heathyoung wrote:I'm in the process of building one up at the moment as well, getting parts for these is ... interesting.
oatnet wrote:Just the strangest thing...
So this guy Steve Lam posts on visforvoltage\vectrix, that he is selling a Vectrix 30 miles away from me.
It isn't running, it's been dropped and scraped down the side (these bikes need service after being on their side), so it is a parts bike and he is offering it for $1,500. It would be a pain to store it, but its a reasonable price for a parts bike, so I email him. He replies that he'll send me a picture of the damage, but never does.
I forgot about it until I came across the email a week later, so I emailed him again, saying I figure he sold it since I didn't get a picture. He replies that he lost his phone, sends me pictures, and it looks pretty bad, but $1,500 is still an OK price for a parts bike. I tell him I'll take it at his asking price, and lay out some proposals for flat-bedding the dead bike to complete the exchange.
He writes back that "$1,500 is way too low of an offer" and if it doesn't sell, then he'll advertise it on a Vectrix forum where they appreciate the value of a parts bike (which is where I saw it in the first place).
Huh? Offer? I gave him his ask out of the gate! Now he wants a price that is only $200 less than I paid the Dealer for my Brand-New Vectrix.
I forward him his $1,500 post I responded to, and he says "Pointed JD. I will move on to other buyers."
Truly, Fully Bizzare. Sometimes, when you walk away from a deal, you realize that maybe you just dodged a bullet...
oatnet wrote:heathyoung wrote:I'm in the process of building one up at the moment as well, getting parts for these is ... interesting.
What parts are you looking for?
My V's battery is showing its age. It still does my commute fine, but I am seeing higher temps on my pack, which means a cell low/dead/reversed and is heating up, which means it is gonna mess up the cells around it and do the same to them. Normally my bike would sit at 24-26c, and heat up to 28-29c during the ride. Now it heats up to 30-31 (where the cooling system really kicks in), and while pre-charge cooling gets it under 30, after sitting in the cool garage all night it actually heats up a few degrees instead of dropping to 26-24c.
So I'm going to replace the pack. I wrote down the size of the battery enclosure when I did the fuse change, but I lost those numbers. My conservative measurements made me think I could not fit a headway pack in there, so I had been considering a123's.
However, on visforvoltage, I recently read a post that said "the case is 225mm wide rather than 230. The frame is just shy of 230. You do have a tad more lenght, i.e. 710mm and you could get by with 340mm in high". So, 225mm x 340mm x 710mm = 8.86" x 13.39" x 27.95".If those numbers are accurate, I actually can fit a 45a5p Headway 38120s pack into that space. The plan is to move the 8kw Headway pack from my VW bus conversion into the vectrix, and I'll store the vectrix pack in the VW Bus, which only gets moved for street cleaning anyhow. This way the upgrade is free!
My biggest concern was the length of the box - but it looks like 5 headway cells, end-to-end, is @27", so I have just enough room to spare. 5 row of these cells in parallel is 7.5", so I have 1.5" across the width to spare. Unfortunately, I only have space to stack (8) of the 5s5p layers, yielding 40s, instead of the 45s I want. However, if I use the 3-hole Headway blocks instead of the 2-hole, I make the pack wider (it should just barely fit) but I can easily fit 9 rows in the height.
The Vectrix controller will handle 155v, and the charger goes up to 152v. 45s cells @3.65v nominal =164.25v, so some folks might be seeing a problem. However, 155/45=3.44v/cell, and headways quickly drop to a resting voltage of @3.4v after the charge, so when I charge/balance externally it will drop back into the 155v range, or maybe I'll string up a discharge circuit to bleed off some of the fluff. Most of the time I'll use the onboard charger, which should charge to 152v/3.38v/cell. I am expecting an average 2c discharge, @3.1v/cell, or 139.5v under load. That is higher than the starting voltage of the saggy NiMh pack, which translates to a more energetic bike.
I'll re-use the copper paralleling strips/fuses from the Bus conversion. I'm about to order blocks/connecting bars from headway, just wanna feel comfortable about the size of the pack. I need to make a temperature-sensor harness so I don't have to strip the one from the old pack. Then, maybe on my next vacation, I'll tear the old pack down, re-build it, pull the pack from the V and put it in the bus, then install the new pack into the V. That will be a tough week, but worth it to double the effective capacity of the pack, and lighten it by 16% (31.25lbs)
Hey, if the battery tub is empty on your bike, can you measure the usable length for me, maybe shoot a few pics of the empty tub?
By all means, its completly empty at the moment, waiting for some batteries, I was thinking of going the road less travelled with headways (on the V, they are all using thundersky batteries, while cheap, are pretty uninspiring in terms of C rate). I was thinking the 16A versions, probably 42S2P, its only a commuter bike so less weight is a good thing.
Gordo wrote:I'm a little confused on the TS discharge rating? Many suppliers rate them only 2C yet the published curve shows 5C
And then I see you mention 3C. Is it a matter of real 3C vs BS 5C and conservative 2C?
I have 20 X 40Ah TS cells and my controller limits the max power to 100A. The BMS manufacturer also said it must be minimum 100A. So 2.5C for safe, no smoke operation?
That might be a good reason not to spend money for lighter batteries but its not a good reason not to use lighter batteries. Very easy to add ballast, and thats probably better as you can tune it to what feels like the ideal weight. 80ah of 45s A123 prismatic's would make an awesome Vectrix!oatnet wrote:I considered doing 2p42s of the a123, cutting 115lb out if the 200lb pack, until I found out that too light could be bad. The hub motor and gear box represent a significant sprung mass which is offset by the weight of the bike. Going too light in the pack could impact rideability. I realized i can make the bike peppier just by increasing the voltage to 45s - and i don't want to ever have range anxiety again, so I am happy to fill it up. I could fit at least 80ah, maybe 100ah, of the a123 prisimatics in there - that would be 15kw.
MitchJi wrote:That might be a good reason not to spend money for lighter batteries but its not a good reason not to use lighter batteries. Very easy to add ballast, and thats probably better as you can tune it to what feels like the ideal weight. 80ah of 45s A123 prismatic's would make an awesome Vectrix!
Or a Cycle Analyst .heathyoung wrote:The thing that complains about the battery temperature, voltage blah blah is the (rather crappy) charger.
If you get rid of it, you get no problems, and you have a voltage meter on the dash rather than the inaccurate 'AH' gauge.
darkshirikens wrote:That is nice build video and music was a nice touch lol how many Ah does your have ?
When you get to ride it let us know the difference in the feel of it before and after.
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