The SELECT™ is an original, all-weather liftgate charging system designed to fully charge electric liftgate batteries. It boosts voltage through a DC/DC converter to charge batteries faster and overcome voltage drop from the tractor to the liftgate batteries.
The SELECT can draw power from either the tractor or the reefer via either the stinger cord, reefer, or 7-way aux pin. The controller automatically regulates and maximizes liftgate battery charge time to fully charge liftgate batteries.
Increases battery life
Increases battery state of charge
Automatically detects the best charging source from available options
Allows liftgates to operate more efficiently
Shows battery and charging system status with easy-to-read LED indicators
Alerts drivers and technicians to potential problems, thus reducing troubleshooting time
“The SELECT system has helped us constantly keep our batteries charged. We love the indictor lights so that we know if the trailer leaves the yard at a good state of charge. The system is simple and easy to use, and Purkeys has always been there to support us when support was needed.”
Purkeys warrants each product to be free of defects in material workmanship under normal use and service. This warranty benefits the customer and covers products made by Purkeys and sold by Purkeys or their authorized dealers. The warranty period is 36 months. This warranty is not valid if the product is not used correctly or is altered without written consent. Defective products must be inspected by Purkeys as part of the warranty claims process. The warranty will not apply if the product is subjected to an accident, faulty repair, improper installation, neglect, or defects in the peripheral vehicle components.
The Select Liftgate Charging System uses two or three inputs from the stinger, 7-way cord, or reefer; an electronic controller; and a DC/DC converter to optimize charging voltage and extend liftgate battery charging times. LED indicators on the front of the controller show liftgate battery and charging system status to alert of potential charging system problems.
How do Select and Direct Liftgate Charging Systems optimize charging voltage?
Direct and Select Liftgate Charging Systems optimize liftgate charging voltage in two ways. First, the DC/DC converter eliminates the voltage loss associated with traditional extended length dual and single pole charging circuits by raising the low-charging voltage to the correct level. Second, the DC/DC converter adjusts charging voltage based on temperature, with higher voltages in cold weather and lower voltages in hot weather. These two features ensure optimal charging voltage to maintain maximum battery state of charge for increased liftgate performance and battery life.
How do Select and Direct Liftgate Charging Systems extend battery charging times?
Direct and Select Liftgate Charging Systems can extend battery charging times by keeping the DC/DC converter on, even when the truck or refrigeration unit is turned off. This is done by the controller, which monitors the truck/reefer battery state of charge and only allows extended charging to occur if the truck/reefer batteries are at a high state of charge. When the controller detects the truck batteries becoming discharged, it turns off the DC/DC converter, protecting the truck from a possible no-start condition.
What is voltage drop?
Voltage drop is the loss in voltage in all or part of a circuit when electrical current is flowing. Voltage drop can only occur when current is flowing.
How long does it take to install a Select or Direct Liftgate Charging System, and will it require special tools or training?
All Select and Direct Liftgate Charging Systems come with comprehensive installation and troubleshooting guides that include detailed text and photos. No special tools or training are required. The guides can also be accessed on our website (HTTP://PURKEYS.NET/SELECT/#PRODUCT_INFORMATION and HTTP://PURKEYS.NET/DIRECT/#PRODUCT_INFORMATION). Installation times vary, but first-time installations can generally be done in approximately 4 hours. Installations can be done in less than 4 hours once a technician becomes familiar with the process and trailers being worked on.
How do I know if the Select or Direct Liftgate System is charging the liftgate batteries?
Select and Direct Systems have LED Indicators to assure the operator of proper system function. A properly charging system will have a Lift Battery and Source (Reefer, Stinger, or Aux) LEDs that are solid green when there is sufficient power available at one of the input sources.