Tethered electrically driven Ag vehicles/equipment is not new. In areas of the U.S. where rainfall is not when and where you want it, farmers may opt to use ground water pumped into a central pivot water system http://en.wikipedia.org/wiki/Center_pivot_irrigation#Overview [video http://www.youtube.com/watch?v=pTluHs-PCT0 Center Pivot irrigation TRAXCO· Oct 1, 2010 http://www.traxco.com - Center pivot systems were born to save human labor, evolved so fast, adjusting to the expansion of human knowledge. Nowadays, center Pivots are accepted as a method of water application that promotes efficient water use. Some others describe them as machines that could make it rain anytime we needed it to. The sprinkling sound of a center pivot system is the rhythm of many farms around the world. ]
Using Google maps in satellite mode, see http://goo.gl/maps/hhweN The circles are using a central pivot irrigation system. In that example, it is an arid region, but there is ample water flowing down the nearby Colorado River to tap into. ... On David comment on grid powered mining EVs, see (half-way down the page) http://insideevs.com/electric-vehicles-go-underground-way-underground/ ... Svedlung: The loaders are hundred percent electric and they’re powered by cable directly off the grid. The working area of mining loaders is usually quite confined, so it can run [off] a cable ... {brucedp.150m.com} - On Fri, Feb 21, 2014, at 01:49 AM, Martin WINLOW wrote: > Dear List, > > I was having a chat recently at work (which is nothing whatsoever to do > with EVs!) about how vehicles that traditionally use lots of energy would > ever be able to switch to electric power due to limitations on energy > density. Fuel cell tractors came up amongst other things and then one of > my colleagues who, on learning of the enormous amounts of power required > by combine harvesters and plough-pulling tractors, jokingly suggested > using 'a very long extension lead'. Whilst he is an ill-informed > bumpkin, the thought did occur that in an agricultural context powering > machines directly from the grid might not be so daft. I immediately > thought of those enormous irrigation contraptions that work their way up > and down huge fields, laying and unlaying the hose that supplies the > irrigation water as it goes. Could not the same technique be applied to > tractors etc? Each field would have a connection point with power > brought in either above or below ground in the 'usual' way. > > An alternative idea would be to have mobile battery swap facilities > connected to the grid in each field and be moved from field to field as > the work progressed. - -- http://www.fastmail.fm - Faster than the air-speed velocity of an unladen european swallow _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
