Whether justified or not, drivers are afraid that their electric vehicles might run out of juice in the middle of the road. Actually, the possibility of building electric cars with unlimited range already exists: via inductive charging.

Wireless charging, also known as inductive charging or wireless energy transfer, could help electric mobility to make a breakthrough. Many car manufacturers and suppliers, but also research institutes and start-ups are currently working on this technology.

Review Physics Lesson

Most of us are familiar with the principle of inductive charging from the household, from electric toothbrushes, to induction stoves and mobile phones. An object is supplied with power without cables. In fact, this is a wireless near-field power transmission.

Flashback to physics class.

Near-field means: the transmission of energy is carried out via a magnetic flux and differs from transmission in the far-field, which is based on electromagnetic waves (see light and radio technology).

But back to inductive charging. The whole system works by means of two coils positioned at a certain distance from each other. Coil number 1 generates a magnetic field by current. This magnetic field ensures that coil number 2, or the “pickup,” can take this current. The current is thus induced.

Old technology, new approach

Now, you might be asking: wait a minute, if we know all this from physics lessons, what is so innovative about it?

The question is not unjustified. The principle of induction was finally discovered 200 years ago by the British scientist Michael Faraday.

The scientist Nikola Tesla (born in what is now Croatia) is also often referred to as a pioneer of this discipline since he invested a great deal of money in technology at the beginning of the 20th century. But he never made the breakthrough and was quickly forgotten. Until a certain Elon Musk started using his name and visions for himself.

But while Nikola Tesla tried to induce electricity from the earth’s atmosphere with huge towers of ions and electrons, today’s approaches to electro-mobility are more down-to-earth – in the truest sense of the word. Scientists, car manufacturers and suppliers are working mainly on two methods of induction: inductive charging via stationary pads and inductive charging while driving across the road.

The charging plate with the paw sensor

In order for the wireless charging of electric cars to work, the vehicles must have a coil in the underbody, typically in the front axle area. Why right there? To ensure that the distance to the charging station (on the road or on the garage floor) is as small as possible. The closer the two coils are to each other, the more efficiently the energy transfer works. For an electric car like the BMW i3, this means that the ideal distance between the two coils is 100 to 140 millimeters.

BMW in particular relies on this technology and is currently using it in all its i-series vehicles, albeit still in the prototype stage. BMW is working with Qualcomm, a chip manufacturer from the USA. In Formula E, the technology is already being used for pace cars or safety cars.

The pallet Qualcomm has developed for Formula E and will soon be made available to the mass market is called “Halo,” which works in any wind and weather and also incorporates a Foreign Object Detection feature. This is a safety sensor that can detect foreign objects – from the paper clip to the dog’s paw – and then automatically interrupts the charging process.

The first models with induction charging technology from German car makers, including BMW and Audi, are to be launched on the market in 2018. Finding public charging pads and the charging itself could be done via the smartphone or a special chip card.

Snack charges of everyday life

Sweden is already one step ahead. Volvo has already successfully completed the development of such a charging pad. The garage pad is to be included with the Volvo C30 Electric to make charging quicker and easier. Some models will be able to charge the battery fully by induction in up to one hour. With the E-Smart, charging could even take as little as 45 minutes.

The idea of the loading pads is not only intended for the domestic garage, but also for charging while parked. For example, the electric car could be charged while you are shopping or sitting in the waiting room at the doctor’s office. It is precisely this bit by bit charging, the “snack charging,” that is supposed to be better for the battery. Audi employee Björn Elias says: “The short cycles are the best thing that can happen to the battery: the lower the charging thrust, the longer the life expectancy” – this may sound good from the point of view of a car manufacturer who is betting on induction charging for electric cars. In fact, opinions on whether this is true or not differ somewhat.

However, one thing is certain: unlike the superchargers, short charging cycles do not damage the service life of the batteries.

Early tests show that charging while driving works

While car manufacturers are concentrating on the charge pads, various research institutes, as well as governments and start-ups, are working to enable inductive charging on the road while driving.

