Log in to My Account Page or Create an Account Cart Contents Checkout/Payments
Marcle Leisure for motorhome, caravan and marine accessories

Top Quality Equipment for the Motorhome, Caravan and Boating community

  Home » Sterling Battery To Battery Digital Charger Information »
Product Categories
 Air Suspension Kits 
 Air_Suspension Spares 
 Bathroom Eqp.
 Cab Equipment 
 cbe Electrical Ftgs 
 Chassis Equipment 
 Fiamma Bike Racks
 Gas Equipment 
 General - Accessories 
 Kitchen Equipment
 Ladders & Steps
 Mud Flaps & Wheel Trims
 Polish & Cleaners
 Racks & Storage
 Reversing Cameras
 Seat Swivels 
 SOG Toilet Ventilation
 Solar Panels 
 Tools & Workshop
 Window Blinds 
 _Send a Payment
 __Sale Items

Bookmark and Share

Shopping Cart more
0 items
Sterling Battery To Battery Digital Charger Information
On the surface this may look like another way of having an advanced regulator without wires (like the voltage amplifier). In a way it is. However this method has a specific market in mind, and, like the advanced regulator and the voltage amplifier, it has a very precise slot which it has been designed for and fits in there perfectly.

Why do I need the d/c battery charger?

The best way to charge a battery is using a 4 step battery charging curve (which cannot be achieved from a standard alternator). This system enables one to simply attach the unit to a standard engine battery and it will fool the alternator into working at its maximum ability in order to ensure all its surplus power is utilised to charge the auxiliary battery bank to its maximum. This system is designed to use only the surplus power, and at all times ensures that the power required to run the primary system (the vehicle system or the boat engine) is not effected. The surplus power is converted into a higher voltage and used to charge a secondary battery bank using a digitally controlled programmable 4 step charging curve as per all the other high charge products Sterling makes.

What does it do?

In a nutshell it charges your extra battery system about 5 times faster than it would otherwise charge and puts about 50% extra use full power into them as well as increases the life of the battery by de-sulphating them .
For best effect use open lead acid batteries, avoid gel, sealed and A.G.M.. batteries. (even though open lead acid batteries are by far and away the best for fast charging and longer life using advanced charging units ,there is some times no choice but to use gel or A.G.M.; the unit has the settings to enable these to be charged within their charging curves).

Advantages of this unit:

1) Installation: Simply connect to your starter batteries, and to your domestic battery.
2) No direct connections to the standard engine alternator, or to the outboard ( if used on an outboard). Thus on new installations there is no extra wiring for a split charger system
3) Ensures the engine battery if maintained and well looked after.
4) Multable units can be used; for example if you have a 60 amp alternator, and 3 battery banks (engine, domestic, and bow thruster) then 2 of these can be used to run the now thruster and the
domestic system. Their internal programs will adjust their charger patterns to accept the other unit, and ensure only the excess power is used and the primary system is not placed in jeopardy.
5) Ensures there is no voltage rise on the engine management system , to ensure no alarms or damage to the system be it an outboard, or a car, or a boat .
6) No vehicle warrantee issues as you are not connected to the main system.

How does it work?

The unit monitors the engine start battery. The unit will not start until the battery voltage exceeds 13 volts, then it waits for 2.5 mins to ensure that some charge is replaced after engine start. It then pulls the engine battery down to no less than 13 volts. This enables the engine battery to still receive a charge and ensures the alternator works at its full potential. To further ensure the engine battery is o.k. the unit stops every 15 mins for 2.5 mins.  The unit takes the 13 volts into the control box, then boosts this up to 14.8 (or what ever voltage the unit is set at) in order to fast charge the other set or sets of batteries. After a period of time ( calculated by the software) when the auxiliary batteries are full, the system will float the batteries at 14 volts, but always ensuring the engine battery comes first. It seems a simple idea, but its simplicity masks its complexity.
Other features included in this system include, remote control option, alternator temp. sensing, battery temp. sensing, ignition feed (if required), automatic start and shutdown. Its extra features and charging curves (software program) are very similar to the alternator to battery charger.

This unit can be used to charge extra battery banks from boat inboard engines, boat outboard engines, vehicle engines (cars, lorries, vans) and generator engines.

The dotted line shows the original system and how simple it is to connect the d/c charger.

