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Voilamart eBike Conversion Kit Review

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The Voilamart ebike conversion kit – is it any good?

Voilamart are a global Chinese online retailer that sell everything from domestic appliances through to Beauty products. They also happen to sell budget ebike conversion kits. But just because they’re cheap doesn’t necessarily mean they aren’t any good.

The Voilamart 1000w ebike conversion kit represents excellent value for money, in this review I will go over the pros and cons, based on my own experience installing over 50 of these kits in the last 3 years.

What’s included in the Kit?

There are front and rear wheel kits available and a LCD display option. These kits contain almost everything you need to convert your bike to electric, apart from a battery.

voilamart 1000w 48v ebike conversion kit rear wheel

Voilamart rear wheel 48v 1000w ebike conversion kit (without LCD display)

  • 48v 1000w Rear wheel direct drive hub motor laced into a 26″ double-walled alloy rim with heavy-duty spokes
  • 48v 26A Motor controller
  • Controller Bag
  • Pedal assist sensor
  • Throttle with battery indicator display
  • Brake levers with cut-off sensors (for cable brakes only)
  • 7-Speed gear freewheel
  • 26″ x 1.75″ Mountain bike tire
  • Cable ties
  • Plastic wiring coil (for tidying up the cables)
  • Installation manual

Voilamart rear wheel 48v 1000w ebike conversion kit with LCD display

  • 48v 1000w Rear wheel direct drive hub motor laced into a 26″ double-walled alloy rim with heavy-duty spokes
  • 48v 26A motor controller
  • SW900 LCD Display
  • Controller Bag
  • Pedal assist sensor
  • Twist Throttle
  • Brake levers with cut-off sensors (for cable brakes only)
  • 7-Speed gear freewheel
  • 26″ x 1.75″ mountain bike tire
  • Cable ties
  • Plastic wiring coil (for tidying up the cables)
  • Installation manual

 

Motor Specification

The Voilamart kit uses a simple brushless DC direct drive hub motor. Direct drive motors have been around for years, and the principle is based on tried and tested technology. This kind of ebike motor may have seemed high-tech 20 years ago, but it is now considered old-hat when it comes to electric bike motors.

a voilamart 1000w ebike conversion kit fitted to a mountain bike

One benefit of direct drive hub motors, is they are cheap to manufacture, and fairly reliable. They do not have any internal moving parts (like geared hub motors) and they can generally handle quite a lot of power.

I have successfully run a 1000w Voilamart hub motor on a 45A controller with a 52v battery – producing over 2000w of peak power, with no reliability issues.

Legality

If you are in the UK, EU or Australia then the maximum continuous power output for an electric bicycle is 250w, with a speed limit of 15.5mph (25km/h) anything above that would be classed as a moped and subject to the same rules and regulations. You would only legally be able to ride your bike on private land.

This motor is rated at 1000w and is not speed limited. There is a plug on the controller, that when connected limits the output to 250w and speed to 15.5mph. I have looked into the law and it states quite clearly that the motor has to be ‘rated’ at 250w continuous.

US federal law is different and allows 750w and 20mph, so technically this motor would still be illegal there.

I’m not one for rules and regulations, but you need to be made aware of the potential legal implications before you purchase and install on of these kits.

Reliability

I have installed at least 50 of these kits over the last 3 years, and I have only ever had a couple of long-term issues reported off customers. Hall sensor failure has occurred on maybe 3 or 4 units, and I have had one controller failure, and one LCD display pack up.

Another issue you will encounter is broken spokes. If you here a ‘clicking’ sound when riding, you will need to check the spokes for tightness. If you need to replace a broken spoke, you will need the correct length and gauge. I would recommend buying a pack of spokes and a wheel truing stand, for ongoing maintenance.

bicycle wheel truing stand

Thankfully, because these kits are so cheap, so are the replacement components. The hall sensors can be replaced, if your are good with a soldering iron. The motor controller costs around £30 ($40) and the SW900 LCD display can be purchased off Aliexpress for about $50.

In my experience, Voilamart are quite helpful when it comes to warranty claims. The only issue being, the replacement part is usually sent from China, so delivery may take a little while.

What types of bike are best suited?

I would personally go for an old ChroMo steel mountain bike, or cruiser. Steel bends, alloy breaks! All older mountain bikes and cruisers have 26″ wheels. It would be advised to upgrade the brakes if possible, as these kits add a lot of weight to a bike once fitted.

A Vintage mountain bike fitted with a 1000w rear wheel ebike conversion kit

Installation and Compatibility

The Voilamart electric bike kit is only available in a 26″ wheel version, to my knowledge they do not supply any other size. This is probably to keep costs down and simplify things.