For example, the Fraunhofer Institute for Manufacturing Technology and Applied Materials Research (IFAM) in Bremen has built an electric sports car in which the battery is charged while driving. Artega 1 is the model, with 424 hp. The Artega 1 was driven for the first time in 2015, at 30 kilometers per hour on a 25-meter test track. Coils for charging were installed in the roadway. In their test, the researchers successfully demonstrated how the electric sports car could be harged while driving.

But of course, this is only the beginning. The aim is to be able to use the technology at full speed. This dynamic induction requires that the installed coils be switched on and off in the correct rhythm. For the method to be used nationwide, the entire road infrastructure would have to be converted.

Not cheap, but not too expensive, says Felix Horch, head of the Electric Drives department at IFAM: “The construction of a motorway kilometer would be more expensive overall thanks to induction technology, but the costs would certainly not multiply. It’s a fundamental infrastructure decision: at some point in time, it was decided to electrify the railway network.”

England’s example shows that this could well be a sustainable project. Highways England, the state motorway operator, is considering testing the method on an electric highway for 18 months.

In France, Renault and Qualcomm have also demonstrated that charging can work while driving.

Earn money with “solar streets”

But why not rely on solar energy for dynamic inductive charging? The Potsdam-based start-up Solmove is working on this. With the concept of a solar street, the company wants to use the streets in two ways.

This means that existing traffic routes can be upgraded with stable photovoltaic modules and thus not only electric cars, but also e-bikes and even trains can be charged. In addition, the electricity generated in this way could also be fed into the municipal energy grid. Cities could earn money from it and thus finance the rehabilitation of their roads. This, at least, is Solmove’s idea.

However, the solar roads must be horizontal surfaces. Solmove says that in Germany, 1,400 km² are still suitable for this purpose. This could supply 20,000,000,000 cars with electricity.

Large buses, small batteries

Tel Aviv already has the world’s first electric road. The Israeli start-up ElectRoad is testing these mainly for public transport. The theory: induction charging makes it possible to operate the large buses with smaller and lighter batteries. That could save a lot of money.

In Germany, too, there are some early projects in public transport with wireless charging, but not for charging during the journey. Rather, they rely on charging pads. For example, the electric buses in Braunschweig, “Emil” (short for “electro-mobility by means of inductive charge”) have been using induction technology to charge their fleets for several years now.

Inductive charging for electric buses has also began being tested in Berlin in 2015.

The clear advantage: endless range

But why all the trouble? What does inductive charging offer that charging with cables doesn’t?

First of all, wireless charging is more convenient for users. You don’t have to handle cables in a cumbersome way. In addition, in some cases, inductive charging is up to 85 times faster than charging via the home socket.

If we look at inductive charging while driving, the advantage is obvious. If the car can recharge while driving, the electric vehicle theoretically has an unlimited range.

In fact, the development of this technology is a bit more challenging than the charge pads. Finally, it must be ensured that the coils switch on and off at the correct distance. And all this at full speed, at different speeds. In addition, it must of course also be ensured that the magnetic field on the roadway is harmless to humans and animals.

An alternative to the ground coils could be inductive charging via overhead lines. Siemens wants to implement this on motorways for trucks – a world first. The Group has been awarded the contract for the construction of such an e-motorway for test purposes by the relevant authorities in California. While this can still be reasonably imagined for trucks, it is unlikely that car manufacturers will suddenly build models with pantographs on the roof.

It is therefore interesting to see which forms of inductive charging will be used in the future. But Thomas Nindl of Qualcomm’s Munich office is probably right about one thing:”Our children will lose the word ‘refuel’ from their vocabulary.”

The basic principle is always the same for all electric longboards: moving and braking are done using a remote control which is connected to the control unit and the motor under the board via Bluetooth. The Mellow Board Surfer does not differ very much from its competitors.

Features

Included in delivery is the fully configured board including motor, battery pack, remote control, wrist strap and charging cable. Why “fully configured”? Because Mellow Boards also offer a set to convert any longboard or skateboard into an electric board. This is called Mellow Drive.

But we are mainly interested in the Mellow Board Surfer. Let ‘s take a look at the important data and facts – all important specs are listed here:

* Quick charge possible: 45 minutes

Mellow Board: Replaceable battery pack

€ 2,000 for an electric skateboard is quite a lot – and 400 euros more than the electric board from Boosted. The Mellow Board Surfer offers some advantages – for example, the distance it can reach is almost twice as great.

