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You might want to consider two contactors. One that engages first through a starting resister and the second to short out the resistor for full power. This will save the contacts in the contactor. David D. Nelson http://evalbum.com/1328 http://www.levforum.com Sent from my Nokia Lumia 920 Windows Phone 8 From: Michael K Johnson Sent: =E2=80=8E11/=E2=80=8E2/=E2=80=8E2013 14:20 To: Electric Vehicle Discussion List Subject: Re: [EVDL] Michael's 48V lawn tractor/mower conversion: sanity check On Nov 2, 2013 1:45 PM, "Bruce EVangel Parmenter" <[email protected]> wrote: > Others have already posted the answer to your initial question, and to > an EValbum page of a similar conversion. I could also have been clearer that I've viewed every EValbum page I could find on any lawn tractor conversion. In particular Joe Lorenzi's beautiful JD LA115 which is similar in nature but I suspect far more beautiful than what I will accomplish. He very kindly answered several questions about his conversion for me some months ago. I do intend to document it much more fully; this initial question was a very limited "hmm, have I put the right items in my online cart?" It's good to know that an album makes sense early on... I will work on that when I get a chance. > 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. Donor ICE: 2005 MTD Troy-bilt Bronco. I'd pondered the conversion and the need for a ring job pushed me over the edge. (My fault, don't ask...) Use goals: mow about 1/3 acre (or a bit less; it is rather irregular and I haven't measured exactly) once a week or so during the 8-9 month mowing season. Occasional towing duties but the mowing is by far the most significant requirement since running the mower deck will be more than half the load. Mowing the whole thing on one charge normally. That's currently a 25-30 minute job so I expect to be able to do that on group 27 deep cycle at about 60% DoD. (Also considering reducing lawn size a bit for unrelated reasons which would give more room for error.) Personalization: I go for vanilla as much as possible. No bumper stickers on my cars. Muted paint colors. No bling. My goal is a good job without frills. I have purchased almost all the major parts. The lugs and additional cable were the main remaining items to get started. I need to buy some angle to weld into a battery support system, and the batteries themselves. Waiting until the last moment to buy the batteries to not waste warranty. I do have 48V of UPS batteries available that I can use for idle testing and setting the brushes before I buy the system batteries. > At 48V, I will assume you are not looking for Stig inspired performance Not remotely. I'm not going to do any unbalanced pickoffs so I'll be able to use a single 48V charger (I got a Soneil constant current four stage). Planning to build a set of four independent zener+LED DoD indicators, one for each battery. I'm trying to keep the battery plant separate in the design on the theory that when these die a completely different technology might be available... What else? Using the ME1004 and hydrostatic drive I'll use a 400A contactor and no motor controller. I'm going to use 48V muffin fans and an air filter to move extra air through the motor and keep it clean to reduce wear. I bought a bank of four fans but will use only many as I need to keep the motor cool. My plan is to use 60 PPI reticulated foam for the air filter. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131102/9f= 0e0fda/attachment.htm> _______________________________________________ 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/gr= oup/NEDRA) _______________________________________________ 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)
