We recently purchased a PROJECTA Intelli-Charge Automatic 12 volt 25amp 7 Stage Battery Charger to be used as a fast charge and also slow over night battery charger. The unit itself is quite compact and mobile and can also be mounted permanently which is great with the optional remote Control. The main reason we chose this particular PROJECTA brand is the easy to use functions and inbuilt Automatic 7 stage Battery Charging system. Please use the follow as a guide and also refer to the instruction manual supplied with your charger.
There are are 5 options for the battery chemistry and allow you to match the correct charging profile for each battery type. Selecting the correct setting here will ensure you get the best battery performance and battery life.
POWER SUPPLY (Constant Voltage of 13.8 Volts).
This charge mode will charge at a constant voltage of 13.8VDC and is best suited for power supply batteries in caravans.
GEL (MAX Voltage of 14.1 Volts)
Gel Cell batteries electrolyte is suspended in a silica type thick paste gel like material that allows the electrons to flow between the plates.
AGM (Max Voltage of 14.4 Volts)
Absorbed Glass Mat batteries are a special design battery utilising a glass mat, designed to wick the battery electrolyte between the battery plates. AGM batteries contain only enough liquid to keep the mat wet with the electrolyte.
WET (Bulk and Absorption 14.7 Volts, Recondition up to 16 Volts)
Wet-Cell batteries are the original type of rechargeable battery and commonly found in vehicles. The battery contains a liquid electrolyte such as sulfuric acid, a dangerous corrosive liquid that damages what it comes into contact with.
CALCIUM (Bulk and Absorption 14.7 Volts, Equalisation & Recondition up to 16 Volts)
Silver Calcium alloy batteries use water-acid electrolyte, but with grids made from calcium-silver alloy, instead of traditional lead-antimony grids similar to Wet-Cell batteries.
Choosing the Correct Amps…
The battery will want to draw its own amps when charging however depending on the condition of the battery it will need to be regulated. Older batteries will require a lower amp setting so will a battery that requires a low charge. Carrying out a fast charge on a battery the amps can be set to a higher setting but will need to be monitored.
Slow Overnight charge or Power Supply applications will need the amps set to a lower rate better suited to the capacity of the battery. We use the following calculation…
Battery CCA Rating ÷ 6 × 0.1 = AMP Setting (Example: 600CCA ÷ 6 × 0.1 = 10amps)
Battery AH Rating × 0.1 = AMP Setting (Example: 80AH × 0.1 = 8amps)
Battery MCA Rating ÷ 8.4 × 0.1 = AMP Setting (Example: 930MCA ÷ 8.4 × 0.1 = 11amps)
Fast Charge of flat batteries due to lights left on or very little use of the vehicle or its slow to start. The amps can be set to a max setting the older the battery the higher the risk of problems. It is recommend to remove the battery to avoid damage to paint etc if acid leaks from overflow.
Charging Time is regulated by the amps and the more amps the battery wants the faster it will charge. However some batteries may want 25amps but can only handle 8amps to achieve a better end result. If the battery is an unknown condition use a lower rate of amps and allow it more time to correctly charge.
The recondition mode can restore batteries from a deeply discharged state by equalising the cells (equalisation charge) ensuring they are operating at full capacity. A recondition charge should be performed periodically to optimise the battery’s health and performance.
First its recommend to remove the battery from the vehicle and then follow the above steps for setting up the charger to suit your battery.
Second when the charger is setup “Press the Reconditioning Button” and allow the charger to carry out this mode for 4 hours. When the reconditioning is complete the charger will continue to carry out a normal charge on the battery.
If you want a compact but functional battery charger you can go past the Intelli-Charge range of chargers. With currently nine different options from 7amp to 50amp charges your able to better match the charger to your requirements.