The Mellow Board divided into its individual parts (Screenshot: Mellow Boards)

In addition, the battery pack can be replaced within 30 seconds and without tools. With a replacement battery and a large power bank, you could then reach almost 45 kilometers (after 15 km, put first battery pack in your backpack and recharge by Powerbank, use the second rechargeable battery pack then after 30 km, the first battery pack is ready to go again).

Mellow Board Surfer: Easy and fast

In addition, the Mellow Board Surfer is significantly lighter (6.8 kg vs. 3.9 kg). This is noticeable during transportation, although the Boosted Board is more protected. The 5 additional km / h top speed is not important. You’d have to be a little crazy to go the top speed of 40 km / h anyway.

The battery pack in the Mellow Board Surfer is changed quickly

However, the Mellow Board Surfer does not do as well with bumpy surfaces – it is significantly stiffer. So, you tend to feel the bumps more. In terms of appearance, the light blue of the board looks funky, cool and summery, but at the same time, it also looks cheap – like a toy.

The steering takes getting used to

The rubber covers on the battery pack, which can prevent water from entering the charging port and dust from getting into the remote control, are so solid in our test we could not get them out without tools. On the one hand, this creates a high degree protection, but it is also enormously annoying.

The remote control does not offer as much control as the small wheel of the Boosted board. Here, Mellow Board has used a sliding mechanism that seems less precise and requires more getting used to.

The Mellow Board Surfer pushes the entire remote control forward or backward

A responsible product

However, Mellow Boards show much more of a sense of responsibility than others in one way: the pro-mode can only be activated after 30 kilometers of distance traveled.

For someone who could not sleep for several nights because of injuries from trying out electric longboards, this is great! However, for professionals, this could be annoying.

By the way, the distance, modes and other features can be adjusted by means of an easy-to-use app. Very nice.

The 80 mm wheels on the Mellow Board Surfer are light blue – a difficult color

The ride experience

But now about the ride experience. Here, the Mellow Board proves mediocre – for several small reasons which significantly reduce the pleasure of driving. You feel super safe on the board, the deck has a comfortable size, the grip is great and the acceleration is very precisely adapted to the individual modes.

But: you always have to push the board to be able to start it. According to Mellow Boards, this protects the battery and makes it safer. This may be true, but it’s no fun. This is like having to push your Tesla before it starts. Sure, we’re just talking about a few steps, but it’s still annoying.

This is especially true when maneuvering. For example, if you want to take tight corners or avoid obstacles. Also, the Mellow Board can’t reverse. So, if you want to turn around, you have to get off and turn the board by hand.

The battery is big, but not very heavy

Conclusion: Big price for high performance

At € 2,000, the Mellow Board Surfer is on the pricey side compared to other electric longboards. This can be seen as a result of factors such as its range, weight and modular design. In terms of how fun it is, it still leaves some to be desired, but this could be improved with small adjustments by the manufacturer.

If you want to convert your current longboard, you will find in the Mellow-Shop the modular pack for € 1,699, an additional battery pack (which you do not need for distances up to 15 kilometers) is € 249, and there is another minor variant, the Mellow Board Cruiser, for just under € 2,000.

Further information and purchase options are available on the Mellow Boards website.

The electric Boosted board has gained a lot of popularity through its appearance in numerous videos of Internet-famous users such as Casey Neistat and Jesse Michael Wellens.

The remote control feels good in the hand, the board feels safe – then off you go like Casey Neistat through New York City traffic. That is how it is supposed to work theory. As simple as it looks for YouTube star and media entrepreneur Neistat, it is unfortunately not so simple for the rest of us. But from the beginning.

Once you have cut through all the unwieldy cardboard packaging, you find the completely assembled board, a charger (attention: the USA-Germany adapter is not included!), a Bluetooth remote control with wrist strap and USB charger and a simple, illustrated and appealing instruction manual.