If your bike has disc brakes fitted, you could get away with fitting a smaller 26″ rear wheel to say, a 27.5″ wheeled mountain bike. I have done it before, without any negative impact on handling. This wouldn’t work with v-brakes, as the drop on the brake calipers would not reach the braking surface on the rim.

CHECK PRICE ON EBAY

The motor axle can sometimes be a tight squeeze to get into the dropouts. On occasion you may need to file the dropouts slightly to accommodate the larger axle.

Although the specification states that the kit is suitable for 135mm rear dropouts, you will nearly always have to pull them apart slightly to get the axle to fit in. You will also need to use the spacers provided, otherwise the rear brake caliper will rub on the motor hub casing.

Torque arm kit for electric bike hub motor

When you are indexing the rear gear shifting, you will need to set the ‘low’ limit screw on the rear derailleur, otherwise it will rub on the motor casing when in 1st gear (largest cog on the rear freewheel).

If you have hydraulic brakes, the brake levers supplied will not be compatible, so you will either need to purchase separate cut-off sensors or not bother at all. On a motor with this kind of power output, it would be wise to purchase the sensors (especially if you are using a throttle).

I would not recommend the front motor if you have disc brakes,  I have fitted a few of the front hub motors and the brake caliper nearly always rubs on the motor, regardless of adjustment.

This kit does not come with a torque-arm. I would highly recommend purchasing one of these, as it will prevent the motor axle from popping out of the dropouts. Something you definitely don’t want happening at speed!

Performance

When installed properly, these kits will turn your humble bicycle into quite a fast electric bike. I have recorded speeds of around 30mph on the flat (without pedalling). At the very least you will need a good 48v or 52v battery with a minimum continuous current rating of 30A – the controller will draw a maximum of 26A.

voilamart 48v 26a motor controller with wiring diagram

Another thing to consider is battery range. A direct drive hub motor is the least energy efficient electric bike motor, so you will not get a particularly good range out of something like a 48v 10.4Ah battery, unless you are really frugal with the power, and pedal a lot.

A good starting point for a battery would be a 48v 17.5Ah battery with a 30A BMS. This is going to be the most expensive part of the conversion. Of course, if you are only planning on using your bike for relatively short journeys then a 10Ah battery should be fine.

What if I run out of battery power?

Good luck pedalling! Direct drive hub motors are not only heavy, but you have the resistance of the motor to overcome. Pedalling one of these with the power off (particularly uphill) can be quite a challenge. I know, I’ve been in that position before! If you want a motor you can pedal comfortably with the electric assist off, then I would recommend a geared Bafang hub motor.

Conclusion

If you want to build a fast electric bike on a budget, then the Voilamart kit offers excellent value for money. It’s a simple, low-tech solution to building your own ebike. The motor is heavy and inefficient, but it will provide you with enough power to put a smile on your face, and it will get you up most hills with ease.

Factor in the cost of a medium-sized 48v battery, and you can build your bike for less than the price of the cheapest Chinese ebike.

 

These kits are generally reliable, more so than the more expensive Bafang mid-drive motors. If they do go wrong, everything is fairly cheap and easy to replace. You could even buy a second kit so you had a back-up of spare parts.

Just keep in mind the legal aspect. And most of all – ride safe! If you’re planning on using your creation on the road, try and keep your speed down in built-up areas, and always ghost pedal. That way you won’t draw any unwanted attention to yourself.

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Voilamart 1000w 48v ebike conversion kit

7

Value for Money

10.0/10

Performance

8.0/10

Efficiency

3.0/10

Pros

  • Excellent Value for Money
  • More than enough power
  • Fairly straightforward installation

Cons

  • Heavy
  • Inefficient
  • Antiquated

27 thoughts on “Voilamart eBike Conversion Kit Review

  • May 23, 2020 at 10:12 pm
    Permalink

    Hi there, I’ve recently purchased a Voilamart 1500w rear drive kit.. and I simply cannot get the thing to fire up at all. I purchased a 21amp battery, have wired everything up and getting no movement nor lights (on the throttle mounted display) at all. I’ve disconnected every component, and when I connect the only the positive and negative wires from the battery to the controller it appears that it is shorting out the battery, as the multi-meter reads 1.2 volts down from the initial 54 volts . I’ve removed the screws and slid the controller out of the housing to see if there was anything burnt out or popped (other than the positive wire for the light connection not being connected), but I have noticed that the major solder points on the PCB appear to have been resoldered (different finish and excess flux on only on those areas)… I’m waiting on a reply from the seller, but is there anything else that you might be able to suggest?

