Navitas Support
Frequently Asked Questions

Have a question for our support team? We've compiled answers to our most common questions below. Take a look at our questions below, or view our support center for Manuals, Installation Guides and Wiring diagrams specific to your vehicle.

Yes, OEM Controllers generally limit the top speed of the vehicle.

In some cases you will need to purchase a speed code to change it. With our OTF Programmer, you will not be required to purchase a speed code. You can adjust the speed of the vehicle to the maximum capabilities of your motor.

Turn down the speed limit to use less energy.

When using the On-The-Fly Programmer, turning the speed limit down reconfigures the Controller and adjusts the motor so that it uses less energy to push the vehicle. This significantly reduces the current demand on the battery and leads to a noticeable increase in range.

Increase the amount of regenerative braking going down hills.

With the On-The-Fly Programmer, increasing the amount of regenerative braking will not only put energy back into your battery pack but it will also save wear and tear on your brakes.

Limit the acceleration of the vehicle.

Limit the acceleration of the vehicle to reduce the size of the current peaks drawn from the batteries. This also will lead to an increase in range.

Our Controller uses premium electronic components and finely tuned power boards.

It does not generate much waste heat. Therefore, it runs cooler. This means that we can package our Controller into a smaller footprint and that we do not need any external cooling fans to dissipate wasted energy.

Many factors are involved in selecting the most appropriate motor controller for your application. When you select your motor controller, you should have as much of the following information as possible: ​

  • Type of motor being used (e.g., series wound, permanent magnet, separately excited, brushless DC [BLDC], or AC)
  • Motor horsepower or kilowatt rating (peak and/or continuous)
  • Number of motors and purpose (e.g., traction, hydraulic pump, steering, etc.)
  • Nominal battery voltage and type of battery/power source
  • Throttle type/function: resistive (0-5 K, 5-0 K, etc.), inductive, hall sensor, isolated voltage, unidirectional, bi-directional
  • Expected peak and continuous current (amps) and length of time required to run at continuous current
  • Special features required such as programmability, battery regeneration capabilities, CAN control, etc. A Navitas representative will be happy to assist you in selecting an appropriate controller. Please contact us to discuss your application.

Learn how to install the TAC2 controller into specific vehicles.

View the Navitas TAC2 Installation/Service Manual

Watch an installation video based on your vehicle type:

RXVRXV Danaher

Yamaha G29 DriveYamaha Drive 2


Club Car Precedent

A 600A Controller is capable of draining a battery pack faster than a 400A unit, but in reality, the Controller supplies only as much current as the vehicle requires.

Ultimately it is the demand curve of the vehicle, which determines how quickly your battery pack will be drained. Once you are rolling, the vehicle is probably using less than 100 Amps. At this point it will be the efficiency of the Controller and Motor that determines how much battery current is needed.

How to diagnose the reason the vehicle is moving slowly:

  1. Check the mechanics of the vehicle
    • Check the tires are properly inflated
    • Check the brakes are not dragging
    • Check that the front end alignment is correct
    • Check the battery is fully charged

  2. Check if the battery is dead or low (Dealer only)
    • If the battery voltage collapses when driving then the battery is dead

  3. Reprogram the controller for the specific motor (Dealer only)
    • Go to the download section in the App
    • Select the motor type and click reprogram

How to diagnose the reason the vehicle is not moving:

  • Open the Navitas app to diagnose the problem.
  • Click on your vehicle serial number to open the dashboard
  • If there is a yellow caution button then click to see error message
  • If no yellow caution, read the green print at the bottom of the screen to see the input the vehicle is waiting for
  • Open the diagnostic page to check I/O, to monitor the corresponding input
  • Search for the specific solution in our FAQ page on our web site. For example: foot switch, key switch, direction switch, etc.

No, the controller will operate with stock cables and solenoids. However, we do recommend installing a heavy-duty solenoid and we suggest 4AWG Battery & Motor cables for our 400A controller and 2AWG cables for our 600A controller.


If the voltage is less than 60V, just a special set of Parameters will be required. If the vehicle requires 64V or 72V, a hardware upgrade is needed. Call our Technical Support number for more information at 844-576-2499.

At Navitas Vehicle Systems, we manufacture and sell electric motor controller accessories. We offer a wide variety of accessory parts to provide our clients with a one-stop shop for all of their electric vehicle needs.

Our support team works hard to ensure all messages are responded to within 2 business days.

Contact Information

Tel: 519-342-0948
Toll-Free: 844-576-2499
Fax: 519-725-1645

​Office Hours

Mon - Fri: 9am - 5pm EST