Chalo said:BalorNG said:Assuming a decent efficient system (80%),
That's a faulty assumption. When you stack controller and motor losses to get the vehicle up the hill, aero and rolling losses while in motion, motor and controller losses when regenerating downhill, and battery charging losses when storing the recovered energy, your assumptions are wildly optimistic.
I think other folks' demonstrated and measured results of up to 10% energy recovery are more in line with what you can expect. Your estimate that you could ever recover two-thirds of battery energy is laughable.
You misread my post.
Again, assume, say, you are PEDALLING to maintain 30kmh on the flat (not that hard if you are a decent rider on a decent bike).
You encounter a hilll. You continue pedalling same cadence, same power, keep speed the same but add progressively more assist.
You crest this hill. You *continue* pedalling with same power, same speed, but now add regen to keep speed this way.
This way rolling resistance and aero losses are constant and irrelevant... it might be hard to do on a really steep hill, right - both when it comes to motor power and battery absorption capacity, but it is possible. It is also possible to have the system considerably more efficient using higher-grade componentry (like astro motors, right, or similar grade inrunners with one step of reduction to keep things at maximum efficiency) and a large battery that can absorb this power (I have 2.3kwh for instance, like 2 or so real but that is good enough for me).
Of course, few actually ride that way, but *I* just might.