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Hertz (Hz)

Unit that measures frequency, i.e. the number of times per second that an

alternating current (AC) changes direction. In Europe this is 50 Hz, and in the

USA 60 Hz.


High-frequency (HF) switch technology

This technology allows incoming alternating current to be rectified into direct current over

a diode bridge. The resulting DC voltage is chopped into parts with a high frequency by

means of an electronic switch that is turned on and off quickly. This creates a simulated

alternating current with a high frequency, 35 kHz (35,000 Hertz) for instance. This AC can

be converted to a higher or lower voltage via a very small transformer. The higher the

frequency, the smaller the transformer can be. Mastervolt uses HF switch technology in

all its equipment, offering major benefits in terms of compactness, weight and efficiency.

Another advantage is that you say goodbye to the irritating hum of a transformer.


Hydrogen gas

Highly explosive gas mixture of hydrogen and oxygen formed during the charging of

flooded batteries with an unsuitable charger. Extra ventilation prevents concentrations

from becoming too high.


IEC approval

The International Electrotechnical Commission (IEC) is headquartered in

Geneva, Switzerland, and develops general standards for the safety of

electrical components and equipment. Although it proposes standards, the IEC is not

responsible for their enforcement, which is usually carried out by independent test




The power intake of the battery charger

can be regulated via the system panel,

up to the point where the maximum

for the AC fuse has been reached. The

advantage of this system is that heavy-

duty consumers such as hair dryers are

powered via the inverter and cannot

therefore overload the AC fuse. When

such consumers are connected to the

inverter, consumption from the batteries

is usually higher than the battery charger

can supply. This is rarely a problem

as major consumers are usually used

for a short time and the consumption

measured in Ah tends to be low. After

the consumer has been switched off the

battery charger will recharge the battery




The number of times per second that

alternating current changes direction,

expressed in hertz (Hz).


Galvanic isolation

A situation where two circuits

are electrically connected

without their grounding or earth coming

in contact. Galvanic isolation is best

achieved by means of a transformer.


Gas voltage

The voltage level at which a battery

starts producing gas. At at an ambient

temperature of 20 ºC, the gas voltage is

2.4 V per cell or 14.4 V for a 12 V battery

and 28.8 V for a 24 V one.


Gel battery

Batteries where the electrolyte (mix of

water and sulphuric acid) is absorbed in

a gel. As they are entirely maintenance-

free and rarely produce gas, Gel batteries

can be fitted anywhere. Extra gas

extraction is not necessary. Gel batteries

are highly suitable for lighting and as

onboard service batteries, and can be

charged very quickly thanks to their

special construction. With normal use

the lifespan of a 12-volt Gel battery is

between six and seven years. For the 2

volt traction Gel version, 15 years is not

uncommon. A Gel battery is very suitable

for (deep) cycle usage.