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    Commuter Ebikes


    Hello, my name is Erik and I am currently building my fourth and fifth ebikes.

    I started with a Hilltopper Kit from Clean Republic, but 250W was not enough, so I built two ebikes with Crystalyte 4060 motors, Lyen Mark 2 controllers and 72V LiMn batteries from Electric Rider. Those ebikes were plenty powerful, but the motors got up to 107 degrees C after 5 miles, so my new builds have Cromotors. The Electric Rider batteries are not rated to supply continuous current above 50A because of the BMS so I am still up in the air as far as what batteries to use. With these batteries I have to limit my current in the CA to 45A and it definitely nerfs my bikes. On hard acceleration I can feel it cutting out because the controller is known to pull 81A if it is not limited. Before I limited the current to 45A I blew up two BMS units which is alarming on top of causing the ebike to be inoperable.

    I don't own a car. My commute to work is a flat paved 5.5 miles with plenty of stoplights. My second and third ebikes (I refer to them as prototypes) weigh about 75 lbs. each and I weigh 245 lbs. I don't carry too much cargo, but I use Surly Bud and Lou tires with a lot of tire liners and slime in the rear. As such, I consume a lot of current. I always run 72V (83.8V fully charged with a LVC of 65V). My rig requires 2880W to cruise at 36mph and I have drawn up to 81A on hard acceleration, so I am looking for a relatively lightweight 25-30Ah battery with a very beefy BMS that can supply 81A for up to 5s and a continuous 60A.

    I am completely obsessed with building ebikes. I work long hours to afford it, research at night and build on my few days off. I have a wonderful electronics tech, a superb wheel builder, a genius friend and a supportive LBS that works on the bicycle components. This is a challenging and rewarding hobby.
    Last edited by commuter ebikes; 02-18-2016, 11:54 PM.

    #2
    Hi! Where are you located?

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      #3
      Originally posted by BikeEV View Post
      Hi! Where are you located?
      I am in Sonoma County, CA, but I am known to drive up to 60 miles in any direction to meet up for a ride.

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        #4
        Cool. Nice to meet you!

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          #5
          Here is my buddy Frank trying out one of my bikes:
          Click image for larger version

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