Rix wrote: ↑
Dec 27 2018 10:35am
Very nice build, need to make a video of it in action.
I actually have a lot of gopro footage from the 500km I have done on the bike so far, I may release the vids as an unlisted youtube video some time soon - however, most of the footage isn't super exciting anyway as I have only recently become comfortable corning a bit harder on it, however I've found my way onto some really incredible trails , I was actually planning on going back to them tomorrow, so I'll bring along the gopro and see how I get on.
Cowardlyduck wrote: ↑
Dec 27 2018 4:33pm
\ (•◡•) / wrote: ↑
Dec 26 2018 11:58pm
Now that my Alpha has been finished for a number of weeks, I think it's time to share some photos of it!
Nice build! Really like the battery.
I take a different approach for current carrying capability. I layer up multiple spot welded nickle strips on top. Seems to be working for my 14S14P Fighter pack with 6 x 4 series layers per parallel group.
I'll be taking the same approach but with 6 layers for the 18S14P battery I'll see building for the buyer of my Alpha over the coming weeks.
Doing it this way minimises added height in the battery and eliminates the need to solder. That being said if I wasn't doing 14P I think we copper approach is totally valid for lower parallel count groups like yours.
I though about doing that, yet decided on the copper as I can discharge my battery at peaks of 150-200amps, So wanted something that could carry a huge amount of current, plus just with the .3mm nickel I used i went through 85$ of nickel strip (used two 10 metres rolls of .3mm x 10mm nickel) - Glad to here it's working for you though, I'm sure it's certainly making for a thin layer in comparison to the copper, come to think of it 4 strands of 11awg solid copper plus the .3mm nickel was probably overkill as the hottest i have seen is get was 33 Celsius on a hot day when the cells were also 33 (so was probably the cells were just heating the nickel), and that was after a 60km ride on one charge when I road along an incredible track that just didn't stop!
Also I forgot to mention some specs about the bike if anyone is interested
power - 16,800 theoretical watts from full charge, the power comes from:
battery: 20s 10p battery of LG HG2 cells, which are rated at 20amp continuous discharge and 25amp peak bursts, so hot off the charger the battery can deliver 200a at 84v, I've yet to use more than the 95amps the controller is currently programmed at, which keeps everything super cool and still puts a big smile on my face at 8kw, the bike on cruise control at 50kmh uses less than 2kw (it's around 30wh/km), which is what I use when commuting on roads - I really want my battery to last many thousands of km's - too much love and labour went into it to abuse it haha.
On the cell's datasheet even at 15a continuous discharge the cells still hold 2200mah after 600 cycles - so even if i could somehow use 11-12kw continuous for every ride i'd get at least 35,000km out of the battery, probably more like 50,000km - however that's not considering the short range that would come from the inefficiency of 11kw cruise and all the extra drag and such high speeds - anyway i'm a happy man with that lifespan, still a lot cheaper and much more fun than paying for petrol.
also I feel I should mention i'm loving the range with 30ah, plotting along on a bike path or trail the percentage hardly moves.
controller: 200a powervelocity sine-wave controller which can deliver the full 84v at 200a to the motor with 450 phase amps
motor - QS205v3 4T (7awg phase wires) with ferrofluid and hubsinks all sealed with high temp silicon gasket - highest temp recorded so far after 8kw speed runs spread out through a 10km ride was 85celcius
19" moto rims front and rear with shinko 241 19 x 2.75 tires
hope tech 3 v4 brakes front and rear
203mm hope floating rotors front and rear
as far as future upgrades now i'm just considering getting a 3 speed schlumpf alternative on the front and a rockguardz front carbon mudguard which i'll have to custom mould some new plastic fork guards to mount the mudguard to - damn you inverted forks.
I wish someone sold custom made fork boots with the wheel arch thing at the top like standard forks have, exactly like what the dvo emerald forks have - I guess i'll just have to made them myself in the coming weeks/ months - I have also asked the guy who helped me manufacture the torque arms about this and am currently planning something which I may even sell to others here running the DNM USD 8's if I can get the design/ manufacturing right and affordable - could perhaps be popular amongst the new stealth's running the usd8's on the front?