My chair keeps popping the breaker when going up a ramp. I can drive around fine, but it'll trip the breaker 2 or 3 just trying to get up a ramp. Does anyone have any ideas on what may be causing it?

The load on the motor changes based on the amount of work is has to do. Typically, work is defined as weight over distance at incline angle.

An increase in any one of these will increase the amount of work being performed. Likewise, decreasing any of these will reduce the amount of work being performed. If there is something rubbing - adding friction - such as a failing ball bearing in either the motor, drive mechanism, etc. - this can cause the breaker to trip, too. The other thing is the battery. If the battery is aging and has a problem with the voltage level, the motor will require more current (amps) to run. The circuit breaker looks only at the amount of current (amps) and if it exceeds the value of the circuit breaker - it will trip. You may wish to have the battery and charger checked out. Additionally, check the drive train and all parts that need lubrication and that are meant to spin freely. Anything that is binding adds to the load passing thru the circuit breaker and may be causing the current level to rise to the tripping point of the circuit breaker under conditions that previously were not a problem. Good luck!