https://wiki.opensourceecology.org/api.php?action=feedcontributions&feedformat=atom&user=KLOpen Source Ecology - User contributions [en]2026-04-22T05:23:04ZUser contributionsMediaWiki 1.39.13https://wiki.opensourceecology.org/index.php?title=Kostas_Latoufis&diff=143575Kostas Latoufis2016-08-28T18:41:04Z<p>KL: </p>
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<div>*800 euro - 2.4m diameter rotor - 600W maximum 10m/s. 5 m/s has around - 110 Watts +/-20W<br />
*Axial flux design<br />
*30 cm diameter, disk, steel<br />
*RPM at 10 m/s 400 rpm<br />
*need back iron thickness so you don't saturate the iron<br />
*Permanent deflection of back iron happens for larger <br />
*1200 kwh 5m/s. about 3 kwhr/day<br />
*Equivalent to a 500W solar array but depends on mean wind speed<br />
*30% efficiency wind to batteries, not including charging loss of batteries.<br />
*Generator designs are about 87% efficient and down to 80% as power increases. Need more magnets to increase efficiency, then need less copper in stator.<br />
*Direct connect to battery - no maximum power point tracking<br />
*To connect to existing system - 300 Euro for tower/guy wires/concrete if necessary if no big rocks. 100Euro for cable. Diversion charge controller - goes to a resistor if too much - 250 euro - and resistor is $250 euro. Resistor is a thin wire wound around a metal cylinder for good heat dissipation. Surge power of 1kW of resistor.<br />
*Solar panels - just mounting structure + charge controller - $100<br />
*Magnets themselves cost - 10 euro per piece - need 24. 5 euro in bulk - 100 MOQ.<br />
*No iron core for <br />
*Powdered iron mixed in the resin - so you concentrate electric field in the core. For same amount of magnet, get more power. Typically lower efficiency when you have a core, but higher power density. With core, may be down to 75% efficient. <br />
*Core generator might need external cooling - fan on rotor.<br />
*Coreless is more expensive<br />
*Similar to [http://www.ginlong.com/en/Wind_Products/GL_PMG_500A.html] - larger ones - [http://www.ginlong.com/en/PMG.html]. 760 kg for 30kw.<br />
*ST generator head - 20kw - 365 lb -- $800 - http://www.ebay.com/itm/20KW-ST-Generator-Head-1-Phase-for-Diesel-or-Gas-Engine-60Hz-/331914210831. Compare to 585 lb for radial flux - http://www.ginlong.com/en/Wind_Products/GL_PMG_20K.html<br />
*[http://www.cgg1.com/ST%202-bearing%20120-240V.htm] - <br />
*Hugh - it works well, needs few days to be built, building a wind turbine in one day is the next step.<br />
*Hydro turbine - Turgorunner open source design, 3d printed runners. There's a guy in the USA who does turbine work.<br />
*What are the collaborative design tools.<br />
*Max in Germany makes blades in 2 hours. He is a fun guy.</div>KL