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  1. #1
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    bakfets nl cargo bike needs electric power what should I get ? help

    Hi I need advice. I have a bakfits nl long cargo bike and would love some type of electric power. My use for the bike is tool transportation mainly as I am a carpenter. I commute around 10 Miles each way over some hilly areas and some flat. I don't feel I need re genetrave braking as I'm not stuck for charge point s. I would like to have reasonable power for the hilly parts as my tools are heavy. And would like to be able to carry an extra battery for weekend camping trips.
    Last and most important thing I live in a very wet part of the uk and want a kit that can take the rain snow and sun all in one day and the next. So if any one has advice on a kit suitable for my bike and me I would love to hear what you think will suit. I have never purchased a e bike kit and I'm struggling with the choice available

    Regards Ian

  2. #2
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    How much do you want to spend?... Can you do the install yourself?... Can you repair it yourself?...
    He uses statistics as a drunken man uses lamp-posts...for support rather than illumination. I do like my beer, so sometimes I do end up leaning on the lamp-post...

  3. #3
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    You might consider the Stoke Monkey kit (ebikesca) which seems designed for cargo bikes. My main suggestion is to avoid Dillinger like the plague. I made the mistake of purchasing one of their kits and it stopped working after two weeks. So far they have shown little interest is assisting me.

  4. #4
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    For hill climbing, one of these, they also come with bigger motors, 1,200w and 1,400w... HPC Mid Drive Conversion System (Custom Bafang 8fun BBS02) - Hi-Power Cycles
    He uses statistics as a drunken man uses lamp-posts...for support rather than illumination. I do like my beer, so sometimes I do end up leaning on the lamp-post...

  5. #5
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    Thanks for your reply. So I have looked in to mid drive systems and they seem to have fantastic advantages over hub systems. However as my backfets has a rather large tube running forwards horizontally from the bottom bracket I have been un able to find a mid drive that won't sit to low on my bike and become a hazard. After some reaserch on my bike I have found a pair of bespoke front forks that can accommodate disc brakes. This will solve one big obstacle. And leaving the rear wheel and gears untouched. I am inclined to go with a front hub system for that reason. Less Modifications mean In the event of some kind of brake down I can just put on the old wheel. But I still find my self lost as in what brand/type to get

  6. #6
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    Hi thanks for your reply. So ebikes. I will look in to them. Is the stoke monkey kit designed for heavy loads or just any ebikes kit?. Also have you used one your self and if so what's your thoughts is it strong Long lasting ect. I noticed the moters are reasonable priced does this in any way reflect on buld quality ?

  7. #7
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    So price I'm not rich or silly with money. I'm prepared to spend the cash on a kit that will last years I don't want a cheep kit that will let me down. Install yes I'm a master craftsman and love the thought of the day I sit down to fit my chosen kit. And as far as maintenance I have a good friend who is good with electronics and a list of mechanical engineers to call on for help

  8. #8
    coprolite fietsbob's Avatar
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    Regen is only a slight input as you brake , it's not a substitute for recharging, that would be a perpetual motion machine and the laws of Physics wont let that happen.

    If you dont have a Mains plug in, add a Honda motor-generator to your Load . you can run that on the jobsite , run some saws and such off it too..



    stoke monkey and a tandem crossover crankset is good , but they were made for Longtail Bikes: Surly Big dummy,Xtracycle edgerunner,
    not a BakFiets .. DK Long John, or Bullitt

    unless you get yours Custom Modified by a Frame builder , to crate the Motor-mount they Lack.. for the left side drive chain.

    BTW in-hub motors are more flatland, speed, limited to 20mph, Low torque .. so climbing is more limited..

    Stoke Monkey uses the whole Drivetrain gear range on the right side.. that is how it has the climbing power, low gears.
    Last edited by fietsbob; 10-22-14 at 02:13 PM.

  9. #9
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    Thankyou for your reply. Yes your right about regenerative braking and the stoke monkey. But what should I do the more I learn about it all the more I think front hub. Would you agree? And if so what type brand battery voltage amp ect. Or is there something I have not thought of yet? I know its a lot of questions but I'm confused at what to choose. ��

  10. #10
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    It would help if we knew your location. For instance, if you're in Canada, ebikes.ca and ypedal have as good a reputation as anyone in the industry. Ebikekit (PA) is very good in the USA. I tried a front hub kit in order to balance the weight of motor and battery (water bottle) and the bike rides fine (or did - see above). Recently, I purchased a YESCOMUSA 1000w, 48V kit on ebay (just put 48V, 1000w into the browser) for $250 and I'm amazed by the apparent quality and the fact that I need only a battery to get started (waiting for a new bike frame). This type of motor and a 48V or 72V battery would be a good system. Many riders report years of service with this.

  11. #11
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    Sorry I'm in Scotland. That sounds very interesting I will do some research and see if it fits my needs. Thanks

  12. #12
    7ft of Cet-Bak Nightdiver's Avatar
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    I'd give ebikes.ca a call and discuss things with them. I've seen several "Stoked" long-john bikes (Cetma, Bakfiets, etc), all of which were mounted via brackets. Now that Grin (ebikes.ca) has taken over the Stokemonkey, I gather they would be able to sort you out for your mounting. One thing to consider is the ability to sufficiently brake while going down hills that electric boost has allowed you to ascend. I believe this was grounds for discouraging mounting on Bakfiets by Clever Cycles (originator of Stokemonkey), although perhaps it was the high-speed handling since they included other long-johns in their warning. Good luck, and hope to see you post back once you've settled on a direction.

  13. #13
    coprolite fietsbob's Avatar
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    I learn about it all the more I think front hub. Would you agree?
    probably so , and relatively simpler . the torque to wheel diameter may be better with a smaller wheel with the same motorhub.

    I DK any specifics , most sources are Asian anyhow for motors , & battery shipping by Air is expensive, so Id shop within the UK for that.

  14. #14
    Junior Member velomoover's Avatar
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    Quote Originally Posted by bakfets View Post
    So price I'm not rich or silly with money. I'm prepared to spend the cash on a kit that will last years I don't want a cheep kit that will let me down. Install yes I'm a master craftsman and love the thought of the day I sit down to fit my chosen kit. And as far as maintenance I have a good friend who is good with electronics and a list of mechanical engineers to call on for help
    Is it possible to weld together (join the shafts) of two 1/2 hp washing machine motors(universal brushed motors not brushless), then have a 2000 watt 12v to 120 volt inverter connected to a cheap variac for speed (voltage) control? then use a couple of lead acid batteries in parallel? a variac is only like 80 or 90 dollars, inverter maybe another 100, plus some salvaged batteries. and motors.

    I've seen people giving away washing machines because they "wont work" because of some timer issue, pop-up campers/caravans sometimes come with heavy-duty power inverters and they get scrapped with the camper. and perhaps you could pick up a used variac on ebay for cheap. the rest would be wiring, welding and batteries.


    Thats like 5 foot/lbs of torque at 1500 rpm? thats more than a small gas motor. about 750 watts in brushed motor form? The motors would need a rectifier in line to convert the AC to DC for more efficient operation but I think that would be a cool project with a "mad max" aesthetic . correct me if im wrong.

    100 amp/hr battery would net perhaps 1000 watts for an hour if lucky?
    Last edited by velomoover; 10-23-14 at 10:53 PM.
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