Enerdrive ePOWER 12V 40A AC Battery Charger

21 Reviews | Q&A


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Product Description

The Enerdrive ePOWER 40A AC 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.

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).

PRO TIP: Common accessories to go with this Enerdrive 40A AC to DC are either the 50Amp60Amp or 70Amp breakers. These are available in the Accessory List above to add as optional extras.

40A Battery Charger Features:

  • Multistage Charging: Fully automatic multistage battery charger with the ability to charge 3 separate battery banks.
  • Separate Battery Banks: Isolated charging design where battery bank one is separate from battery bank two and three.
  • Programmable: Battery bank 1 can be programmed with a different charge algorithm over banks 2 and 3.
  • Current Control: User adjustable current output (e.g. Dial the 60amp unit back to run off a 1kVA generator).
  • Smart Charging: The ePOWER 40A battery charger will regulate its output based on the loads connected to your battery banks.
  • Wide AC Input Range: Operates on both 110V / 60Hz and 240V / 50Hz.
  • LED Display: Easy to use “set and select” menu along with scrolling charger status.
  • Silent Mode: Disables the cooling fan for total silent operation at night or whenever required. Activation reduces charge output by half and locks out fan for 12 hours.
  • Temperature Sensor: Battery temperature sensor included with 3 meter cable.
  • 5 Year Warranty from an Australian company renowned for customer support.

Enerdrive Product Brochure

Enerdrive Product Manual

Enerdrive Operating Guide


SKU EN31240

Brand Enerdrive

GTIN 9342616000250

Product Category Battery Chargers

Warranty Period: 5 Years

Model EN31240

Product Type 12v 40Amp Battery Charger

Ingress Protection IP32 (Basic drip proof in vertical orientation)

Float 13.4 – 13.8 V

AC Input Voltage 90 to 265 VAC

Output Current Rating (Amps) 40

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

DC Output Ground Single Heavy Duty Common Ground Stud

Battery Temp Sensor Port RJ12 (standard battery temp. sensor supplied)

Reverse Polarity Yes, (with user replaceable fuse/s)

Over Temperature Protection Yes, unit de-rated and shutdown

Equalize 16.0 V

Storage Range (temp) -40° to 70° C

Power consumption (DC 12V) 700W (Full Load)

Charging Control Four stages (Bulk/Absorption/Float/Maintenance), Two stages (Bulk/Absorption)Constant Power Supply (Program setting), Priority Battery Bank Charging

Output System Voltage 12V

Operating Range (temp) -20° to 60° C

Humidity 5-95%, relative humidity non-condensing

Net Weight (kg) 2.6

DC Output Connection Heavy Duty Terminal (3 banks) – Pan Heads 6mm Thread

Output Short Circuit Yes, (with user replaceable fuse/s)

Power Factor Correction Yes

Temperature Setting Hot, Normal, Cold (no sensor connected)

Charger Mode Output Voltage 14.2 – 15.5 V

Charger Efficiency > 82%

AC Input Operating Range 207-265 Vac (3.8 A Max)90 – 125 Vac (7.7 A Max)

Standby Current < 2 mA

LCD Display Charging status, Battery Voltage, Output Current & Fault Codes.

Dimensions 295 x 206x 86 mm (L x W x H)

Regulatory Compliance Complies with AS/NZS 60335.2.29 Including Australian deviations.

AC Input Connection IEC with Supplied 1.2M Power Lead

Over Charge Yes, unit shutdown

AC Input Frequency Range 47 – 63 Hz

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

Optional Accessories Remote Digital Display / Enerdrive Part Number EN3REM

Cooling Forced air ventilation (thermo controlled fan)


How to Program Your AC Charger for a Lithium Battery


Introducing The Enerdrive Battery Charger Range


All about the 40A Enerdrive AC Charger


Customer Reviews

Very Happy with Charger Review by
This product feels solid and looks the part. Very easy to install and provides great options for charge profiles, which future proofs the system when I upgrade from an AGM to Lithium batteries. Other great features that made me choose this product is the power supply option and variable output charging rates. It really is a set and forget charger.
(Posted on 21 June 2022)
Great product & service Review by
I have had a enerdrive 40 amp battery charger for for 7 years this new one is for my tow vehicle
(Posted on 28 May 2022)
My Generator is very good. Review by
Enerdrive are the best product for a lithium system.
(Posted on 5 June 2021)
Quality Product Review by
This is a fantastic product. The ability to select multiple battery types allows me to continue using my AGM batteries until replacing them with Lithium batteries. Also knowing that the batteries are being kept at their optimum performance without the risk of damage is very reassuring.
(Posted on 22 July 2020)

