0utrider
100 W
skyungjae said:Considering that I placed my order over a month ago and there are still no signs of them shipping.
Crikey!
skyungjae said:Considering that I placed my order over a month ago and there are still no signs of them shipping.
I imagine shipping to the USA is crazy high, but your spider seems to be one of the better price points.Samd said:jpo said:Bafang make a 42 tooth chain ring.
Does anyone one where to find one?
I make 104 bcd spider adapters, in the for sale section or on fleabay...
20Amp! Should be able to go to the moon and back!MargoC said:Both bikes have Bafang 350W 36V BBS motor and 20 Ah LiFePo4 battery.
0utrider
20Amp! Should be able to go to the moon and back!
MargoC said:Off-topic, as this bike doesn’t have BBS, Liberator Jäägermeister will have even bigger battery – more than 40 Ah (don’t remember exact amount). When it’s finished we’ll see, what range it will have.
tungsten2k said:I bought an older 2001 KHS bike with many great upgrades
tungsten2k said:Has anyone done an efficiency test between running a 750W at 36v vs. 48v ? Is the brushless controller any more efficient running on 48V vs 36V, given everything else being identical ? Or is it the other way around and 36V is more efficient for the controller ?
tungsten2k said:I have not built a prgramming cable yet
tungsten2k said:At top speed it will do over 30MPH but I'm fine with a top speed closer to 20MPH, so I think I would like to drop the front CR down to 42 or something using one of the many CR adapters.
tungsten2k said:The Frame doesn't have the space to hold all 6 packs for a 10A 48V setup (and I don't think I need the 444Whr for my needs, so would prefer less weight)
tungsten2k said:Has anyone done an efficiency test between running a 750W at 36v vs. 48v ? Is the brushless controller any more efficient running on 48V vs 36V, given everything else being identical ? Or is it the other way around and 36V is more efficient for the controller ?
I did some testing and with my 43 lb bike (30lb bike, BBS02, and 3x HK 4S1P 20C LiPo hardbacks), the 12S setup seems to have far more power than I typically need and I find myself on PAS2 almost exclusively. Obviously it's nice to have it power up the hills, but on PAS2 ( the very bad stock 5-level programming that came on the GBK and I have not built a prgramming cable yet) it won't climb the hills in the lowest gear at PAS2 and I can't really assist due to gearing, so I bump it up to PAS5 and it climbs faster than I can really assist (again, still due to gearing).
My gearing:
Stock 48T BBS02 front chain ring (stock on the bike was 42T)
11-32T SRAM 9-speed cassette
26" tires
At top speed it will do over 30MPH but I'm fine with a top speed closer to 20MPH, so I think I would like to drop the front CR down to 42 or something using one of the many CR adapters. This will also allow me to assist more on the hills, or allow a lower-voltage battery to comfortably pull the hill, but at a slower rate. I can yank the cells out of my HK hardpacks and craft a 36V 10A battery that will weight 0.25% more than my 48V 5A battery, but wondered will I gain more than 25% range due to improved efficency running at 36V, or will I eat up my 25% extra capacity due to 36V running overall less efficiently ? The Frame doesn't have the space to hold all 6 packs for a 10A 48V setup (and I don't think I need the 444Whr for my needs, so would prefer less weight):
If the answer is "nobody knows" it seems something that woud be interesting to find out.
-=dave
ps- I know a lot of my woes surely can be improved upon with proper PAS levels, but I still don't see a way around the gearing.
tln said:Running at 36V requires a whole new kit I believe, BBS01 = 36v BBS02 = 48v
tin said:I have some display cables coming from em2ev, I bought a few to amortize shipping. Let me know if you want one
jkbrigman said:Hi tungsten2k!
(UPDATE: tln is correct, the BBS01 is 36v and the BBS02 is 48-52v. I did not concern myself with answering that question, since it is easy to understand if you only browse http://www.em3ev.com. Your other questions interest me more.)
Are you sure your instrumentation is correct? You should see more amps but similar watts.jkbrigman said:1) When I see voltage decrease on my battery down into the 65-66v range, (near discharge) it takes MORE WATTS for me to maintain a given speed than it does when voltage is higher. That is:
Full charge (72v): cruise 23-25mph, 280 watts
Low charge (66v): cruise 23 mph, 450 watts
Not true. There is a maximum charge current per cell. If the cells are all in series then that is the maximum charging current for the battery. If you rearrange those same cells so there are two cells paralleled and each of these pairs are connected in series, you will have halved the battery voltage and doubled the maximum battery charge current which means power is supplied to the battery at the same rate. Charging current per cell will be unchanged as the current is split across two cells and therefore charging time will be unchanged.jkbrigman said:3) However: if you have a lower voltage but more batteries in PARALLEL, you can CHARGE FASTER. This is because what limits charging speed is how much current you can put into a battery. If you parallel, you can put much higher current into the total battery than you can into each brick.
