Announcement

Collapse
No announcement yet.

How to choose a suitable kit for my bike?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    How to choose a suitable kit for my bike?

    Hello guys. I have seen the kits for bikes and unfortunately they are not very clear and do not clearly explain the performance you could get. If I want a bicycle to travel a daily distance from my house to work of 40 km round trip (unfortunately I live far away) at a decent speed (something like 35 km/h minimum) would I need a 12, 24 or 36 volt motor? 150, 250 or 300 W of power? And for a reasonable daily battery charge, how many amps should I have? Thanks.

    #2
    Originally posted by bikerocket View Post
    Hello guys. I have seen the kits for bikes and unfortunately they are not very clear and do not clearly explain the performance you could get. If I want a bicycle to travel a daily distance from my house to work of 40 km round trip (unfortunately I live far away) at a decent speed (something like 35 km/h minimum) would I need a 12, 24 or 36 volt motor? 150, 250 or 300 W of power? And for a reasonable daily battery charge, how many amps should I have? Thanks.
    There's little reason to consider anything less than a "48V" battery and system - the battery and motor are like heart and lungs and both need to be part of the discussion

    For 35kph, depending on the bike, you'll want likely closer to 500W as a minimum maximum power if reasonably level terrain, hills will change things a lot and more never hurts

    If we look at things conservatively and you are running 500W to do your 40km round trip in lets say 1:15 then you'd need a battery with >625Wh - maybe more like 750Wh to be conservative (Wh = watt-hour) so if a "48V" battery that would work out to 750Wh / 48V = 15.65Ah (Ah = amp-hour)... not unrealistic but in Li-ion not inexpensive either


    I have multiple batteries... one of my 12Ah @ 52V (I prefer 52V batteries over 48V and many 48V systems can accommodate 52V batteries) is about 625Wh and I can go 50km at a bit less than your target speed - more like 30kph​


    What part of Chile are you in? I spent several months there traveling in the 90's and really loved it - ¡Nacion muy rico y muy tranquilo, personas excellente!

    Comment


      #3
      You list all very tiny power numbers. I can only assume you have a tiny budget. There is a tiny kit within those power figures for a tiny budget, but to be helpful, you need to say how much you can spend and what bike you plan to put this on. You can go as far as you want by just getting a big enough battery. But they may not get to 35k/h unless on the down hill part. But it depends on your bike type and what you weigh. To for sure get speed and range, it wont be such a tiny budget. Then a premade bike could also be a fit for your needs. Some of those are really getting rather cheap compared to what they used to be.

      Comment


        #4
        Being willing or able to charge at work and home could change the requirements as well ... And the terrain ... And your total rolling weight ... An how much human power you plan on contributing.
        BBSHD / BBS02 IGH Builds: Nexus / Alfine 8: 1 2 3 4 5 6, Rohloff: 1

        Comment


          #5
          Originally posted by AZguy View Post
          What part of Chile are you in? I spent several months there traveling in the 90's and really loved it - ¡Nacion muy rico y muy tranquilo, personas excellente!
          AZguy I am from Santiago. Thanks for the comments, it is as you say.


          Comment


          • AZguy
            AZguy commented
            Editing a comment
            Santiago is brilliant, was sort of a base of operations during my walkabout there..the metro was awesome, people unbelievably warm, friendly and welcoming, night life fun and visiting all the nearby wineries and hiking the local terrain was a blast... Had found a hotel popular with the Israeli's that was inexpensive and close to the Plaza de Armas.. I could easily spend a lot of time there although the buses were crazy to try and figure out..

            I spent a fair bit of time in both Puerto Montt and Punta Arenas (both awesome) and many other places as I very slowly made my way to Tierra del Fuego over my months down south

            After returning to Santiago for a rest headed north up past La Serena and then back to Santiago


            I digress - good luck figuring out the electric bike, helpful folks here

          #6
          I will consider the comments received. Thank´s.

          Comment


            #7
            One thing I always ask foreign visitors to this US site, are there power or speed limits where you live. Many places have them. Then there is the question are they actually enforced? How severely.? He may be asking about smaller motors for a reason.

            Comment


            • Retrorockit
              Retrorockit commented
              Editing a comment
              Some peopel may just want an assisted bicycle so they can arrive at work fresh. Others may want more of a scooter experince. Age may be a factor in this too.

            • bikerocket
              bikerocket commented
              Editing a comment
              In santiago the speed seems to be something like 40 km/h. In week there are not many people with bike. I can´t say why, maybe it's not usual. Anyway I hope it changes.

            • Retrorockit
              Retrorockit commented
              Editing a comment
              Where I am 500-750W would be good for that except for the 20mph headwinds. Then more like 1000W to maintain speed.But it's a decent speed so you won't draw too much attention with a pretty powerful bike. Maybe a 750W BBS02 at 48V. When you go to 52V. a lot of the controllers aren't set up for that which complicates things. You probably won't be using the full 750W very much, but it will give better acceleration than a smaller motor..
              I've only run a 1500W motor, and battery size matters but IDK what would be right for that. 12Ah is typical. if you can recharge at work should be plenty.
          Working...
          X