View All Reviews

Excellent Review by
Excellent product, easy to install and use. I use the charger on my yacht to keep 2 banks of 12V/225 ahr deep cycle Trojan T 105 batteries fully charged all the time. No need to adjust charging parameters as the charger is fully automatic.
(Posted on 5 April 2020)
Very happy camper Review by
Works an absolute dream with my new 200ah lithium battery. Not that I need it as the sun has kept me charged in recent weeks thanks to other Enerdrive products installed.
(Posted on 29 January 2020)
Working to spec, great item Review by
Seems to do what it says in the manual, very easy to install, has been running well.
(Posted on 3 January 2019)
needed a 40 Amp charger for a motor home Review by
I needed to charge 3x AMG 130 Amp batteries in a motor home, perfect for the job.
(Posted on 20 December 2018)
Battery charger Review by
The Enerdrice battery charger is an unbelievably good piec of kit!
(Posted on 25 November 2018)
Exelant service Review by
Very good unit had no problems
(Posted on 24 August 2018)
High end Charger Review by
The Enerdrive 40amp AC charger is connected to an Enerdrive 200aH Lithium battery. The charger is top quality and very quickly charges the battery at 20% per hour. Full instructions and the manufacturer is in Australia so easy to talk to which I have on a couple of occasions. Completely happy with my purchase.
(Posted on 14 August 2018)

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Product Q&A

Ask Us a Question
  • What size battery charger do I need for my lead acid battery I have in my camper?

    A good battery charger rule of thumb for charging a lead acid battery, is using a charger with output current (amps) of 10-20% of the battery total stored capacity (Ah).

    So, for example if the battery is 12V 100Ah, the charger need to be minimum of 10A and maximum of 20A.  Often splitting the difference at 15% (so a 12V ~15A charger) is a good option. Happy charging!

  • How do you suggest allocating the 3 banks to a 3bank charger to two lithium banks and one lead-acid bank ?

    Hi- Only bank 1 can be set to a lithium charging profile. More information can be found from page 20 of the product user manual. Thanks

  • I running an Enerdrive EN31240 ePower 12v/40Amp Charger in my Caravan. When connecting to 240v I am receiving A65 code message.I have searched manuals and operating guides but cannot find any explanation of the Error Message.Please advise

    Hi There,

    Please contact Enerdrive tech support on 

    Phone: 1300 851 535


  • If this charges to 3 banks of batteries, Does the unit come with the necessary cables to connect to 3 battery banks? or could you please provide a simple diagram of how this is done.

    HI There,

    The charger will not come with the cables to connect to three separate battery banks. These would need to be supplied at your end.

    For a simple diagram, please refer to page 20 of the user manual:


  • Hi, Is the 40 amp enerdrive AC charger suitable fo mounting up side down. Thanks Merv.

    Hi There

    The unit should be mounted vertically (with the battery terminals facing downwards). This provides the best thermal performance and drip protection.

    The unit should NOT be mounted upside down.

  • I want to use a generator to run an Enerdrive Battery Charger like this - what is the recommended size generator?

    Hi Tom – the most popular size generator to run a battery charger like the Enerdrive ePower series is a 1000 Watt generator, such as the Yamaha EF1000iS. It is lightweight, fuel efficient and very quiet. 

    Note that the Enerdrive ePower 60Amp Charger model will draw a max 1050 Watts of power, in which case you might want to look at a 2000 Watt generator if you want to get the full power of of your 60Amp charger. Alternatively, the ePower charger series have a Current Control feature, which allows the user to adjust the current output - so for example you can dial back at 60Amp charger to still run off a 1000 Watt generator :)

    Many thanks.

  • Is this charger able to charge a calcium battery, the specs only mention Gel, AGM, Flooded, Lithium

    Unfortunetely they don't have a Calcium charging profile. You would need to contact your calcium battery supplier and find out if they recommend one of the standard settings noted, ie Gel, AGM, Flooded or Lithium, and then set the chargers accordingly.


For details relating to this product's warranty CLICK HERE


    For details relating to our delivery process CLICK HERE

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