Welcome to the evdl Michael. Others have already posted the answer to your initial question, and to an EValbum page of a similar conversion.
We welcome more questions to help with your conversion, but it would be wise to invest a little of your time to create a free EValbum.com page of you own. It is free, simple, and you are not required to have pictures right way (you can add them later). That way we can see/read about your project and of what you are doing. Speaking of which, I did not read from your first post, what your project specifically is and what your use goals are (we care the people who want the nitty-gritty details). -Is it a from the ground up creation or are you using a donor ice model (if so what brand, model, year). The later will give us an idea of what it will not only look like but what the hp/performance needs are. So, what are you going to do to personalize your conversion? -Are you going to install a sound system like John Wayland's? http://bp1.blogger.com/_ASjyUZYBmhk/RptniSwT3DI/AAAAAAAABPM/VRO9HHvhOPk/s1600-h/IMG_8500.JPG http://evalbum.com/38 At 48V, I will assume you are not looking for Stig inspired performance of Honda's Mean Mower ice with two e-motor driven cutting blades http://www.themotorreport.com.au/content/image/h/o/honda_mean_mower_04-0718.jpg http://www.octanefreaks.com/project-mean-mower-29711.html http://www.autoblog.com/2013/07/17/honda-mean-mower-hits-60-mph-in-4-seconds-cuts-to-130-mph-w-vi/ Please post more details on your project and what your use-goals are (how fast, how far, total cost, what donor, how quick to recharge, etc.). {brucedp.150m.com} ... http://www.thefreedictionary.com/nitty-gritty ... http://evalbum.com/evreg.php Begin creating your own EValbum page - On Sat, Nov 2, 2013, at 08:06 AM, Michael K Johnson wrote: > I'm new to the list. I expect this has been discussed before but I > haven't found the right search terms. I apologize if so and would > appreciate a pointer. > > I'm also entirely new to EV conversions. I've been scouring the net, > and have purchased most of the items to convert my lawn tractor to an > EV this winter. I'm using the ME1004 as a "drop-in" replacement for > the ICE in my existing hydrostatic-drive donor tractor, not doing > separate deck motors. I know several of the things I'll want to do to > reduce loss (belts, bearings, lube, new sharp blades, etc.) and I > understand the single motor/multi motor tradeoffs and already have the > ME1004... ☺ > > From what I've seen so far, ME1004 conversions on lawn tractors at 48V > consume 70-100 amps while actually mowing, and may momentarily consume > up to 200 amps while spinning up the mower deck. > > I misread something somewhere (I don't even remember where anymore) as > indicating that since I expect to have 20 feet or shorter, I could use > 4AWG fine-strand welding cable, so I bought some. Then I learned that > this might have been somewhat optimistic, so I'm expecting to chalk > that up in the "mistakes" column. I found the helpful articles at > engineeringtoolbox.com and a few references on resistance of copper > wire and am trying to calculate real voltage drop instead of following > rules of thumb. In particular, I'm looking at > http://en.wikipedia.org/wiki/American_wire_gauge and > http://www.engineeringtoolbox.com/copper-wire-d_1429.html which both > have similar numbers for ohms per thousand feet for copper wire. > > I intend to fuse the conversion no larger than 400 amps and possibly > at 200 amps using an ANL fuse. So I've been calculating voltage drop > over 20 feet (and also, pessimistically, at 30 feet in case it takes > more cable than I expect) at 100 amps, 200 amps, and 400 amps. > > My understanding is that I want to keep the voltage drop below 2%, so > with some room for error it seems like I want less than 0.9V drop in > normal operation, and not go much above it momentarily. > > I'd like a sanity-check on my math, as well as the wisdom of the list > on recommended wire gauge... > > For resistance per Kft, I am using: > 1/0 awg: 0.09827 > 1 awg: 0.1239 > 4 awg: 0.2485 > > (I see no point in buying smaller than 1 awg if I replace the 4awg I > bought, so I'm ignoring 2 awg in my calculations.) > > It looks to me like the voltage drop per 10 feet at 100 amps is the > same as ohms per Kft, since I divide by 100 to get the resistance of > 10 feet, then multiply by 100 amps to get the voltage drop, so it > cancels out. Multiplying by 2 should give me voltage drop at 20 feet > at 100 A (my expected normal operation) and by 8 should give my > voltage drop at 20 feet at 400A. > > Since 1/0 awg is more than twice as expensive as 1 awg as well as > harder to work, I'd prefer to use 1 awg. I calculate that 1 awg > (0.1239 Ohms/Kft) should drop about 1/4V at 100A at 20 feet (max > normal load) and about 1V at 400A at 20 feet (max momentary load). > > Am I missing anything? > > Thanks much! - -- http://www.fastmail.fm - One of many happy users: http://www.fastmail.fm/help/overview_quotes.html _______________________________________________ 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)
