known as &quot;Nevada Solar One&quot; &lt;https://en.wikipedia.org/wiki/Nevada_Solar_One&gt;</p>
<p>Thanks for the ideas!</p><p>On the tracking system, indeed we plan on using 1 single motor to track all mirror facets. It's easy and straightforward because all mirrors rotate the same speed. The only challenge is keeping the orientation at 0.1&deg; of precision.</p><p>Agreed: making appropriate technology (simple, robust) needs work ;)</p>
<p>Superbe projet, et bien document&eacute; en plus.</p><p>Il y a quelque chose qui me g&egrave;ne quand m&ecirc;me fortement sur ce d&eacute;monstrateur, visiblement il y a un moteur pas-&agrave;-pas par lame.</p><p>Autant le projet permet de r&eacute;cup&eacute;rer de l&rsquo;&eacute;nergie solaire, et a donc une port&eacute;e &eacute;cologique importante, autant autant de stepper vont &agrave; l'oppos&eacute; des gaines en &quot;&eacute;nergie grise&quot;/CO&sup2; et tout le reste...</p><p>Vous pouvez astucieusement faire &eacute;voluer &ccedil;a pour un cout ridicule en pla&ccedil;ant des leviers sur chaque axe de rotation et tout les leviers pilot&eacute;s par un seul moteur.</p><p>Pour avoir assez de force, la vitesse n'&eacute;tant pas importante, il sera bon de faire suivre le moteur d'un r&eacute;ducteur pour que la course totale se fasse pour par exemple 5 ou 10 tours du stepper.</p><p>En faisant des leviers de longueur diff&eacute;rente pour chaque lame, vous pouvez optimiser la course angulaire de chaque panneau pour qu'ils visent tous le collecteur.</p><p>Sinon, j'adore !!!</p>
<p>Merci ! Exact : le suivi des miroirs avec un seul moteur est possible et c'est l'objectif pour le prochain protoype :)</p>
<p>Bravo! Ne vous en faitent pas trop avec le nombre de commentaires &quot;constructifs&quot;. Cette communaut&eacute; d&eacute;borde de gens qui sont tr&egrave;s investi dans leurs propres concepts. Des gens qui sont obs&eacute;d&eacute; par l'efficacit&eacute; (c'est normal, compte tenu de la nature m&ecirc;me de cette source d'&eacute;nergie) J'aime beaucoup ce que vous avez cr&eacute;&eacute;. </p>
<p> I applaud the fact that you got up and did it. </p>
<p>this is by far one of the best insructables i have seen thank you job well done</p>
<p>When ever I see a solar project like this the cynic inside me has to come out to play and say &quot;Solar power? Think of the ecosystem. Sunlight being absorbed by the panels/solar collection system is not being used to heat the ground which cools the air and thus causes massive planet destroying tornado's to happen. </p><p>Since the first solar panel was put up in 1908 by Frans Sunstealer, the human race has been destroyed by tornado's 19.8 times a year.</p>
<p>I am surprised people took this seriously o: <br><br>On a side note the tornado's would make for good wind power generation!</p>
<p>Funny, the last time I checked, the human race is still alive and kicking. How does it manage to evolve again over 19.8 times a year, and what about all the tornado activity prior to 1908?</p><p>To the authors, WELL DONE! This could certainly provide or supplement energy in many areas without generation of greenhouse gasses.</p>
<p>No. The energy absorbed by the collector is dissipated somewhere else, thus heating up the rest of the world. Probably more than an equivalent pile of snow, but less than the fossil fuel it replaces. </p><p>Also, the human race has not been destroyed by tornadoes, nor is there any evidence to show that solar power contributes to tornado generation. </p>
<p>What DonCenzo said! A BIG Thanks for doing all this, and sharing such a well written 'ible. Upvoted, fer sure.</p>
<p>Nicely done. Upvoted, Liked, Etc.</p>
<p>This is a MASTERWORK of an Instructable. While it's complex and sophisticated the text and the photos are thorough and complete. This would make an excellent high school or college level alternative energy project, not to mention an excellent tool for those seeking to be more eco-friendly, or who've chosen an &quot;off-the-grid&quot; lifestyle. In my readings and experience with solar and alternative energy systems I've found many to be best suited to &quot;proof of concept&quot; and some, while functional, clearly more hacked together or primitive in design or execution. Anyone with access to fabrication tools and related tradespersons could easily produce these commercially, with only the slightest of cosmetic changes for finish and packaging. KUDOS &amp; CONGRATULATIONS on your masterpiece. </p>
<p>fascinating read and a great project.</p><p>merci beaucoup...</p>
<p>Excellent effort. I bet someone who could fund you can make a lot of money with a serial production of the components for DIY packs.</p>
<p>excellent </p>
That is an amazing project! Thank you so much for sharing it! How accurate have you found the multiple stepper motors to be? <br><br>Have a great day! :-)

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