•
Instead of a cable modem you could order a GSM modem as well. With this modem you are
complete independent to any infrastructure
•
The TarCom version ETN can be integrated into an Ethernet computer network.
4 Functioning
The System-Manager monitors the charge status of the battery, regulates the charge process as well as it
switches the loads on -off in order to make full use of the battery and to extend its life.
On delivery, the system is set for use with lead accumulators (batteries) with liquid electrolyte and can be
set for accumulators with fixed electrolyte like gel batteries. The System-Manager can be used for all
types of solar modules.
4.1 General Description
The System-Manager is an intelligent System-Manager in which a microprocessor has been employed for
all regulating, controlling and indicating functions. The main power switching components consist of low-
loss MOSFET type-transistors that have a long operating life and guarantee high performance due to their
excellent conductivity, thus leading to a low degree of internal heat generation in the System-Manager.
The customer can configure all parameters without opening the System-Manager or adjusting the
electronic components. Due to the unique feature of the System-Manager to send and receive data
transmission via the power cable itself, a minimum number of extra sensor and data cables is required.
The System-Manager is therefore easy to install even for a person without technical education, and errors
caused by defective cables or sensor wires are greatly reduced.
The overcharge protection is accomplished by a pulse-width modulation parallel (shunting type) controller
which is equipped with a MOSFET switch element and with a reverse diode in order to prevent current
flowing back from the battery to the module at night. While following the standard IE curve, the charging
process is also adjusted according to the temperature. Moreover, the history of the battery’s depth of
cycling over the last few days itself also determines a temporary limitation on excess final charge voltage
and also limits the time of boost of equalizing charges. Voltage drops of the battery cabling and
connections and due to the internal resistance of the battery itself are compensated automatically in the
sophisticated patented software inside the System-Manager, without using extra sensor cables.
In order to protect the battery from being totally discharged, the loads are automatically disconnected
from the battery under certain conditions. The System-Manager’s microprocessor determines the
remaining capacity at which no more consumption is possible without damaging the battery and shuts off
the loads if the remaining capacity in the battery falls below this limit. Furthermore, the loads are switched
off in the case of excess current or temperature for the protection of the System-Manager, and in the case
of excess voltage for the protection of the loads, and in the case of low voltage for the protection of the
battery.
The integrated temperature compensated equalisation charge function automatically does preventive
maintenance on the battery from time to time via electrolyte circulation (controlled gassing) and increases
battery life by preventing harmful acid or sulphate layers. This increase in the final charge voltage is time-
triggered after the battery has reached a certain level of voltage in normal charging. After this equalisation
charge time is completed, the System-Manager returns to normal charging. In addition, equalisation
charging enables a faster full charging during bad weather periods e.g., in winter, as only part of the
energy is need for gassing, whereas the remaining energy can be used for fast charging. This timed
equalisation charge function is activated by either undershooting of a determined SOC, or by exceeding a
certain period of time after the last equalisation charge. Equalisation charging can also be activated
manually.
An LCD display indicates important information on the current operating status. The first line informs
briefly on the most important basic parameters and the second line displays fine parameters or system
information. This displays are changing their information every three seconds.
The System-Manager has a reverse battery protection and is secure against no-load operation and short
circuit. The load output is protected against over-current. However, it is very likely that the System-
Manager is damaged if components are not connected to the correct terminals (e.g. if battery is
connected in reverse polarity to the module input terminals).
7
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