M300 CTEK Charger
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CTEK M300 Marine Battery Charger

£182.97 ex. VAT

£214.99 inc. VAT


CTEK M300 General Information

The CTEK M300 (25A) is a powerful and complete 8-step, fully-automatic, switch mode battery charger package for dual battery banks, which analyses, charges and maintains all types of boat batteries.

The M300 kit comprises of two chargers:

The first charger, the M300 STARTER is designed for charging the engine starting battery or batteries. As engine starting batteries normally only get used for very short periods, the M300 starter is relatively small, effectively a marine version of the XS800. This means the charger can easily be tucked away neatly within the engine compartment. The M300 STARTER comes with a comfort connector, plus interchangeable crocodile clips or permanent attachment leads.

The main charger within the M300 kit is a very high capacity unit, capable of charging and maintaining batteries up to 500Ah at a charge rate of up to 25A. The charger itself connects permanently to the battery via heavy duty hard wire cabling, which also includes a temperature sensor so that the charger can adjust the charge rate depending on the battery temperature. The high charge rate and capacity of the charger allows it to quickly and efficiently recover domestic system batteries, which often tend to get heavily discharged during periods moored away from mains power.

CTEK M300 Specification

  • Input voltage AC 220-240VAC, 50-60Hz
  • Output voltage Nominal: 12V
  • Efficiency 85%
  • Charging voltage 14.4V, Temperature compensated
  • Charging current 25A max
  • Back current drain* <2Ah per month
  • Ripple** <4%
  • Ambient temperature -20°C to +50°C, output power is reduced automatically at higher temperatures.
  • Cooling Fan
  • Type of charger Eight step, fully automatic, switch mode with pulse maintenance.
  • Type of batteries All types of 12V lead-acid batteries (Wet, MF, AGM, Calcium/Calcium and GEL).
  • Battery capacity 50-500Ah
  • Dimensions (L x W x H) 235x130x65mm
  • Insulation IP 44 (Outdoor use)***
  • Weight 1.4kg

*) Back current drain is what drains the battery if the charger is connected without the power cord connected.

**) Ripple denotes the amount of interference there is to the current and voltage. A high current ripple heats the battery and shortens its life. A linear charger has a current ripple of 70 - 400% which is much larger than the maximum 5% for a modern sealed battery. Voltage ripple could harm other equipment, which is connected to the battery.

The M300 delivers voltage and current with very low ripple. The battery gains a long service life and there is no risk of damage to other electronic devices connected to the battery.

***) IP 44 cannot be guaranteed unless the charger is positioned with its top or long side facing up.

For the technical data of the M300 starter, please see the XS 800.