Mounted only to the forks as are the handlebars. Go back to the beginning of the thread.
Andje wrote:Im picturing the moment as the front shock hits the ground. The bolts going though the box are horizontal to the moment.
Kepler wrote:1.5kW of capacity. Nice . I think this is about the right capacity for these high powered setups. Lets you ride them hard and still have decent range. I run 1.5kW usable in my Bomber and even when belting it around like a moto, I still get a solid 30 miles out of it.
So what is the weight of the box fully loaded with A123's? I will be interested to see what the all up weight of the bike comes to. 90lb possible?
I missed where you plan to mount the controller too.
andje wrote:I will assuredly look at some sort of similar solution as it seems to kill many fabrication birds with about half a stone.
Kepler wrote:Those bagged A123's are surprisingly close to the weight of LiPo's.
Kepler wrote:Where do you get those from? My LiPo's alone weigh 26.4lb. That is 15 x 6S 5000mah 20C Turnigy packs (weight of each pack on my digital scales is 800g)
oatnet wrote:Kepler wrote:Those bagged A123's are surprisingly close to the weight of LiPo's.
I've tried to make that point time and again, but the LiPo Bullies yell louder. It is far preferred to compare canned LiFe cells with pouched LiPo, IMO the weight of the cans makes a huge difference. Also the weight of the extra wiring to join LiPo packs, and the weight of BMS/HVC/LVC etc that a LiFe pack wouldn't need, should narrow or eliminate the gap.
The a123 prisimatics have very similar weight to HK Lipo, 30c rating, but with an inert cathode instead of one that is prone to thermal runaway. HK LiPo's have marginally lower IR, but IMO their main benefit is that they are 40% smaller, if volume is your design constraint. So far on my builds, I run out of places to put weight before I run out of space to put it. However, when I build a pack for 144v testing/exhibition, a 144v20ah pack of any chemistry would be way too heavy for my design constraints. Since I can't get I can't get 5ah or 10ah a123 prisimatics I might I might leverage LiPo's modularity and build a 36s/40s 5ah/10ah LiPo pack.Kepler wrote:Where do you get those from? My LiPo's alone weigh 26.4lb. That is 15 x 6S 5000mah 20C Turnigy packs (weight of each pack on my digital scales is 800g)
By my count, your pack has =15*5ah*(6s*4.2v)=1890wh in it. Mine has 24*3.65v*20ah=1752wh, a little less. On the "Spot-welding" thread below, I have a pic of this Pelican box with the 24s in it, plus (2) more clamps than I used here, weighing in at 27.4lbs.
Oatnet's Spot-Welding a123 Cells
I got a whole bunch from cell_man, he was out for a while, I think he has access to the 20ah cells again, I haven't seen the 16ah version anywhere else. Here is a thread of people checking out vendors of the a123 prisimatics.
a123 20ah Cells Source thread
Garrick_s wrote:Grant it, I do understand why.....no room anywhere else.
And the Pelican boxes are great boxes for that application, but the location just sucks.
Please Oatnet, do not take this little rant personally. I love your work.
Ypedal wrote:I'm going to have to test that handlbar mount thing you got going oatnet, it just seems " wrong " but i wont knock it until i try it !
Please remind me your pack voltage and capacity. IIRC you were running over 100V.What controller are you running?
Garrick_s wrote:By placing 30lbs at the HIGHEST point for C.O.G. on your bike (the handlebars) you will really notice this extra weight when making tight slow turns.
Just think about how touchy turning on a bicycle is already.....heck I can turn my bike with just body english.
Strap 30 lbs to the front fork and every movement you make would be amplified.
Grant it, the faster you go, the less the effect will be, but you will feel still it.
I ride Motorcross, so I know what you mean about putting your weight forward, but that weight is being distributed down thru the bike to offset gyroscopic effects as well as adding weight to the wheels for more traction. It is never DEAD weight sitting there in one spot.
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