    Reply
    • May 25, 2020 at 9:48 am
      Permalink

      I’ve had a handful of issues with Voilamart controllers, either not working out of the box, or failing shortly after installation. I would personally recommend upgrading to a KT series controller (at least 48v 30A) and KT-LCD3 display. The KT controller’s use better quality MOSFET’s as well.

      Reply
  • May 21, 2020 at 8:36 pm
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    Hey on the 1500w kit the controller has a empty headlight led plug .. can I use that for anyheadlight or their one that I have to buy for that plug ?

    Reply
    • May 22, 2020 at 8:43 pm
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      Hi,

      I haven’t tried any headlights with the Voilamart kit, so can’t say which one will work correctly. You will ideally need one with a 36v / 48v output – like this one from Amazon.

      All the best,
      Tony

      Reply
  • May 20, 2020 at 3:08 am
    Permalink

    Value for Money

    0

    Performance

    3.5

    Efficiency

    0

    One more question: the efficiency is rated as poor… why is that? Is that inherent to all brushless hub motors?

    Thanks again!

    Reply
  • May 20, 2020 at 3:06 am
    Permalink

    There are three wires from the motor with bullet connectors: yellow, blue, blue-green. There are 3 corresponding wires from the controller: yellow, black, blue.
    I connected yellow to yellow, blue to blue, black to blue green. I haven’t connected the PAS to anything. Not getting any torque out so far.
    Is the pedal assist sensor required?
    What does the red button on the throttle/display do?
    I’m ready to roll! Will try to get crank off so I can install PAS. Thank you!

    Reply
    • May 20, 2020 at 8:39 am
      Permalink

      Hi Chris,
      The black wire coming from the controller is the battery negative wire and should not be connected to the green phase wire. There should be 3 corresponding phase wires on the controller yellow, blue and green that match the 3 phase wires coming from the motor.

      Double check and let me know.

      Regards,
      Tony

      Reply
      • May 21, 2020 at 5:52 pm
        Permalink

        Damn! Thank you! I must’ve been having an over-excited senior moment!
        Got the wiring corrected and now it works fine. (Funny how that happens)
        Now to test the range! 36V, 20Ah battery.
        Thanks again! You’re a life-saver!
        -Chris
        (I don’t believe in rating things till I’ve had a chance to use them a while, but for now, this seems pretty fun!)

        Reply
        • May 21, 2020 at 8:39 pm
          Permalink

          No worries, glad to help.

          All the best,
          Tont

          Reply
  • May 10, 2020 at 12:20 pm
    Permalink

    Hi Instead of using the throttle control supplied could I use a thumb type controller instead , I think I would prefer it this way .

    Reply
    • May 10, 2020 at 12:42 pm
      Permalink

      Yes, you can use a thumb throttle. I have fitted them before to Voilamart conversions. You need to make sure it has the same 3-pin block connector as your current throttle. Here is one on eBay that should do the trick (check the connector block in the photo).

      Cheers,
      Tony

      Reply
      • May 10, 2020 at 1:40 pm
        Permalink

        Thanks Tony , this one looks fine and a UK seller .
        My conversion kit is on its way so just a quick question the blue road legal cable will reduce you to 250w , so if I do not plug it in and it will be higher output.
        Obviously this is when I will be riding offroad !

        thanks
        Dave

        Reply
        • May 10, 2020 at 4:08 pm
          Permalink

          Yes, that’s correct. There’s 2 blue wires coming out of the controller (silver box) with a male and female connector. Plug them in and it limits the power output down to 250w.

          Reply
          • May 12, 2020 at 8:49 pm
            Permalink

            Sorry about all the questions , but will the kit come with connectors for attaching my battery to . Its hard to work out looking a just pictures . I have purchased a 48v 13ah battery but it doesnt show what connectors look like , hoping they are all standard .

            thanks
            Dave

          • May 13, 2020 at 8:07 am
            Permalink

            Hi Dave,

            The Voilamart kit use Male / Female bullet connectors for the positive and negative battery connection, whether or not they will correspond to the connectors on your battery is another matter. Sometimes you’ll find they correspond, but are either too big or small. What I usually do if this is the case is either solder and heat shrink the + – or change the connectors to something like an XT90. If the connectors fit, but are just a bit too big, you can crimp and use heat shrink.

            Regards,
            Tony

  • April 22, 2020 at 10:59 pm
    Permalink

    Value for Money

    10

    Performance

    0

    Efficiency

    0

    I have a vpower battery 48volts 26ah.
    How do I wire the battery to the controller ?

