3000W SBP Battery Questions

Discussion in 'DIY Electric Bicycle Hub Motors and Kits' started by bluck, Feb 5, 2019.

  1. bluck

    bluck Member

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    Hi guys I am looking for the smallest amp battery to safely power the 3000W cyclone motor from Sick Bike Parts. I wanted to know where is the best place to get a battery preferably 52v and what amps should I get to keep the battery from dying to early. I would prefer a type of battery that mounts to the bottom tube of the frame. Something like those cylindrical batteries, I am not sure if they make any that shape for the amps I am going to need. A square or triangle pack is also fine though. I just want to know where I can get the best bang for your buck and not over pay. SBP also has their 3000w cyclone motor kit off the website so I cannot get any information from there. I expect around 20mile range maybe 25miles with pedaling so don't really need anything too crazy. I ordered the 48v version of the kit btw. Let me know if you need any more information from me.
     
  2. Tony01

    Tony01 Well-Known Member

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    Hobbyking multistars. They have a huge sale every spring.

    Far as ah and c requirements, 3000w at 50v is 60a. You can assume that’s continuous, and also assume a 5kw peak. Depends on your controller. The multistars are specd at 10c but people say they are only good to 4c max with 2.5c continuous or so. So I think a couple of 6s 16000mah bricks would do it. 16*2.5=40a
     
  3. bluck

    bluck Member

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    What do you mean by 10c and 2.5c? I should have mentioned this is my first electric bike build I have done many gas motor builds though. So not familiar with all the electrical talk haha. I have read on the voltage, watts, and amps so I understood what you meant on the first sentence just not the second.

    I have this controller:
    http://sickbikeparts.com/36v-72v-cyclone-programmable-controller/

    My throttle is a 40v twist throttle.

    Those batteries you mentioned do I have to wire them together myself?
     
  4. Tony01

    Tony01 Well-Known Member

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    yeah but it is only two bricks you have to wire, make sure you wire them in series for 12s.

    you might want to spend some time on endless sphere forums. I'm building my first ebike as well and the learning curve is very steep.

    C rating is a charge rate. A battery rated for 1C continuous discharge, can theoretically provide its capacitance without voltage sagging. Ie. a 5ah cell rated for 10c cont discharge and 2c charge can theoretically output 50amps and be charged at 10 amps. The battery in your cell phone probably around a 1600mah is probably rated for .5c and can do 800mah continuously. but a cell phone doesn't need high current, it needs enough current for a longer time. So a cheaper, lower C rate battery goes into the phone.

    Since most battery ratings are on the high side, and voltage sag is a thing, you generally dont want to pull more than about 1/4 the rated C rate. so on a 16ah HK multistar rated for 10c or 160 amps, it'll run better and sag much less if you only pull 40a from it.
     
    #4 Tony01, Feb 5, 2019
    Last edited: Feb 16, 2019
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  5. Velodrome

    Velodrome Well-Known Member

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    Your controller is 48v but your wanting a 52v ? Will your controller accept 52v ( closer to 60v on a full charge ) without letting the smoke out? If the smoke comes out of the box you'll need a new controller. It has to stay IN the box.
     
  6. Nashville Kat

    Nashville Kat Well-Known Member

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    The batteries are usually a higher voltage peak than advertised- my 36v sets- run series of ten 18650 so that comes out to 42 v - 36v is the middle working range- I haven't looked into higher voltage- 36 suits my needs- especially now using Hoverboard packs- 52 sounds about normal high end of a "48v" system.

    On the other hand- I've now put a 500 watt controller- 22 ah instead of the "usual" 13 or so ah onto my latest build with a 36v 250 watt hub. It pushes it almost, but not quite as quick, as the same kind of controller on my 500 watt build- and I don't feel it's straining it in any real way- the hub is the same size- they're mostly just rated differently- possibly even for marketing concerns.

    There's a lot of discussion on the web about running stronger controllers rated higher wattage than the hub, if you search it out. I didn't particularly get the controller for more sped- actually for more compatible connectors-

    but it's a great added bonus to have similar performance on BOTH hubs, with 22 amps when I'd definitely be getting less with a smaller 13 amp controller. As an old racing cyclist, I'm usually about staying minimal- now I've arrived at smaller battery packs but quite happy with a slightly larger controller I was originally bumming over- they're from Ebicycling I think the name is correct.
    peugeot electric.jpg
     
  7. bluck

    bluck Member

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    I specifically mention the SBP shift kit because if you know it can handle up to 72v on the controller. The engine is rated for 3000Watts. I have finished my electric bike build with the battery which I chose to be 52v 17.5ah. I get 36mph top speed on 3rd gear accelerates quick on 1st gear. I go to school and back 2 days before It shows the last bar on the battery. Its about 6-7 miles going and another 6-7 miles coming back. 2 hills are on my route and one long full throttle path. Lots of stops and goes in between. So im getting over 24miles of range and I haven't fully depleted the battery not even once which is perfect for me. Im thinking of increasing the gearing for 38mph top speed. The bike does great really good and light highly recommend I will post some pictures.
     
  8. bluck

    bluck Member

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  9. Tony01

    Tony01 Well-Known Member

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    So clean. Love the old school little headlight on the front. I saved this picture.
     
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  10. bluck

    bluck Member

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    Thanks I didnt expect it to come out this good. The front light is very bright and actually has a built in horn which is very loud. It is powered by the main battery turns on with a switch.
     
  11. Velodrome

    Velodrome Well-Known Member

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    VERY NICE !! Love the Yosh sticker :) What rear hub are you running? Nexis 3 speed?
     
  12. bluck

    bluck Member

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    Yeah dad debating on the sticker but it needed something ha. Im running a nexus 3 speed hub it's great im amazed on how quiet it is when coasting the freewheel does not click. It does when the chain starts to loosen though never had a hub this quiet.
     

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