JES2020
Well-Known Member
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The confusing thing is, you say the battery has maybe 30 amps vs 30 amp hours.(remember the controller determines the amps to the motor NOT the battery).started at 51.4v pushed bike at pass 3. Two kilometers then died 50.8 v. Waited 2 mins started pass 1. no problem could ride 80 kilometers at low speed controller no problem,only when ask for more power at pass 3 the bike switches off.i can only think the controller cant deal with the request of more power and speed the power is there but it wont pass through the box at anything over the 18 amp cut off point. So I think its reduce the battery size or increase the controller size to handle at higher ampage
But from what you describe, it sounds like a battery problem. Like severe sag. It could be a defective controller I suppose, but the controller shouldn't shut down the bike until the the low volt shutoff point is reached, on a 48 v controller that point can be somewhere between 39 and 43 volts. I assume you are using a 48v controller?
If I was confident in my battery, the next step I would take is to replace the controller.
You can go to a higher amp controller IF your motor wiring can handle it without burning up.