Ezgo series Alltrax SPM 48500 question/problem

[Sir Nuke]

seeing as are using a stock motor, and you are getting more amps to the motor at take off, as you have seem......the fact that you have a series cart, won't gain you any speed, only an aftermarket motor or having your built by someone like Plum Quick will do that.

there must be a bottle neck in the high current loop somewhere.

[scottyb]

You should see a difference in torque going from 275 amp controller to 500 amps. This should reduce slowing on the hills.
Given a direct connection ( no controller) the motor would draw 100% of the available amperage (the battery pack) until it went up in smoke.
The main function of the controller is to limit the maximum amount of amperage the motor can access and to regulate speed by controlling this flow.

The controller does not send amperage. It allows the flow. If you have a restriction in the high amperage delivery to the motor the controller is not going to change that.

Tell us some more about the cart and its components, tires. Size and age of the cable set and rating and age of the F&R. These things can restrict low.

[Taylor1595]

6 inch lift 22 inch tires, flip back seat, with all the upgrades I got from you last week ( controller, solenoid and f/r ) and 2 month old batteries and 2 month old 4 g cables throughout. I know 2 g are recommended and plan on that in the future. I'm gonna look at all connections for any damage I guess to make sure.

[yurtle]

Originally Posted by Taylor1595

The spm shows continuous readout on the laptop. I watched really close and flooring it from stopped it spikes to about 300 amps for a fraction of a second.

I deal with industrial automation (used to before I retired), and refresh rate is a common term. I don't care if your computer looks like it has continuous readout, there "may" be a refresh rate setting that is not maximized.

This all boils down to data-logging and storage requirements, as well as other factors.

In any event, 300 amps spike doesn't sound too crazy. I have an onboard ammeter and usually run under 100 amps.

[yurtle]

Originally Posted by scottyb

The controller does not send amperage. It allows the flow. If you have a restriction in the high amperage delivery to the motor the controller is not going to change that.

Well said. A motor "asks" for amperage, you can't "pump" it. Voltage is delivered. Amperage is asked for.

[Taylor1595]

A couple of the cable lugs connecting to the controller are crimped pretty flat. Would this make a difference and restrict flow?

[yurtle]

Try driving pretty aggressively and see if they get hot.

[Taylor1595]

Replaced the flattened lugs and drove 4 miles at WOT and maybe a little better and snappier on the flat but still lugs down to 9 mph on the hill. Felt of all the connections and they weren't even warm then felt of the motor and it is hot to the points it's uncomfortable to keep your palm on it for very long.

[Sir Nuke]

Originally Posted by Taylor1595

Replaced the flattened lugs and drove 4 miles at WOT and maybe a little better and snappier on the flat but still lugs down to 9 mph on the hill. Felt of all the connections and they weren't even warm then felt of the motor and it is hot to the points it's uncomfortable to keep your palm on it for very long.

seeing as how you could keep you palm on it...even if it were uncomfortable, your motor wasn't hot.....at least by motor standards.

[Taylor1595]

Ok. That's good to know. Any other suggestions on why I still have no more umph going up the hill than I did stock? I'd be curious to know if anyone else has a 500 amp controller on a stock motor 36 volt series cart and what kind of performance gains they had.