Battery Management

CTEK chargers are the smartest battery chargers in the World, designed and manufactured in Sweden. They are highly versatile, easy to use, compact battery chargers and proven award winners*. All the products manufactured by CTEK are tested and then constructed to the highest standards, which are far in excess of those required by the top product testing agencies such as the independent testing and certification agency, TÜV Rheinland Group.


CTEK chargers are ideally suited to a wide range of applications, including cars, caravans, motorbikes, trucks, boats, jet skis, ride on lawnmowers, tractors and virtually any other situation where a lead acid traction or leisure battery is used. They are also ideal if you want to leave the charger switched on for a long period of time, for example to maintain the charge of a battery on a classic car or boat over the winter period.


Why a CTEK charger?


TEK chargers feature smart technology, which helps save you money and prolongs battery life.

Charging efficiency is maximised and the need to replace batteries less often helps to reduce environmental impact. A CTEK charger will also save you time as the charger can be connected to the battery in seconds and the technology allows batteries to be charged quicker than with most conventional battery chargers.


Where safety is a concern CTEK chargers control the charging process to minimise potentially explosive gases given off when charging and utilise CTEK's own patented spark protection technology to remove risk of ignition. All the chargers are manufactured with a minimum of splash and dust proof covers and higher models feature a fully waterproof case. Top of the range models can be used outdoors, something which many conventional chargers are simply unable to cope with.

Dual Battery System


Vehicle batteries are charged by the vehicle’s alternator whilst the engine is running so when the engine is shut down the charging of the battery ceases. Running portable 12V appliances will draw power and reduce the power supply stored in the battery. This often results in flattening the starting battery which can then leave you stranded. Installation of a dual-battery system will help you overcome


Electric winches can drain significant amps from the vehicle battery quicker than an alternator can replace them so a dual-battery system can be set up so you can run the winch off both batteries.


Firstly, you should consider what 12V electrical items you expect to run from the dual-battery system and calculate how much power source (Watt hours) is required to run all the items and how long you want to run the items between recharges. It is recommended you then factor in about a 25-30% safety margin. This calculation will assist in deciding the amount of amp hour battery you need.


What parts are there to dual-battery system?

A dual-battery system consists of the two batteries with one termed as the ‘primary battery’ and the other the ‘auxiliary battery’, battery cradles, wiring for the discharging/charging system which integrates the vehicle’s electrical system and a battery isolator. An optional visual read-out device can also be placed in the cab of the vehicle for you to check on the battery charging or battery power storage level.


Power Inverters

If you wish to run 240V appliances such as a 240V TV or a laptop computer in your RV from a 12V system you will need to install an inverter. An inverter is an electrical device that converts 12V Direct Current (DC) from the batteries to 240V Alternating Current (AC). Invertors also draw their power from a 12V deep cycle battery or battery bank (several batteries wired in parallel).

As inverters produce 240V always exercise caution as it is as deadly as mains power.


Power inverters come in a range of models and sizes that vary in watts. If you just require power for say two lights, a radio and a small laptop computer then a 500W inverter connected to a 12V power socket may suffice but if you wish to use a larger laptop computer, DVD or TV and mobile telephone charger or a bread maker then a larger inverter would be necessary.

If you want the inverter connected into fixed wiring this work must be done by our licensed auto electricians

Some electrical appliances have a ‘start up surge’ or ‘peak load’ when turned on which is much higher than their continuous draw or ‘continuous load’ so the size/capacity of the inverter will need to cope with this.

Another example is if you wish to use tools such as an electric drill then the size/capacity of the inverter would need to cope with the drill under load. Adequate power stored in the RV battery bank would also be needed.