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How to choose a battery charger ?

In this article we want to showcase the different types of battery chargers so you can choose the product that better fits your needs.

The battery charger division is born with the goal of giving the market a wide offer of products to fulfill every battery charging, recovery, maintenance and start-up requirement.

Battery charger information scheme
  • 1 Voltages used to charge.
  • 2 The range of batteries that can be charged, in this case batteries from 30 to 200 Ah.
  • 3 If the device is a battery-booster, it shows the starting-up capacity in amps.
  • 4 - Arith - Average loading in amps. - Eff. - Maximum load capacity.
  • 5 The size of the charger.
  • 6 The weight of the charger without packaging.
  • 7 Input voltaje - Hertz (Europe 50Hz). Absorbed power.
  • 8 Recommended sales price (excluding VAT)

Battery types

There is a wide range of battery types, we will focus on the batteries used in motor vehicles, most of them fall into these categories :

  • LIQUID BATTERIES: All kind of charger.
  • GEL BATTERIES: Chargers with IU, IUOU curves.
  • DEEP CYCLE BATTERIES : Only chargers with the Deep Cycle charging program.
Batteries connected in parallel and in series

Knowing your battery

A How to know the charging power needed

Batteries are usually rated in Amps Hour (Ah), we will use this value to decide the charger we need. In this example we need a charger charging capacity above 56Ah, like the NOVACAR 10A, with a charging range between 20 and 120 Ah.

Connecting batteries in series and in parallel

B Battery voltage

C Amount of instant current that can be delivered by the battery (used for starting-up engines)

D Battery type : LIQUID, GEL, AGM

Battery charge curves

One step W curve

1 step W curve

  1. Charging intensity (I) gets lower as the battery current (V) grows.
2 steps WoW curve

2 steps WoW curve

  1. The first step is a W curve charge.
  2. When battery reaches 14,8V the charger stops.

    If current is below 12,6 the charger goes back to the first step.
2 step WoW Gel curve

2 step WoW Gel curve

  1. Starts with a W curve charge.
  2. Once the battery reaches 14,8V ( for liquid batteries) or 14,4V (GEL), the charger stops.

    If current gets below 12,6V (LIQUID) or 12,8V (GEL), the charger goes back to the first step.
Curva IU – 4 etapas con mantenimiento

4 steps IU curve with battery maintenance

  1. Using an initial slow charge, a battery recovery test is made until 10V are reached.
  2. Constant intensity battery charge until 14,8V (LIQUID) or 14,4V (GEL).
  3. The charging intensity is gradually decreased to achieve a 100% charge.
  4. Maintenance mode is started, keeping a constant current of 13,8V and the battery fully charged.
5 steps IUOU curve with pulsed maintenance

5 steps IUOU curve with pulsed maintenance

  1. Starts with a W curve charge.
  2. Constant current charge up to 14,8V ( for liquid batteries) or 14,4V (GEL).
  3. Charge intensity gradually decreased to achieve a 100% battery charge
  4. For Deep Cycle batteries, the charger outputs a greater current (15,5V) at a lower intensity (less than 2A) and for a limited amount of time (2h) in order to achieve full charges.
  5. Battery maintenance mode starts, battery chage is kept between 80% and 100%, The charger can be connected indefinitely keeping the battery at full health.