E+ and Optibike Comparison

[Bike_on]

I was checking out the E+ systems web site and noticed this post about
the bike, from E+ guys:
------------------------------------------
The following speed and range table applies to 750W as well as 1000W
motors. Currently, we have three motor configurations - 750W motor is
speed limited to 20 mph, 750x motor will go around 24-26 mph and 1000W
will go to 30+ mph.

Speed                 Range
10mph (16 kph)   28-30 miles (~ 45-48 km)*
15mph (24 kph)   20 miles (~ 32 km)**
20mph (32 kph)  14-15 miles (~ 22 - 24 km)*
30mph (48 kph)    7-8 miles (~ 11 - 13 km)**

Both motors - 750W as well as 1000W currently produce the same torque
in the range of 80 - 85 Nm.

*Estimated (Numbers marked by * are current estimates and are in the
process of verification)
** These numbers are verified and tested on a Test Track by EMS.
---------------------------------------
Given a 9ahr, 36V, 324Whr NiMH battery, the Whr/mi would be:

Speed Range Whr/mi
10mph (16 kph) 28-30 miles (~ 45-48 km)* 11.6-10.8
15mph (24 kph) 20 miles (~ 32 km)** 16.2
20mph (32 kph) 14-15 miles (~ 22 - 24 km)* 23.1-21.6
30mph (48 kph) 7-8 miles (~ 11 - 13 km)** 46.3-40.5

For the Opti 800Li , 720Whr, (using my data only to estimate):
20mph 57 miles estimate 12.6
24mph 47 miles 15.3
30mph 25-30 miles estimate 28.8-24

These Opti number are with active pedalling.

Dan

[Jerome Daoust]

E+ scores points in my book for posting what seems to be realisting
ranges.

Yet, it confirms that if I went for an E+ I would have to consider an
auxiliary battery pack (an option to be available soon I heard) to
extend the range.

[deerfencer1]

Dan,

Thanks for posting this. I find the Opti numbers very useful and
interesting, especially the substantial differences in power
consumption at the varying speeds. We've always known that high speeds
= low efficiency, especially once you get up over 25 mph, but it's
good to see it quantified.

I think the E+ number may be without pedaling, so the Opti numbers
should be calculated the same way for this comparison to be accurate
IMO. I'm sure the Opti will still far outperform the E+ range-wise,
but this is not exactly a fair comparison as presented--unless I'm
mistaken re how E+ calculates their range.

Ideally we need to see some real ride reports from an E+ owner re
range, but I'd guess it's very close to the TF bikes. I average about
1.4 miles/Ah on most rides with active pedaling, or 21.6 Whr/mile,
which interestingly enough is exactly the lower end of the power
consumption range you have listed here for the E+ @ 20 mph, very close
to my every day average speed on most rides.


Larry


Jur

[deerfencer1]

Jerome,

Tidalforce did the same, at least in their manual where they published
the range could be as little as 8 miles in turbo X mode (1000W
motors).

LH

[OptOut]

Ok this gives me a goal for my next e+ test ride. I'll try to do a
real riding range estimate. But no promises. The last bike I tried was
not set up for my size and was very uncomfortable riding because the
handlebars were way down low on large semi-circular bars that would be
comfortable for a small casual upright or non-pedalling rider. I
wouldn't want to ride it more than a couple of miles.

Best,
Joe (mobile)

[Bike_on]

Larry-

To be fair to E+, I recently did an all electric ride ~ 24 miles, I
think I had another 6 miles in the battery, maybe more.

Thus: 720/30 = 24 Whr/mi at 24mph ave., 1.5 mi/ahr

I also had a good ride and ranout the battery on Sat.: 38 miles
720/38 = 19Whr/mi at 25+ mph, 1.9 mi/Ahr

Splitting the different for E+, at 25mph, expect 1.25 Ahr/mi.

Thus, the Opti is 1.5/1.25 -1 = 20% more efficient non-pedalling,
1.9/1.4 -1 = 35% more efficient under pedalling.

Of course, these are somewhat crude conjectures given different
riders, terrain, etc. We need dyno test data to proove it out.

Dan

[David]

Weight also needs to be kept constant. Comparing ride reports from
Keith, myself and Dan are going to be very different due to our
variations in girth (read: # of meatball sandwiches consumed per bike
ride).
As Larry pointed out with his recent battery reports, losing weight
helps a lot!

Just pointing out that it is difficult for us to compare the bikes
unless we have the same riders riding them...

-David

> > Dan- Hide quoted text -
>
> - Show quoted text -

[David]

Weight also needs to be kept constant. Comparing ride reports from
Keith, myself and Dan are going to be very different due to our
variations in girth (read: # of meatball sandwiches consumed per bike
ride).
As Larry pointed out with his recent battery reports, losing weight
helps a lot!

Just pointing out that it is difficult for us to compare the bikes
unless we have the same riders riding them...

-David
On Sep 18, 5:57 am, deerfencer1 <deerfenc...@aol.com> wrote: