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Sterling Battery to Battery Digital Charger
This innovative device from Sterling allows you to charge a second battery from your starter battery without discharging the starter battery. There is no reliance on a specific charging method for the primary battery i.e. charging from a generator, hookup, alternator etc. The battery to battery charger also ensures that the primary battery does not get discharged by its use.
The battery to battery charger is very easy to fit
Sterling's battery to battery charger really is a unique device and such a simple idea. The charger simply detects any excess power available such as if the engine is running or if a generator is being used, this excess is then utlised to charge a second leisure battery at the optimum speed.
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 Sterling Battery to battery charger?
The best way to charger 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 it to a standard engine battery and it will fool the alternator in to working at its maximum ability in order to ensure all its surplus power is utilised to charger 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 programable 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 are some times no choice but to use gel or A.G.M.; the unit has the settings to enable these to be charged within there 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) Mutable 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 a 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 charger 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. every 15 mins the unit stops for 2.5 mins to ensure the engine battery is o.k. 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 charger 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 (Motorhomes, 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 in its limits) and the domestic battery goes up to 14.4.-14.8. In order to put a good fast charger into the auxiliary batteries this is especially good if the battery bank to be charger is not close to the starter battery; such as things like bow thrustors, or batteries in the boot of cars or lorries.
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 a extra battery bank is required such as a bow thruster or radio battery bank or a generator, for ease of installation simply drop on a d/c battery charger.
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 with no problem. The fact that one battery bank is further away than the other will make no difference.
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 gen 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 charger from a old type battery charger; for example if you had a 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.
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