Mondraker Thundra losing power

[_Nutty_]

Hello!

First post. I actually joined the forums just to post this question. So far, no one helped me, not even the reseller.

After a few (less than 10) miles, if help is turned on always, even in ECO, bike reduces assistance to a minimum! If I change to BOOST, the level of help feels like ECO! If I continue to push on, it cuts off!

I once started a ride on a hill of over 10% for one mile. By the time I got to the top, help was next to zero and even cut-off twice. For a few moments all I had was leg power!

It's a nuissance since it happens when the legs start losing power (I don't ride that much) and when help is needed the most!

Any ideas?

 

[Mikerb]

sounds like thermal cut off. It may be a faulty motor or it could just be you using a low power mode/low cadence/ too high a gear.

 

[Mabman]

Check you battery voltage at full charge. Sounds to me more like a low voltage situation.

 

[lightning]

ls this a new bike? How many miles has it done?
It could be a faulty battery. Ebikes like you to spin the pedals, say around 80-90 rpm

lf you grind up a hill in a high gear, with a slow cadence, as suggested above the motor could overheat.

Not saying that's what you are doing, just throwing it in as a possibly

 

[_Nutty_]

Replying to all...
I bought it new. It has around 800km. I doubt it's battery related. It happens regardless of battery charge and after it happens, if I let it cool down, power is back to normal. I read about thermal cut-off and it's true I'm not able to sustain medium/high cadences. I usually ride at 60 or 70 rpm. In climbs, maybe even 50. I just want to be sure that this behaviour is something I should expect and not some sort of malfunction since warranty ends in less than a year.
Is there a way to be sure it's thermal cut-off?
Thanks.

 

[lightning]

l'll try riding mine like that later and see if any issues come up.
But it does sound like you have a fault somewhere with the bike.

 

[Mikerb]

l'll try riding mine like that later and see if any issues come up.
But it does sound like you have a fault somewhere with the bike.

your trial in 8/9 degrees C is not going to be the same as the OP in the Azores.....17/18 degrees.!