EN19154 power test gives incorrect and high values

[hoppy]

Did you make the motor from scratch, D8veh? I think it's the motor manufacturer who can set its continuous rated maximum power. If not, then the physical test applies.

 

[flecc]

Scientific curiosity (which I applaud) aside, Dmiall put it so simply and elegantly:

The tests are obviously designed to test the bikes on average conditions.

We don't have a problem with the EN assist speed tests. Clearly they are very easy to carry out and all bikes passing the speed test conform.

It's the results of the power testing that we challenge since they are so obviously nonsense and the testing methodology so questionable. Some of the accompanying statements apparently specify individual test conditions which are impossible in practice and anyway not called for by the test.

I'd say the regime is slack and probably deliberately designed to allow the "legal" power status quo to continue, little change from that which has existed for over 10 years now.

 

[trex]

I thought I read somewhere on the Wisper bikes website that on starting up, their motor will also reach 400+ Watts. 10mph results are interesting but should not be taken as proof that manufacturers try to compete unfairly.

 

[Deleted member 4366]

Sorted. The last line, which you can't quite see, says that it conforms to EN19154 so I must be OK now

 

[trex]

Your bike does not have CE (China Export) marking.

 

[Deleted member 4366]

Your bike does not have CE (China Export) marking.

Blast! I'll have to make another label, but I need to test it first. How does that go? Ah yes, I remember: You switch it off and if nothing happens for 5 mins it's a pass. Good. I'll go and sort it.

 

[Deleted member 4366]

Did you make the motor from scratch, D8veh? I think it's the motor manufacturer who can set its continuous rated maximum power. If not, then the physical test applies.

Surely it's the system power that counts. If the controller can only give 7 amps at 36v doesn't that mean that it conforms. I'm absolutely sure that many reputable ebike motors are nearly as poweful as mine given the right battery and controller.

 

[flecc]

I thought I read somewhere on the Wisper bikes website that on starting up, their motor will also reach 400+ Watts. 10mph results are interesting but should not be taken as proof that manufacturers try to compete unfairly.

Unfairly competing on power isn't an issue, no manufacturer does that. They all use sufficient power for e-bike purposes, which in hub motors happens to exceed the nominal amount allowed.

The reason there is no competition on power is that range is so important too. Each e-bike manufacturer makes a balance choice between power and range, a good system which gives customers the maximum choice.

For example, using two well known makes, if high power ability is important to me and I don't need very long range, the eZee models fit that bill well. If I'm prepared to sacrifice a little of that power for more range, the Wispers are a better choice.

If I want a really long range and am prepared to put in more effort to achieve that, a crank drive Panasonic unit powered bike is a good choice, since it's management takes care of achieving that for me.

 

[trex]

Would the right compromise be a good push bike on its own with added front wheel drive and behind the seat post 48V 9AH battery? It should be possible to reach 30-35mph on flat road and 15mph on 2%-4% hill?

 

[flecc]

Would the right compromise be a good push bike on its own with added front wheel drive and behind the seat post 48V 9AH battery? It should be possible to reach 30-35mph on flat road and 15mph on 2%-4% hill?

Not really, that formula is really too heavy for that cycling purpose, assuming you mean cyclist power to reach the high speeds and not an illegal motor.

 

[trex]

the bike alone weighs 10.9Kgs, battery 36V 10AH 3.9kgs or 48V 9AH 4.9kg + motor SWXK5 3 kgs total 18kgs or thereabout.

 

[flecc]

Sounds better with that light bike, but I still don't favour an SB motor for enabling 30 mph on the flat on cyclist power alone. That's an exceptional speed on the flat for most club cyclists on the lightest unpowered bikes, most of their riding done at nearer to 20 mph.

 

[trex]

would it still be legal if the front wheel motor is controlled by throttle and torque sensor?

Bike alone: Carrera TDF
Approximate Weight (KG): 10.9 kg with pedals
Brake Type: Caliper
Chainset: Shimano
Exact Frame Size: 58cm
Frame Colour: Black and Yellow
Frame Material: Aluminium
Frame Size: 58
Frame Size (cm): Over 57
Frame-: Lightweigh 6061 aluminium
Front Brake: Tektro Alloy caliper brake
Front Mech: Shimano FD-A050
Gear Shifters: Shimano ST-2300 16 speed
Gears: 16-20
Handle Bars: Alloy
Headset: Semi Integrated
Hubs: Alloy with alloy QR
Number of Gears: 16
Pedals: Road pedals with toe clips
Rear Brake: Tektro Alloy caliper brake
Rear Mech: Shimano RD-2300
Rims: Double wall alloy
Saddle: Carrera
Seatpost: Alloy 350mm x 27.2
Stem: 120mm
Tyre size: 700 x 23c
Tyres: Kenda road tyre
Wheel size: 700c

 

[flecc]

Yes at present in the UK since throttles are allowed even without pedelec override. The DfT have confirmed that existing throttle controlled bikes will remain legal after any change to pedelec only control.

 

[trex]

Thank you very much flecc.