If you are looking for the best DC to DC charger money can buy, Enderdrives ePOWER EN3DC40 12v/40a DC to DC Battery Charger is our top pick. This Enerdrive ePOWER 40a/12v EN3DC40 DC to DC charger truly stands out from its competitors. Engineered to perfection and manufactured to the highest possible quality, it's easy to see why Enerdrive is quickly overtaking the market. The Enerdrive ePOWER 40a/12v EN3DC40 DC to DC charger is a fully automatic multistage, multi-input battery charger that has the capacity to charge from solar power using the integrated Maximum Power Point Tracking (MPPT) Solar Controller or from an alternator connected to a battery. The main/house battery can be charged from any of the two accessible inputs: the engine when moving, or the solar panels.  Both functions are managed internally by the device itself without the use of external relays, making it completely automatic to select between the engine or the solar power.

With the option to select GEL, AGM, Flooded, Custom Programmable, or Lithium, this dc to dc charger will perform a full charge cycle to float stage on the home battery bank during regular operation. When float stage is reached the dc to dc charger switches to a power supply mode to handle any on-board DC loads.

Dc to Dc chargers Multiple-Stage Charging Method: 

The fully automatic, set-and-forget ePOWER EN3DC40 Enerdrive dc to dc charger is made to properly and quickly recharge your specialised deep cycle batteries using charger algorithms that extend the life of your batteries.

The multistage smart charging mechanism in the ePOWER dc to dc charger enables the charger to be permanently linked to your battery bank. You can be confident that your batteries will be charged while you are moving and when the sun is shining on your solar set up thanks to the input from different sources in this dc to dc charger. Deep cycle batteries require a multistage charge sequence in accordance with the instructions provided by the battery manufacturer for flawless, quick, and precise charging. Three primary charge stages are provided by the Enerdrive ePOWER EN3DC40 40a/12v dc to dc charger.

Stage 1: Bulk or boost charging; the battery is charged at the charger's maximum rated output current until it reaches the absorption voltage, which is the battery's final charging voltage. Around 80% of the battery is restored as quickly as the dc to dc charger can in this process.

Stage 2: Absorption Charge: The remaining 20% is replenished while the charger voltage is kept constant, and as the battery gets closer to full charge, the dc to dc charger allows the current to taper down.

Stage 3: Float. The dc to dc charger voltage is decreased and maintained at a steady, safe level throughout this stage. By doing this, the battery is kept from being overcharged while yet allowing the charger to deliver enough current to compensate for the battery's self-discharge losses and support any additional loads attached to the battery (such as DC lighting and refrigerators). This phase enables the dc to dc charger to function as a DC power source.

Adaptive Charging Function:

The loads connected to your battery bank will cause the ePOWER dc to dc charger to adjust its output. Since some dc to dc battery chargers misinterpret loads for discharge and hold the batteries in the bulk or absorption stage for protracted periods of time, damaging the battery bank, this function is crucial to preserving the life of your battery bank. To make sure that your dc to dc charger transitions to float when it should, the ePOWER dc to dc charger offers two ways of load-based regulation, making it one of the most advanced battery chargers available.

Features:

• Two totally independent DC Inputs for both engine and solar regulation charging one house battery bank output
• DC M6 screw terminals that will allow for large battery cable connection between all sources
• A dedicated Maximum Power Point (MPPT) solar regulator
• The same battery algorithms as included in our AC mains ePOWER battery charger. GEL, AGM, Flooded, Lithium and the ability to create  a full custom profile
• Vehicle input allows for either 12 or 24v and a maximum solar input of 45V/800W
• 40A+ output up to 40+°C with thermo controlled fan cooling
• Fully programmable LCD display to show which source is charging the battery along with charger status, voltage and amperage
• Temperature sensor included with charger for more accurate battery charging

 

