Hi
Doesn’t sound right
I average around 35 -40 pure off road miles between eco and tour with around 3800 ft of climbing still with last segment on battery meter how much is left I don’t know as I’ve never flattened it
I have read thou that some are moaning about emtb mode sucking more out of the battery but I can’t comment as I don’t have it
Have you tried it in eco to see how it compares with not much climbing
They're interesting statistics. Let's do some maths:
to lift 1N 1m it takes 1 joule of energy, so to lift 100kg 3800ft takes
100 x 9.81 x 1158 Joules = 1,135,998 Joules, which is 316 watt-hours
The battery conversion to motive power is about 0.7 (optimistic) efficient when you add controller losses, motor losses and drive-train losses, so the battery would have to supply 451 wh for just the climbing, and only on a smooth surface. Any rough stuff and that would go up substantially. I would guess that most of the time going down-hill, the battery wouldn't need to supply any power. On the flat on eco setting, I'd estimate about 50w, so that works out (with a 500wh battery) one hour riding on the flat to add to the hill-climbing.
None of that includes the power you add yourself by pedalling, but neither does it include all the wind resistance losses and friction/rolling resistance losses, which added together are probably equivalent to your pedal power.
To summarise, it looks like your results are pretty close to the theory, so we can say that a 500wh battery will allow you to climb around 1km provided that you keep the motor more or less in its efficient zone and provide enough power yourself to overcome the resistances of the same ride as if it were flat.
The difference in power required between riding a full suspension MTB with 3" knobbly tyres on a rough track and a trekking bike with thin 700c tyres on smooth tarmac are going to be chalk and cheese.
The Bosch range calculator has a lot of variables to give reasonable estimates, but it doesn't take into account any hills, nor rough surfaces or really big tyres. From the above calculations, you can see that a 75kg rider needs to deduct around 30wh from the battery for each 100m he climbs, which is 7.5% and around 10% if you're 100kg.
On the flat, a 100kg rider would get 52km range in tour mode, or 46km with 100M climbed, so deduct 10% for 100m climbed and another 10% for not smooth road, which leaves you with 42km or 26 miles. That would go up to 29 miles for a 75kg rider.
https://www.bosch-ebike.com/en/service/range-assistant/
