Converted to Lithium 48 Volt - Super Slow

I charged the cart up fully 53.7 volts.
53.7 @ Positive side of Solenoid and 52.2 on the outgoing side of Solenoid with no diode installed.
52.2 @ A1 on controller. Press pedal it drops 2 volts and returns to 53. 2 and holds.
Go to motor and basically same numbers.
HOWEVER, when checking A2 on motor it goes from 52.2 down to 20 volts and jumps around to 36 back to 28 very sporadic.
I am changing the cable now and going to test it again
 
When connecting Volt meter positive on the A2 on motor and negative to battery pack. Meter goes from 52.2 down to 0.3 volts and remains the entire time you hold pedal to floor
 
Is A2 the output of the controller to the motor? If so then that voltage will be all chopped up by the controller and you can’t use a DC multimeter to monitor it accurately.

When checking the voltage at the input to the controller, are you also moving your multimeter negative lead to the controller negative terminal or are you keeping it on the battery negative? You should move to the controller negative.

Is 53.7v with the charger connected or after you’ve removed the charger and the voltage has settled? If it’s with the charger connected then that’s too low to charge a 48v lithium battery. Did you also upgrade your charger when you installed the lithium batteries?
 
It sounds like A2 is a negative pulsed output. I.e. the controller maintains full voltage at the motor then pulses A2 low to run the motor.
 
Yes sir that is the charger that was sold to me as a kit 2 lithium batteries, charger and charge meter.
That is settled voltage after removing charger. Removed charger due to green light on and was not adding and additional output
 
Charger is good then.

I believe controller is operating as it should, so just check the input voltage to the controller under full load, using both positive and negative connections on the controller.
 
I am at 52.1 press pedal solenoid engages and volts go to 53.3.
Press pedal down and when WOT voltage falls as low as 45 volts. Quickly returns to higher numbers as pedal is brought up.
 
If there was a problem with the batteries not being able to supply the required current then they would shut themselves down as a protection measure. That isn’t happening. I’m suspecting that voltage is being lost between the battery and the motor when high current is drawn I.e. you have a high resistance connection somewhere.

You may still need to purchase another battery once the initial problem is fixed as the high resistance may be limiting the current draw and hence preventing a battery shutdown. But at the moment we don’t seem to have a battery shutdown issue.
 
Elmerfud67 said:
I charged the cart up fully 53.7 volts.
53.7 @ Positive side of Solenoid and 52.2 on the outgoing side of Solenoid with no diode installed.
52.2 @ A1 on controller. Press pedal it drops 2 volts and returns to 53. 2 and holds.
Go to motor and basically same numbers.
HOWEVER, when checking A2 on motor it goes from 52.2 down to 20 volts and jumps around to 36 back to 28 very sporadic.
I am changing the cable now and going to test it again
Click to expand...
Just confirming, are these voltages, battery and controller input voltages, measured under load? If not, they should be.
 
No.

That’s a low voltage/current signal to tell the controller what to do.

The controller will have two terminals with heavy cables, one connected to battery negative and the other connected to the solenoid. Those are the two you need to check.
 
Then take the same measurement at the battery positive and negative terminals under the same driving conditions.

I want to make sure that the battery voltage is getting to the controller when you’re having the go slow condition.
 
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