Model	EN3DC40+
Output Rating
Output Voltage	12V Nominal (8.0V min)
Output Current (Maximum)	40A ~ 50A
Output Power	775W
Charger DC Output (CH1):
Selectable Battery Type	Gel, AGM, Flooded, Lithium, Program
Charger Voltage Range	13.8V – 15.5V
Float Voltage Range	13.0V – 13.8V
Charger Current (User Selectable)	5/10/15/20/25/30/35/40/45/50A (default 40A)
Equalize Voltage (Flooded Battery)	15.5V
Equalize Charging Current	10% of Bulk Current Setting
Charging Control	2 stage / 3 stage selectable (Default 3 stage)
DC Output Bank	Single
Current draw from CH1 when not in use	< 50mA
Battery Temperature Setting	Low/ Normal/ High (Battery Temperature Sensor Standard)
Efficiency	95%
INPUT Rating (CH2 – MPPT Solar)
Input Voltage	14.5 – 45VOC
Maximum Input	≤ 23V input, 500W (600W allowable) ≥37.5V-45V input, 750W (800W allowable)
INPUT Rating (CH3 – Start/Alternator)
Input Voltage	10.5 – 16VDC / 21 – 32VDC
Dimensions
Height x Width x Depth	242mm x 172mm x 74mm
Unit Weight	1.85 Kg
Shipping Weight	2.17 kg

 

Maximising your Solar Harvest using the DC2DC+

The Solar Input on the DC2DC+ unit has a maximum rated INPUT current of 30amps. This means it is optimised for using higher voltage ‘grid’ type modules for best output performance. The maximum achievable output using standard 20Voc solar modules will be approx 35amps @ 14.4Vdc

 

Panel Array	Rated Wattage & Volts	Open Circuit rating	Estimated DC Amps Output (## See Below)
1	150watt @ 20Voc	150watts	10
1	200watt @ 43Voc	200watts	13
2	150watt @ 20Voc	300watts	21
2	200watt @ 43Voc	400watts	27
3	150watt @ 20Voc	450watts	31
3	200watt @ 43Voc	600watts	42
4	150watt @ 20Voc	600watts	35*
4	200watt @ 43Voc	800watts	47**
5	150watt @ 20Voc	1000watts	Not Recommended
5	200watt @ 43Voc	1000watts	Not Recommended

 

* Maximum achievable output on the DC2DC+ unit when using 20Voc Solar Panels will be the approx 35amps. ** Maximum achievable output on the DC2DC+ unit when using 43Voc Solar Panels will be the approx 47amps.

Enerdrive B-TEC LiFeP04 12v 125Ah G2 Lithium Battery

Available in 12v 100Ah, 125Ah, 200Ah and 300Ah capacities and 24v 100Ah & 36v 100Ah, the ePOWER B-TEC lithium battery is designed and intended for use in deep cycle applications where a single battery is required that meets the amp hour capacity.

Smart Phone Monitoring System:

The Enerdrive Enerdrive B-TEC  G2 battery incorporates wireless Battery Monitoring Technology. By downloading the Android™ or Apple® app to your smartphone or tablet device, you can monitor the following information;

• Battery Capacity
• Battery Voltage
• Battery Current (Amps)
• Battery State of Charge (SOC)
• Battery State of Health (SOH)
• Battery Status
• Individual Cell Voltage
• Battery Temperature
• Battery Cycles
• Battery Alarms
• Battery Event Information

Battery Management System:

The battery is also equipped with an internal Battery Management System that can monitor and optimise each Prismatic cell within the battery during normal operation. It will protect the battery pack from over charge, over discharge, over temperature & short circuit. The BMS helps to ensure safe and accurate operation of the battery.

Size & Weight:

Lithium v AGM Capacities:

• 100Ah Lithium = 160Ah AGM
• 125Ah Lithium = 200Ah AGM
• 200Ah Lithium = 320Ah AGM
• 300Ah Lithium = 480Ah AGM

(Based on standard depth of discharge for both Lithium (80%) and AGM (50%).