    Reply
    • April 23, 2020 at 8:38 pm
      Permalink

      You need to connect the positive (red) to the red (on the controller) and negative (black) to black on the controller. If your connectors are different, it would be worth using XT90 connectors due to the high output of your battery. The other alternative (if the connectors are not matching) is to solder and heat shrink the positive and negative wires, or use a ceramic block connector.

      Reply
      • April 23, 2020 at 9:52 pm
        Permalink

        Value for Money

        10

        Performance

        0

        Efficiency

        0

        Thank you. I’m operational now

        Reply
      • May 13, 2020 at 4:50 pm
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        hi what happens if I use the pas and throttle at the same time as I have no lcd screen

        Reply
        • May 13, 2020 at 6:42 pm
          Permalink

          Hi Kyle,

          You should be able to use the PAS and throttle simultaneously on the Voilmart. If you’ve got switchable power modes and you’re in level one, hitting the throttle will give you a boost.

          Reply
          • May 20, 2020 at 9:45 pm
            Permalink

            Value for Money

            10

            Performance

            10

            Efficiency

            10

            Hi
            I must say everything you’ve written in this article is 100% accurate. I have been usimg vialomart parts for the past 9 months. My first bike was an absolute beast.

            But I’ve built a 2nd bike with a brand new kit becaise my first bike got destroyed in a crash. The 2nd kit came with the SW900 parameters not set correctly. I’ve had several back and forth messages woth Violamart to get the correct settings only to realize that they are just doing branded drop shipping and they are very reluctant to contact the actual manufacturer to help me. I’ve been riding my new bike to work everyday now with the PAS level 1 running at 500-600W and levels 4 & 5 are useless because at level 3 the power max out. (It is a 48V kit). I’ve tried altering every parameter I can think of on the LCD but what I have now is the best I can get. I would be very grateful if you can check all the SW900 parameters of a 48V Violamart kit if you have one and share with me.

            I also have a 2nd question. Do you know how many Amps can the Lamp wires coming out of the controller can output? This controller is mot capable of responding to the SW900 lamp ON trigger (press and hold UP key). The controller constantly outputs 48V through the lamp wires from the moment the controller itswlf switches on. I habe added turning indicators, brake lights, front lights to my bike using HP tablet battery and step up buck converters. All my lights are 12V. I am planning on getting rid of this tablet battery and drawimg ppwer from the controller lamp wires to 48v to 12v 10A step down converter. But I am worried about the power limits of the controller’s 2 wires. Thanks so much for the article and in advance for your response.

          • May 21, 2020 at 11:39 pm
            Permalink

            Hi Kushan,

            I’ve had exactly the same issue with the Voilamart kit and SW900 display. I’ve tried changing the parameters (according to a thread on Endless-Sphere) but the amount of power always remains the same in levels 1-5. I managed to sort it out by purchasing a separate KT 48v 26A controller along with a KTLCD3 display – using this combination I could get the power levels to correspond to the assist.

            Regarding the light wire, I’m not sure of the output in amps, but I believe one of my old customers has been using lights with his (connected to the controller). I’ll try and get hold of him to find out what set-up he is using.

            All the best,
            Tony

          • May 25, 2020 at 10:46 pm
            Permalink

            Hi Tony

            Thanks for the reply. How I’ve managed to get some difference in PAS level 1-3 on SW900 is by changing the number of speed magnets to 50. On the Ebikeling.com website there is a manual for the parameters in which they say that it’s 47 for direct drive motors. And I’ve read on a few forums that it’s 48. But I opened the Violamart motor and counted 50 neodymium magnets. Since i entered 50 in the SW900, I’ve got some difference between levels. It’s not perfect but if you would like to get some use of your old SW900 and the controller, you can with this method.

          • May 26, 2020 at 7:39 am
            Permalink

            Hi Kushan,

            Thanks for sharing, that’s really useful to know. Much appreciated.

            All the best,
            Tony

  • February 15, 2020 at 10:23 pm
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    Olá tive um problema meu painel não quer mostrar meu consumo de energia aquele que aparece em baixo para que eu controle minha bateria durante o dia ! E a velocidade também está instável não aparenta estar certa tem solução para isso ?

    Reply
    • February 16, 2020 at 1:06 pm
      Permalink

      Olá, Parece que seu painel de exibição pode precisar ser configurado. Você sabe qual é o seu painel de exibição – é o SW900 ou o KT-LCD3? Se o parâmetro de voltagem da bateria estiver definido incorretamente, o indicador da bateria não funcionará. A medição da velocidade é feita internamente usando o número de ímãs no motor – se essa configuração estiver incorreta, você obterá uma leitura falsa da velocidade. Deixe-me saber qual tela você possui e enviarei um link para as configurações e como alterá-las. Atenciosamente, Tony

      Reply

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