The Boosted Board: What you get (Image: Boosted)

Differences: Boosted Board Dual vs. Dual +

We tested the Dual + version. The differences between it and the normal dual board are 200 US dollars, 500 watts, 3 km / h top speed, 5 degrees slope and an extra grip surface (grip tape). Here is an overview of all the important specs:

Whether the extra $200 is worth it you must decide for yourself. With ability to handle 20 percent grade hills, you can get loose, the extra 3 km / h is not a big deal, and the extra rough grip tape on the Dual + is almost too rough for your fingers.

The deck of the boosted board with the extra-rough grip tape (in the dual + version).

Boosted Board: How Did Casey Neistat Make It Through NYC?

But now to the interesting part: can a moderately talented skateboarder (having ridden a skateboard a few times for a few kilometers, minimal obstacles, two basic tricks) handle the boosted board (which is actually classified as a longboard) and dodge the masses, road traffic and buses?

Yes and no. Yes, because it is possible with enough practice. No, because it is forbidden in Germany. So you are confined to paths, little-used streets in front of the house and private property. That’s it for the electric skateboarding romance. Nevertheless, this does not mean that the Boosted Board offers no potential for fun.

Gravel and manholes etc. are tough on the board. The 2nd generation is much more robust than the Boosted boards of the 1st generation

The Bluetooth remote control accelerates the board

So off to side streets. Here, I am on three kilometers of straight, well paved road with a gentle slope. My first attempts do not look very professional. Ever seen a beginner on ice skates? This is roughly what it’s like – except without the help of a wall to grab on to when you start falling.

Under wobbly knees and swinging arms, the board moves forward – with a creeping, jerky movement. And yet you get the hang of it relatively quickly. The speed can be controlled with a small wheel on the remote control, which is connected via Bluetooth to the control unit under the boosted board.

Battery indicator, modes, acceleration and brake

Forward – and the board goes forward; backwards and the board brakes. Once it’s not moving, you can also go backwards. When you go downhill the battery even recharges– not very much, but it’s still something.

But in order for something to happen at all, the small Engage button (the button under the Boosted logo on the picture) has to be pressed. If you get off the board and release the remote control, the board does not just continue. In addition, the wheels always jump back to the original position.

The engine sits behind the Boosted Board and drives the wheels. Connections under the grip tape link it to the battery at the front.

Boosted Board Dual +: 35 km / h speed

In the four different modes – from the beginner to the pro – you can vary the intensity and the maximum speed the boosted board can reach. For beginners, the beginner mode is absolutely recommended. There is no room for false pride: whoever goes too fast too soon will get hurt, with certainty.

You can switch between the modes either with the remote control or via a smartphone app. The app also offers a few statistics (distance, range, etc.). In Pro mode, the Boosted Board Dual + can go 35 km / h.

The battery is huge and sits at the front of the board. It alone weighs just 2 kg.

Boosted Board: a few weeds, falling, bloody back

In the car, 35 km / h is almost nothing, but imagine this speed when you are standing up with no support, only a few centimeters above the ground on a skateboard. The 35 km / h were never reached in the test – at about 25 km / h II cut things off – it was too fast and too dangerous, even with a helmet.

Whoever is on the Boosted Board for the first time should not be on the road. You hit one clump of grass and you’ll fall and roll a few times on the asphalt. Both hands and both knees scraped up and back bloody, pants torn.

Accordingly, protective clothing is an absolute must! Not only a helmet, but hopefully also knee, elbow and wrist pads.

The 80 mm wheels on the boosted board are bright orange – at least until the first ride

Conclusion about the Boosted Board: Fun, very dangerous, and lots of money

Otherwise, the boosted board makes for a crazy-good time. It can go 11 km before being recharged, while there is also an “Extended Battery” with double the range that will soon be available (from Q4 / 2017). The board is made of bamboo wood that can be bent almost to the ground – breaking  it is almost impossible.

The Boosted Board is also modular in design – but it takes tools and a little skill to exchange parts. Spare parts are available in the shop – also for a lot of money. In summary, the Boosted Board offers great fun, a lot of risk and costs a lot of money.

1,400 to 1,600 dollars is a lot of money for a toy. As a means of transport it would be okay – but here the relevant laws in Germany limit its use. You can order a Boosted Board here – shipping to Germany is included.