2019 Rad Runner Controller Upgrade

[Altema]

Why would the 25amp controller be so much less efficient?

It lacks the dual stage output of the 35 amp version, so the 25 amp version has no efficiency mode for low power use. If you are riding hard most of the time and bursting to 1000 watts, the difference won't be as much. But if you are riding with mild pedal assist and only using 200 watts, you'll see a big difference in battery use between the two controllers because the 25 amp controller just doesn't have the low power efficiency stage. There may be other factors involved, but that would be information the manufacturer would need to provide. All I can state is the results from both controllers on the exact same bike, and there was always better range with the 35 amp controller.

Amount of detail I have found on the 25 amp controller has been nearly non-existent.  Your info is the first I have seen that would question the "value" of this controller upgrade.  While I am not fully questioning your results, do you know of any additional 3rd party results or reviews that would collaborate??  I have the 35 amp controller on my 2019 Rad Rover and love it.  Due to mounting differences, I have been reviewing potential of the 25 amp controller for my Wife's 2019 Rad City Step Thru.  Only 60% of battery range would be a serious no-go for me, so any additional information is appreciated.  FYI - I tried the EggRider V2 direct from EggRider, but I was not impressed. It constantly lost connection with iPhone and there didn't really seem to be any differentiation in power control with the PAS levels. The EggRider Facebook forum had several posts with same issues. It appeared to be all or nothing, so I returned it for refund.

The 25 amp version is not very popular, and the only reason I bought it from Electro Bike World is because they said 35 amps would be overkill on a folding bike. I never bothered looking for other reviews, as I owned both controllers at the same time (still have them), and I ride in consistent environments with precise mileage being tracked. It's up to you, and if you are unsure, buy both and try them out.