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    Battery for 1000w 48v motor help

    Warning for a noob

    Hello, i need help to choose what battery i need for my ebike, the kit is 1000w 48v and i want to serie connect the batteries.
    it needs to be 48v and atleast 15ah.
    the kit is https://www.ebay.com/itm/112497011093?ul_noapp=true and Iam also wondering if this kit can handle 5 of these battries ( https://hobbyking.com/en_us/zippy-fl...-3s1p-20c.html )
    in total 55.5v and 15ah. The kit says 48v but if i switch the controller out it might work? can the motor itself handle more then 48v?

    I prefer the parts from hobbyking.com or any place that ship to Sweden and i want it to be as cheap as possible.

    Thanks

    #2
    I have a similar kit. 55.5v is fine for the motor, a fully charged 48v system can charge up to at least 54. As for the controller, you will have to find out if 55 volt will trip the over voltage protection. If it does, i think your options are to modify it or buy a higher voltage controller; but ive never checked how i would do that because 48v is fast enough for me.

    As for the battery, 14s1p is actually 3ah not 15ah. Amp hours do not increase with each battery in series, it increases with each battery in parrallel (Amp hours= cell rating x number of batteries in parallel). You can can calculate your total capacity in watts and then range( Watts= amp hours x voltage) ex: 55.5v x 3ah= 166.5wh --> 166.5wh / 20wpm(watts per mile)= 8.3 miles

    Problem is, that battery is rated to 20a and i think the 1000w kits pull 26a. Voltage sag would prevent you from getting even close to 8 miles.

    Just a disclaimer, keep in mind that i am a beginner not an expert, don't take my word about anything. Hope this helps

    Comment


      #3
      Originally posted by NewbieDeluxe View Post
      Warning for a noob

      Hello, i need help to choose what battery i need for my ebike, the kit is 1000w 48v and i want to serie connect the batteries.
      it needs to be 48v and atleast 15ah.
      the kit is https://www.ebay.com/itm/112497011093?ul_noapp=true and Iam also wondering if this kit can handle 5 of these battries ( https://hobbyking.com/en_us/zippy-fl...-3s1p-20c.html )
      in total 55.5v and 15ah. The kit says 48v but if i switch the controller out it might work? can the motor itself handle more then 48v?

      I prefer the parts from hobbyking.com or any place that ship to Sweden and i want it to be as cheap as possible.

      Thanks
      My 2 cents worth:
      Voltage:
      Those HK packs are 3s1p. While the nominal voltage of each cell is 3.7V, they are usually fully charged to 4.2V. The config you are considering would be 15s1p and fully charged would be over 60V. It's anybody's guess if your controller can handle that. Often 60v is the limit for the 48v controller. A standard "48V" ebike pack is 13s and a "52v" pack is 14s.

      Ah
      As mentioned above you do not add the capacity of each cell in the series to get total Ah. Only the groups in parallel. Therefore the 1p config you mention would have a 3Ah capacity. To get 15Ah, using these packs you would need 5 parallel strings.

      Chemistry
      Indeed, those RC Lipo packs are usually the least expensive and lightest. However, for safety reasons, more care needs to be taken in charging, balancing, etc. as they do not have a BMS built-in.

      Comment

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