This is the most common and simplest installation and is simply connected to the starter battery. In order to connect up the d/c battery charger, all you do is connect one wire from the auxiliary battery banks to the starter battery. The starter battery stays between 13-14 volts (within its limits) and the domestic battery goes up to 14.4.-14.8. In order to put a good fast charge into the auxiliary batteries this is especially good if the battery bank to be charged is not close to the starter battery.

Click to enlarge
This option shows a standard split charger system on any boat or camper vehicle, which is already installed, and has been using advanced alternator regulators or any other advanced charging system, then an extra battery bank is required such as a bow thruster or radio battery bank or a generator, for ease of installation simply install a d/c battery charger.

Click to enlarge
This option shows a situation on many boats or camper vehicles where there may be 3 x battery banks. Simply put 2 x d/c battery chargers on, and they will ensure both banks are catered for without any problems. The fact that one battery bank is further away than the other will make no difference.

Click to enlarge
This option shows a standard split charger system on any boat or camper vehicle, which is already installed, and has been using advanced alternator regulators or any other advanced charging system. You find that you wish to supplement the marine house battery bank with charging with as many other auxiliary charging systems as you can; for example if you are running a generator set for 4 hrs per day, you may as well put as much power as possible into your main large house battery bank.

Any source can be used. You can even use this system to charge from an old type battery charger; for example if you had an old constant voltage battery charger and you wished to convert it into a constant current on e then simply put one of these on the output, of if you have a single output charger and want a dual output then simply add one d/c charger to make a dual charging system.

There are some waterproof models being released soon which are designed with outboards in mind.

DC to DC 4 Step Digital Battery Chargers  
DC Volts In DC Volts Out Amps In Size (Apx.) Weight Order Code Price
12V 12V 50A 210 x 140 x 70mm 1.5Kg


Link back to purchasing page
12V 12V 100A 200 x 270 x 70mm 2.5Kg MLE00172 Not yet available
12V 12V 150A 200 x 270 x 70mm 2.5Kg MLE00173 Not yet available
12V 12V 200A 200 x 270 x 70mm 2.5Kg MLE00174 Not yet available
12V 24V 50A 200 x 270 x 70mm 2.5Kg


Link back to purchasing page
24V 12V 30A 470 x 250 x 90mm 2.5Kg


Link back to purchasing page
24V 24V 30A 330 x 210 x 70mm 2.5Kg


Link back to purchasing page
24V 24V 50A 200 x 270 x 70mm 2.5Kg


Not yet available
24V 24V 100A 200 x 270 x 70mm 2.5Kg


Not yet available
Remote Control   170 x 90 x 40mm 0.5Kg MLE00150  
Basic Description;

Charge a second battery from your starter battery without discharging the starter battery. 

Easy to fit!

With this new and innovative product you can charge a second battery from any other battery, no matter how the primary battery is charged (engine, generator etc.). At the same time the unit makes sure your primary battery is not discharged. 

Ideal for bow thrusters, motorhomes etc.

Order Code - MLE00171
12V in, 12V out @50A
Link back to purchasing page

Order Code - MLE00175
12V in, 24V out @50A
Link back to purchasing page

Order Code - MLE00176
24V in, 12V out @30A
Ideal for large commercial vehicles (Buses etc) utilising 12volt equipment
Link back to purchasing page

Order Code - MLE00179
24V in, 24V out @30A
Link back to purchasing page

Need a simple wiring diagram, click here


This remote control gives active information on the L.C.D. display such as Alternator voltage, Battery voltage, Alternator temperature, Battery temperature, set up details, time remaining on high charge etc. This unit not only displays all the fault conditions but also gives a detailed text scroll on the screen about the faults and what to do. Thus, ensuring on hand information in the case of a problem, even with the advanced regulator being switched off, a voltage display and alarm function is still in operation, making the unit useful at all times. A simple plug in lead ensures simple plug and play operation.

The clever case design can either be panel mounted, flush mounted or surface mounted.

Remote switch on/off
Battery Monitor Alarm on/off Background light on/off
Under-/over voltage warning
Battery voltage
Alternator voltage
Selected battery type
Charge mode and time
Battery temperature
Alternator temperature
LED: System OK
LED: System fault
LED: Alternator overheated System on hold until temp. decreased
LED: Under voltage warning
Help text in case of fault condition
Size: 170x90x40mm
Weight:  0.5kg
Contact us for price details

Order Code: MLE00150


Bookmark and Share

Shopping Cart more
0 items