The Enerdrive B-TEC battery provides 60% more usable power than its equivalent lead acid cousin and being nearly 50% lighter and 30% smaller makes for a superior alternative. The G2 now incorporates a “Built-In Reset Button” making re-starting a flat battery a breeze. No longer do you need to apply a voltage to the battery terminals to wake up the battery. Press the button and within seconds, the battery will come back to life ready to accept a charge source to rejuvenate the battery. The Enerdrive B-TEC battery is perfect for camper trailers, 4WD’s (AUX battery), caravans, small water craft, low power communication sites or any other application that requires the use of a single deep cycle battery that meets the amp hour capacity.

With over 7 years of researching, designing and testing lithium batteries and the associated charging systems, Enerdrive are at the forefront of lithium battery systems in Australia. Enerdrive are the only Australian company that can supply a fully integrated self-branded energy system to suit your setup. With over 3000 complete systems in operation Australia wide, Enerdrive is regarded as the leader in the field of lithium batteries and energy systems for Mobile, Marine and Remote applications.

Please Note; The B-TEC battery is capable to be paralleled to a second B-TEC battery of the same size. For maximum performance and lifespan of your B-TEC battery, no more than 4 batteries should be connected together to increase your overall capacity. Overall loads when paralleled should not exceed the current limits of a single batteries BMS.

The 125Ah G2 battery is able to accept a maximum inverter capacity of 1000W only. Exceeding the maximum inverter capacity can damage the BMS Management within the battery. If you are requiring a battery system larger than Enerdrive B-TEC battery, please look at the Enerdrive Pro Series Power Pack Systems which can offer multiple parallel and series connections with Active Cell Balancing Protection across the entire pack.

 

Specifications

Normal Specification	EPL-125BT-12V G2
Nominal Voltage	12.8V
Nominal Capacity	125Ah
Cycle Life (DOD – 80% under controlled conditions)	≥ 2000 Cycles
Standard Charge Specification (Lithium profile charger required)
Battery Charge Temperature	0 ̴ 45°C
Normal Charge Voltage CV/CC*	14.20 ̴ 14.60V
Standby (Float) Voltage	13.50 ̴ 13.80V
Maximum Charge Current	60A @ 25°C for 30mins
Recommended Charge Current For Maximum Life, Charge in the lower amperage range	20~60A
Standard Discharge Specification
Battery Discharge Temperature	-20 ̴ 60°C
Battery Output Voltage Range	11.00 ̴ 14.60V
Maximum Discharge/Pulse Current	100A @ 25˚C ±5˚C for 30 mins
Pulse Discharge Current	450A for 1.0s
Discharge Cut-off Voltage	≤11.20V
Circuit Protection	The battery is supplied with a LiFePO4 Battery Management System BMS that can monitor and optimize each single prismatic cell during charge & discharge, to protect the battery pack from overcharge, over discharge & short circuit. Overall, the BMS helps to ensure safe and accurate operation of the battery.
Over-Charge Protection
Over-charge Protection Per Cell	3.90V ± 0.03V
Over-charge Release Per Cell	3.60V ± 0.05V
Over-charge Release Method	Discharge below release voltage
Over-Discharge Protection
Over-discharge Protection Per Cell	2.80V ± 0.05V
Over-discharge Release Per Cell	3.20V ± 0.05V
Over-discharge Release Method	Apply Charge/Voltage ≥12.8V
Battery Manual Reset Button	Yes
Over Current Protection
Discharge Over Current	110A for 30s – 450A for 1s
Protection Reset Time	Approx 10s Auto Release
Over Current Release Method	Disconnect Load
Over Temperature Protection
Battery Discharge Over Temperature	Protection to 65°C ± 5°C
	Release at 50°C ± 5°C
Battery Charge Over Temperature	Protection to 55°C ± 5°C
	Release at 45°C ± 5°C
Short Circuit Protection	Auto release after 5s
Dimensions
Length	318mm
Width	165mm
Height	232mm
Weight	Approx 15.5 Kg
Storage Information
Temperature & Humidity Range	≤ 30 days -20°C ̴ 60°C, 5 ̴ 75% RH
	≥ 90 days -10°C ̴ 45°C, 5 ̴ 75% RH
Self-discharge Rate	≤ 3% Per Month