hypermiling...the xtreme and cross way ;)

ghouluk

Esteemed Pedelecer
May 11, 2013
329
11
Hi all,

just thought i'd share my experiences of trying to max the milage out of a battery/pedal combination.....any comments or suggestions are welcome.

When i first got my first ebike (an ex-demo neo cross) the range was a disaster (<10km on a full battery) it turned out to be faulty, but peoples opinions on here seemed to be varied as to whether it was a fault or the environmentals. This got me curious, so once i'd picked up the xtreme in place of the faulty cross, i decided to do some tests (purely for interest and a good excuse for rides out)

As a benchmark, i did an eco run on the turbo trainer set to zero resistance, and recorded 75km before the battery died. I also stipulated normal routes i ride, no special treatment, my original goal was to break 100km on a single battery and pedal combination, that i achieved reasonably easily - so i set my sites on 200km

I'm running the standard 9ah battery on bh neo's (cross while the xtreme is in for repair) and on Sunday i almost hit my goal - to break the 200 km range on one battery. I got to 196km, but it died annoyingly right there...i think i would have made it on the xtreme, but the cross is a demo bike.

now bearing in mind that i'm a/heavy (100+kg) b/not the fittest c/am exceedingly stubborn d/ struggle with good cadence due to foot injury :) in my experience to maximise range

(1) max your tyre pressures - i run at 70psi, if i drop that down to 50psi, i lose a consistent 10-15% (might just be my weight making it so extreme.
(2) hills kill your battery (no **) but if you're going to go up them, turn the motor on before you leave the flat, and peddle steadily up the hill as smoothly as possible.
(3) switch off the motor when you aren't using it
(4) avoid using the brakes
(5) ride in hot weather :) not sure if this is bh only, but the batteries last quite a bit longer when its warm.
(6) non off road tyres - i get way more range since i changed to schwalbe big apples on the xtreme, its still got enough grip for tow paths and tracks (with a little bit of sliding) and the balloon tyres give a high psi/comfort compromise.

things that appear to make no real difference.

(1) locking out forks - i'd hoped for some improvement as i'd have thought the motor would be overcoming the suspension on a climb, but no noticable difference.
(2) non existent regen.
(3) carrying a rucksack or not

things that i'd like to try to make a real difference....

(1) well that 12ah battery would be a start, but still waiting for prices on it.
(2) hopefully one of you smart folks can help me out with some ideas that are neo-compatible?
 

Artstu

Esteemed Pedelecer
Aug 2, 2009
2,420
925
I'd like to see data on average speeds and altitude climbed etc? failing that a rough idea of the speeds and location of your rides.

I managed a whole 28 miles from my 400 wh's the other day.

Edit; 70 psi seems low to me, what tyres does your bike have? I'm thinking of changing the tyres on mine from the 700C X 40 to something lighter and quicker, probably a 32 section tyre.

Double edit; that's quite an amazing feat on a mountain bike http://www.bh-emotion.co.uk/bikes/neo/xtrem/
 
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ghouluk

Esteemed Pedelecer
May 11, 2013
329
11
so i've just made my strava public, as i finally worked out thats why i couldn't publish ride data, but in the process managed to ditch my old ride data.

average speed tends to be quite slow (around 20km/h on the xtreme, 22km/h on the cross for 30 mile rides) location is hampshire around the odiham area, steepest hill (i think) is a 17 percent, but i'm surrounded by long not very steep energy sapping hills (or bumps as my northern heritage would call them :) ).

I only use my battery on climbs, i used to work my down through the gears and then switch the motor on, but this gave me worse ranges than judging the hill as battery/not at the start, and then sticking to it.

I'll pull some strava data on the next ride and post it into the thread.

tyres on the xtreme are schwalbe big apples 2.0s (i switched away form the 2.35s as they were slllloowww)
tyres on the cross are whatever it shipped with (continentals i think)
 

Artstu

Esteemed Pedelecer
Aug 2, 2009
2,420
925
Thanks, I reread your post and spotted the tyres. I tend to ride on full power, that does mean I can't really share my rides on Strava as I tend to end up with about 5 KOM's on every ride I do :eek:
 

peerjay56

Esteemed Pedelecer
May 24, 2013
745
201
Nr Ingleton, N. Yorkshire
Hi all,

just thought i'd share my experiences of trying to max the milage out of a battery/pedal combination.....any comments or suggestions are welcome.

(5) ride in hot weather :) not sure if this is bh only, but the batteries last quite a bit longer when its warm.
I'm relatively new to ebikes, so haven't run my batteries in cooler conditions, but I do have a lot of experience with Segways which also run on lithium batteries (running tours) and temperature is definitely a factor - in 2 ways: range is reduced, and available power is also reduced. So not only do they not go as far, they also struggle to maintain output, when going upslope, for example. This usually manifests itself as reduced speed on slopes where in warmer weather, they are able to maintain the design top speed (20kph)

Good observations on increasing range though, thanks. I shall try to adopt some of these principles up here in the hilly dales!
 
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ghouluk

Esteemed Pedelecer
May 11, 2013
329
11
HEH! i love those off road segways.....! interesting about the batteries though!

so did some ride data today - average speed 13.4mph max speed 45mph distance 38.4 miles elevation gain 1582 ft max ele 559 ft

no battery segments used ;)