There's no magic formula in any ebike. It's very simple. However much power the motor helps you up a hill, it all comes from the battery. The more help you get, the faster the battery goes down. If your battery doesn't go down very fast, then you're not getting much help from it. Obviously, a big battery will last longer than a small one.
Absolutely agree with that.. Well said..
Kiwi
You quoted a read out of 530w on your bike.
Exactly what were you doing with it at time ? And
a) Could bike remain in that condition long ?
b) Could rider maintain what he/she is doing for situation to continue ?
I suspect answer to both is no.
Let me explain....
My cd unit is torque activated. It requires a resistive torque from bike not wanting to move and a motive torque from rider at pedals. If latter is greatest bike chips in.???
Now my bike is quoted as max poss torque at crank of 80nm. That's near enough 60ft/lbs.Bike on its highest setting gives 280% aid. Bosch gives 300%. In other words in high setting for every ft/lb rider puts in bike puts 3 to a max of 60....
Look at that other way. To get that 60 rider has to put in 20. That's easy when stood but as cadence increases it becomes increasingly difficult..( a crank torque of 20 ft/lb equates to a pedal force of 26lb ( pedal being around 3/4 of a foot)
The most important power limiter on pedelec is not the electrical controller its the nut that connects the handle bars to the saddle..the rider..
Yes for a brief instance a 20a controller may supply 20a but system is designed for this to quickly subside. Even climbing hills.
( strictly speaking we should call torque pound foot, ft/lb is actually a unit of work, but I wont open another can of worms)
And just as an asside..even in highest setting ( assuming a cadence if only 60) rider is putting in 220w. ( power in hp is pound feet x rpm / 5232.) to get bike to give its max.. Not an impossible amount by any means but bike will soon be over its 15.5 mph limit on road and hitting rocks too quickly off road..so rider slows down , probably changes down to reduce resistive torque and hence lowers his input to under 20 pound feet. Bike settles to well under 250w..
The controller rarely gives 20a because its rarely told to do so..its why throttles/ hand controls are banned.
And , slightly different but ...in many situation current consumed does not correlate with power produced..start up current on your fridge will be around 10x its steady state. ( 250w motor starting under load can draw 10a at 240v. Does not make it a 2.5 kw motor..its still only producing 250w in your fridge)
