Watts required for 50 MPH on a 90 lb ebike

EbikeMaui · May 28, 2007

To get a 90 lb bike to 50 MPH it takes about 3500 watts of power. Batteries won't last vary long at that rate.A 5% grade adds another 1000 watts. But that 4500 watts is at 100% efficiency.What is the efficiency of a 1000 watt motor using 4500 watts :?:

I suspect it would be 30% efficient or less efficient. = requiring a total of about 15,000 watts out to complete the task.
http://www.kreuzotter.de/english/espeed.htm

Lowell · May 28, 2007

In my videos you can see that my bike can cruise at 50mph with less than 3000W INPUT power.

This bike might require 15kW of power to match my bike.... right before the motor smokes.

TylerDurden · May 28, 2007

EbikeMaui said:
Batteries won't last vary long at that rate.

Wouldn't that depend on how many?

:?:

EbikeMaui · May 28, 2007

TylerDurden said:
EbikeMaui said:

Batteries won't last vary long at that rate.

Click to expand...

Wouldn't that depend on how many?

How many watts worth of batteries can you carry on a ebike totaling 75 lbs including a 25 lb hub motor and batteries. :?:

TylerDurden · May 28, 2007

Well since the topic is about a 90lb bike...

-25 = 65 (motor)
-25 = 40 (bike)

my 3ah 24v batts weigh 2.2lbs ea.

1300Wh?

:?:

Lowell · May 28, 2007

Nearly 2000Wh of Emolis should fit in a 40lb package.

TylerDurden · May 28, 2007

Lowell said:
Nearly 2000Wh of Emolis should fit in a 40lb package.

I should think so... mine are still in the Ridgid cases.

Lowell · May 28, 2007

My first four V28 packs just arrived in Vancouver and I will be removing the cells and weighing them soon. I'm going to make an exact Wh/kg prediction on completed DIY packs taking into account tabs and packaging and it will hopefully be over 100Wh/kg. My NiMH packs are around 72Wh/kg.

xyster · May 29, 2007

The emoli cells are almost exactly 100 grams per, making weight calculations easy.

Here's an excellent pack-breakdown tutorial and cell review:
http://www.rcgroups.com/forums/showthread.php?t=508443

safe · Sep 3, 2007

EbikeMaui said:
To get a 90 lb bike to 50 MPH it takes about 3500 watts of power.

For the ultra streamlined "White Hawk" it only takes 354 watts.

Aerodynamics is everything... 8)

CGameProgrammer · Sep 3, 2007

Why'd you resurrect a four-month-old thread? And an EBikeMaui one nonetheless. This thread should be locked.

xyster · Sep 3, 2007

CGameProgrammer said:
Why'd you resurrect a four-month-old thread? And an EBikeMaui one nonetheless. This thread should be locked.

I second both the question and the assertion.

Watts required for 50 MPH on a 90 lb ebike

EbikeMaui

1 kW

Lowell

100 kW

TylerDurden

100 GW

EbikeMaui

1 kW

TylerDurden

100 GW

Lowell

100 kW

TylerDurden

100 GW

Lowell

100 kW

xyster

10 MW

safe

1 GW

CGameProgrammer

10 kW

xyster

10 MW

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