Curious what is the max instantaneous amp draw on the truck? You retained the transmission/clutch? I think the max I see on my analog meter with the EMC is around 200, typical 100+, and at lower maintained speeds 50 + or -.
I wonder if at 72V and up if a 450 amp controller is required/utilized on an EMC. Garrett and I ran our bikes on the same route one day side by side and his may be a bit lighter because of the NiCad, but had similar performance, mine just slightly slower. He has a 450 amp controller mine is a 300. He is running an ETEK which gets pretty warm, much hotter than my Perm 132 btw. His Perm is on the swing arm in the air, my Perm is buried inside the frame, fairing but has the 6 small micro-fans (but my motor never got too hot to hold my hand on it before the fans. My controller never gets more than warm, there is no external heatsink required. Just an FYI on the last. IMHO: For those on the fence between the ETEK and the Perm, the Perm being designed to handle 72V handles heat better, and can be equipped with an air source on the brush side of the motor (not the brush cover) to push air through the plentiful slots and the air outputs on the shaft side. I turn the fans on at startup and I notice a significant difference from the pre-fan days. I measured with a laser temp gage, approximately a 30 degree difference. I wish I had written down the readings. Maybe on the next project I will be more detailed. Jeff On Jan 29, 2008 11:03 AM, damon henry <[EMAIL PROTECTED]> wrote: > > Everything on this truck is a bit undersized, but I am trying to see what I > can get away with in order to use less lithium. So I have started with an > Alltrax 72 volt 450 amp controller, 480lbs of BB600 Nicads in two strings of > ~81 volts and an 8 brush ADC 6.7 motor. The truck itself is a 1970 Datsun > 520. I have not weighed the truck yet, but I believe the stock weight was > around 2200 lbs. > > I have just recently started taking it on short excursions, and my goal is > to get 20 miles range with this setup. I'm still dialing it in for > efficency and about 20% above my energy usage goals. If I can get the > range that I want with my Nicads, and I'm OK with the performance then I > will start looking at a lithium solution. I would expect to be able to get > the truck in the 50 to 70 mile range with a 72v 200ahr pack. > > Right now I am in phase one of what I consider to be a very long term > commitment, so I have been focused on putting the 38 year old truck back > together in a way that will last a long time and look great. It's been a > lot of fun. > > If I am not happy with the performance at 72 volts then the next step will > be to upgrade to a Zilla and likely add more battery weight. I may also > upgrade the motor to something bigger if I feel it is necessary. I do have > this motor setup for forced air cooling which should help, and I am still > optimistic that it has been beefed up enough (I spent two days of last > Spring Break in Jim Husted's shop with my 16 year old son and the motor) to > get the job done. > > damon > > > Date: Tue, 29 Jan 2008 09:25:31 -0700 > > From: [EMAIL PROTECTED] > > To: [email protected] > > Subject: Re: [ElectricMotorcycles] Lithium vs lead? > > > > > Damon > > > > What is the weight of the truck? What motor? Batteries? Controller > > amps (Regen)? Range, etc? My next project will be 72V also and curious > > as to your success. I am thinking D&D Series Wound because of the > > larger mass to move (1200 lb sans people). Also thinking of the Harley > > trans using two gears to give decent acceleration, space not big > > consideration. Not having to cram like the EMC. > > > ________________________________ > Need to know the score, the latest news, or you need your Hotmail(R)-get your > "fix". Check it out. >
