As important as monitoring of voltage and currents in the electrical system, it can not provide a reliable indication of the charge level of the battery. For this purpose, please use battery monitoring computer.
Unfortunately, it is physically impossible to determine the charge state of a battery in operation with one voltmeter – the current flowing distorts the results. The battery manufacturers insist that the battery is “resting” 24 hours before measuring, that is, neither charging nor discharging. A voltmeter is therefore rarely useful. Relatively, so-called battery computers determine the charge state. These devices measure all currents flowing into and out of the battery and calculate the residual capacitance remaining,on ships and boats they are called marine battery monitors.
A battery monitor which, when the discharge voltage is reached, disconnects all consumers from the battery and only switches on again at a minimum voltage, reliably prevents the battery from being damaged by the forgotten light in the WC.
The AC-Monitor ACM shows all interesting values of the AC-voltage network (AC) on board. As soon as the alternating voltage is applied to the measuring transducer, the current voltage, the frequency and the flowing current are displayed on the display or battery monitor. The integrated alarm function constantly monitors the values of current and voltage.
The built-in buzzer gives the AC monitor alarm as soon as one of the monitored values leaves the set range.
The supply voltage of the measuring transducer necessary for operation is obtained directly from the voltage to be measured.
With a digital PBUS system, consumers are secured and switched using power modules distributed in the yacht. The classic cabling of control to the respective consumers no longer exists. Due to the digital control, the fixed switch consumer connection is canceled, since the assignment can be changed at any time by the software. Thus, for example, A load has a possibility to be switched off from a plurality of points or a switch can also switch several loads without the need for additional lines to be drawn. This allows for new versatile comfort functions, e.g. The remote switching of consumers or alarm functions. The E-T-A power bus nodes are based on a CAN bus technology (SAE J 1939), which has been optimized for marine and truck applications and is the basis for the NMEA 2000 protocol. Each power output is capable of switching, dimming and combining the associated load with timer functions.
It is also recognized whether the load line is short-circuited or a cable break is present. Each channel can be individually adjusted via software. The configuration software runs on any Windows-based PC and it enables a good marine battery monitoring. The complete system configuration is permanently stored on each PowerBus node. An outstanding safety feature is the emergency function by switching over the circuit breakers, which can be used to bypass the circuit manually. Thus, in the event of a total failure, consumers can be put into operation at any time.