The basic principle
The Mastervolt inverter is a high-quality electrical appliance with a built-in electronic circuit that converts 12V or 24V battery current into a stable 50Hz or 60Hz frequency. The inverter has two connection points: one for attaching the battery plus and minus cables and the other for the AC output current. The smaller models, with capacities of 250 and 500 Watt, are fitted with an external battery connection point and a plug for the AC appliance. Larger models are designed for fixed installation and are fitted with internal connections. All models can be fitted with standard or more advanced remote panels.

Permanent supply of AC power
As appliances become ever cheaper, an inverter is a very good investment. You must ensure, however, that you choose a long-lasting inverter with a pure sine wave output. Mastervolt inverters have an extremely long life-span and are fully safeguarded against short circuiting, overloading and high operating temperatures.

Batteries last longer then you think
Inverters do not ‘suck the life out of your battery’, as some people seem to think. Of course inverters used to be far from economical when they contained heavy transformers and low efficiency transistors. Yet Mastervolt’s specially developed high frequency technique changes all that: virtually no energy is wasted and many household appliances, such as 230 or 110V refrigerators and lights (energy-efficient bulbs!), are even more economical than their 12 or 24V equivalents. In other words: less Amperes from your battery.

Efficiency optimised
The Mass Sine range is fitted with an energy-efficient circuit which maintains a high output with partial loads and almost switches off in the standby (or search) wait mode, thus using up virtually no energy from the battery but still supplying AC power. There are four levels of energy saving modes:

This is an important advantage: low consumption devices like electrical clocks, digital radio’s and VCR's for example will continue to operate at this mode.

Masterswitch 0: the smallest switching system up to max. 5 kW, art. no. 55006010

High initial surge capacity
Many AC appliances need an extra surge of energy for starting, especially inductive appliances such as refrigerators, vacuum cleaners, dishwashers, TVs and some tools. Mastervolt inverters can easily cope with the required power surge. See below for a list of the nominal capacity and the initial surge capacity for each type of inverter.

Suitable for any electrical system
A Mastervolt inverter can be installed on any vessel with a separate service battery and starter battery. Try to estimate your consumption and operating time as accurately as possible. The service battery will have to be recharged occasionally, of course, and Mastervolt offers a range of options:

Inverters as an effective alternative to generators
Mastervolt’s rule of thumb is that up to a consumption of around 3kW, the AC power can be supplied by a Mass Sine (or Dakar) inverter. An inverter installation is silent, does not produce fumes, supplies high-quality current and uses energy sparingly. The inverter only produces the power that is actually required, as opposed to a generator which has to run continually. A Mastervolt inverter is therefore a very efficient addition to a generator system. The result: fuel economy, fewer engine hours and lots of silent hours on board.

Efficiency graph from a 500W Mastervolt sine wave inverter: a high efficiency mode is already achieved with a relatively low load.

	Inverter switched off: via remote control panel or on/off switch on the inverter itself.
	Inverter stand by/wait mode: minimal consumption from battery yet still supplying AC for small appliances. Switches automatically.
	Inverter on: supplying current from battery as required for connected 230V appliances. Energy consumption is 2W for small models and 6W for heavy duty units.
	There is an extra ‘low energy’ mode for reducing basic consumption by 10%. This is especially useful for small battery systems and for use with a solar panel.

Automatic switching system: inverter/shore power and/or AC generator

A few important points to remember when buying or installing.

Battery: be careful not to transpose the plus and the minus connectors.

AC outlet: The easiest method is to connect the AC appliance directly to the inverter outlet. Take care if you install the inverter in a system with a second AC power source (i.e. shore or generator power) - the inverter will be damaged if its outlet comes into contact with this second AC source. You can avoid this by fitting a Masterswitch, a small circuit box with three separate connectors: the AC input for shore or generator power, the AC input for inverter power, and the AC outlet for the onboard electricity. When shore power is available, the onboard system starts using it automatically and the Mass sine wave inverter is switched to wait-mode. If shore power is disconnected (or the generator switched off) the inverter automatically comes on.

Mastervolt’s range includes several versions of the Masterswitch. If you prefer to switch manually, opt for a bi-polar switch (art. no. 708020230).

Remote control panel, model C4-RI
An inverter is always placed as close to the service battery as possible in order to prevent voltage loss in the connection cables. It is often built in (always ensure sufficient ventilation for cooling) and difficult to reach for switching on/off and maintenance. That is why Mastervolt has developed a remote control panel, model C4-RI, with the following functions: switching the inverter on/off, ‘on’ indicator and ‘fault’ indicator. Possible faults include battery voltage too low, (accidental) overload (causes no damage to the appliance!), or a short circuit in the AC circuitry.

The following cables are available for connecting this panel: Art. no. 65-02-001030, 6-wired cable with telejack plug, length: 6 metres. Art. no. 65-02-100100, 6-wired cable with telejack plug, length: 10 metres. Art. no. 65-02-100150, 6-wired cable with telejack plug, length: 15 metres

Remote control panel, model C-4-RI Art.no. 70404110.