Enerdrive ePOWER 12V 40A Battery Charger


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Enerdrive ePOWER Battery Charger – EN31240


40A Battery Charger Features:

  • Multistage Charging: Fully automatic 40A multistage charger with the ability to charge 3 separate battery banks
  • Separate Battery Banks: Isolated charging design with each battery bank being separated from each other
  • Programmable: Each battery bank can be configured to different charge algorithms
  • Current Control: User adjustable current output
  • Smart Charging: The ePOWER 40A charger will automatically scale its output based on the load connected to the battery banks
  • Wide AC Input Range: Usable with both 110V/60Hz and 240V/50Hz
  • LED Display: Easy to use menu with scrolling charge status
  • Silent Mode: Disables cooling fan for silent operation when needing. Activation reduces output by half and locks out fan for 12 hours.
  • Temperature Sensor: Battery temperature sensor included with 3 meter cable
  • 2 year Warranty



Charger Output (Max): 40A

Output Voltage Range: 14.2-15.5 V

Charging Control: Four Stages (Bulk/Absorption/Float/Maintenance), Two Stages (Bulk/Absorption), Priority Battery Bank Charging

DC Output Bank: Three (1 fully independent, 2 common with diode isolation)

Battery Type: Gel, AGM, Flooded, Lithium, Program

Standby Current: <2mA

AC Input Voltage (Nominal): 90-265 VAC

AC Input Operating Range: 207-265 VAC (2.0A max) 90-125 VAC (3.8A max)

Input Frequency: 47-63 Hz

Power Consumption: 700W (Full Load)

Charger Efficiency: >82%

Features: Reverse Polarity Protection, Over Charge, Over Temperature, Output Short Circuit, Cooling (Temperature controlled fan)

Dimensions (L*W*H): 295mm * 206mm * 86mm

Weight: 2.6kg


Multistage Charging Process

The Enerdrive ePOWER 40A Battery Charger is a fully automatic, set and forget charger. It is designed to quickly and accurately recharge your batteries using algorithms that help maximise service life. Multistage smart charging technology enables the charger to be connected to your battery banks permanently.

As dictated by battery manufacturer s recommendations, batteries require a multistage charge sequence for perfect, fast and accurate charging. Our ePOWER multistage smart 40A battery charger deliver four primary charge stages:-

Stage 1

Bulk or Boost Charge; The battery is charged at full rated output current of the charger until the battery reaches its final charging voltage, known as its absorption voltage. In this step, around 80% of the battery capacity is recovered as fast as possible.

Stage 2

Absorption Charge; With the charger voltage held steady the remaining 20% is replaced allowing the current to drop as the battery approaches its full charge.

Stage 3

Float; Finally, in the float stage the charger voltage is lowered and held at a constant and safe predetermined level. This prevents the battery from being overcharged while supporting any additional loads connected to the battery, such as DC lighting and refrigerators. This stage allows for the charger to be used as a DC power supply.

Stage 4 Maintenance; This stage is a regular timed return to bulk stage. After 7 days of constant operation in float the Enerdrive ePOWER Battery Charger will switch the charger from float to bulk to agitate the batteries electrolyte helping to provide an extended service life.

Bank 1 PRIORITY Charge Where You Need it Most

The ePOWER 20A Battery Charger delivers a priority charge to Bank 1, or your main house battery bank which allows the charger to get this bank recharged the quickest, then transition the cycle to the lesser bank 2 & 3 batteries.

The priority function also allows you to have a battery chemistry different to the other two, such as an AGM battery for house and lead calcium for your start banks. In the event that all 3 banks are in need of a charge, an over-ride function helps recover all 3 banks quickly and evenly before switching back to prioritise on Bank 1.

It s All About Lithium

The recent advances in high capacity Lithium battery technology have seen the need to develop a battery charger suited to their needs. With most traditional smart chargers their suitability to Lithium batteries is limited. Lithium batteries require a constant current / constant voltage charge algorithm and are unique in that almost every amp-hour of charge delivered by the charger is accepted as one amp hour into the battery, hence the need to deliver a constant current as long as possible.

The Enerdrive ePOWER charger can be programmed for Lithium batteries. This setting delivers the full rated output of the charger constantly with the charger switching to power supply mode once the voltage peak is met (indicating a full battery bank).


The Display Panel

The ePOWER 20A Battery Charger display gives you all the information you need for the operation of your charger. At a glance, key information such as charger amps, battery voltage and charge state continually alternate on the screen.When in float / power supply mode, the load amps are displayed so you can see exactly what the charger is doing. The display also allows you to program all settings of the charger, as well as activate the silent mode.

Silence when you need it By pressing the SEL button for 5 seconds, the ePOWER Charger enters the Silent mode that prohibits the fan from working. This ensures totally silent and safe operation at night, ideal if the charger is located close to your sleeping quarters. Silent mode limits current output to no more than 50%, and is programmed to remain on for 12 hours before automatically returning to a normal fan-on & full output setting.


Battery Temperature Sensor

Included – standard with all ePOWER Battery Chargers.

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