I haven't but the difference at maximum efficiency will be small, nill according to a Bafang datasheet.tungsten2k said:Has anyone done an efficiency test between running a 750W at 36v vs. 48v ? Is the brushless controller any more efficient running on 48V vs 36V, given everything else being identical ? Or is it the other way around and 36V is more efficient for the controller ?
This is not an option without changing the motor. Expect 25% extra range with 25% extra battery capacity as a first approximation but range mostly depends on the balance between assist and pedaling power.tungsten2k said:I can yank the cells out of my HK hardpacks and craft a 36V 10A battery that will weight 0.25% more than my 48V 5A battery, but wondered will I gain more than 25% range due to improved efficency running at 36V, or will I eat up my 25% extra capacity due to 36V running overall less efficiently ?
With a mid drive, where you are expecting to pedal, the gearing should match you rather than the motor with the proviso that the lowest gear can be higher because on steep hills you can have higher gearing than you otherwise would as you will be faster with assist. Once the gearing matches you, the motor settings can be changed to provide your desired levels of assist.tungsten2k said:ps- I know a lot of my woes surely can be improved upon with proper PAS levels, but I still don't see a way around the gearing.
BBS02 36v and 48v versions have different motor winds according to this datasheet.RayGo said:The BBS02 also comes in a 36v 500w version. I'm told the BBS02 comes with either a 36v or 48v controller and they may be using the same motor, but I'm not sure. See em3ev.com for the 36v 500w version.
The motor power is nominal. Perhaps this is the 36V BBS01 with particular programming settings described differently by hi-powercycles.com for marketing purposes.RayGo said:hi-powercycles.com even has a 37v 750w setup.
They will be much the same if you get the same balance between assist and human power. lifep04 is lower energy to weight/volume than some other battery chemistries.RayGo said:I'm having trouble choosing between the 36v and 48v versions. I currently have a 36v lifep04 20AH battery and looking for more range. So your question about greater range between the 36v and 48v systems with the same battery capacity is of great interest to me. So if you are interested in more range and not greater speed, which battery would provide more range?
You've had some experience with the BBS02 and BBS01. Do you think the BBS02 controller would fit on a BBS01? I note that Em3EV uses the same photo for the BBS01 controller and BBS02 controller.Samd said:The units really just differ because the BBS02 motor is slightly beefier so it can take a bit more power/heat.
Negative. You cannot swap BBS01 & BBS02 controllers. The BBS01 is for a 36V battery and the BBS02 is for 44V-54V Battery.Ken Taylor said:You've had some experience with the BBS02 and BBS01. Do you think the BBS02 controller would fit on a BBS01? I note that Em3EV uses the same photo for the BBS01 controller and BBS02 controller.
The reason for wanting to swap was so the BBS01 could run on 48V. That would allow the maximum cadence to increase by 25% to about 112 rpm which would match maximum human cadence better without having to go to a heavier BBS02.teslanv said:Negative. You cannot swap BBS01 & BBS02 controllers. The BBS01 is for a 36V battery and the BBS02 is for 44V-54V Battery.Ken Taylor said:You've had some experience with the BBS02 and BBS01. Do you think the BBS02 controller would fit on a BBS01? I note that Em3EV uses the same photo for the BBS01 controller and BBS02 controller.
The motor wind is different as well.RayGo said:I was toying with the idea of getting the 36v 500w BBS02 unit now since I have a 36v battery. Then when the 36v battery died, I could get a 48v battery and reprogram the BBS02 controller to 48v and 750w. So it really boils down to actual physical differences between the 36v and 48v controllers versus just programming changes.
Yes, because it is physically bigger and heavier with more cells. Range is proportional to watt hours if you keep the same riding style. In general, range is uncorrelated with battery voltage.RayGo said:However, I'm still not sure about the range capability of a 36v vs. 48v battery. Let's assume a 36v 10Ah vs. 48v 10Ah battery. The 36v battery gives 360watt-hours vs. the 48v battery giving 480wh. So its 360wh vs. 480wh of energy. Will this translate in the real world of e-biking, all else being the same, to greater range with the 48v battery with 48v motor?
The V8 is likely to be operating at a point of lower efficiency but under the right circumstances the V8 could give better mpg. The higher voltage motor is not, in general, less efficient. In the Bafang table above it shows the same maximum efficiency for both motors. If you travel faster with either the V8 or e-bike the range or mpg goes down fast because power used to push through air goes up with speed cubed.RayGo said:Or will the power consumption of the higher voltage motor use up this additional energy and result in just marginal difference in distance over the 36v BBS02 with 36v battery? My analogy is a V6 vs. V8 gas engine. The V8 may have more power and speed, but the V6 will produce the greater mpg. Anybody know the answer to his question or have any experience to share?
Samd said:No! Shipping is really cheap as it qualifies for lowest price with Australia Post by air.
I think I have International Post enabled on the new site, but you can find them on Ebay US if not. Pm me if I have frocked it though!
http://ballaratebikes.com/products/bafang-bbs0x-104bcd-chainring-adapter