4.2.4 Voltage Determination
Due to a special measuring method, battery sensor wires are no longer needed. The drop in voltage on
the battery cable is compensated after the first full charge process. This is why no further sensor or wiring
is needed, the installation is simplified, and the reliability of the system is increased due to the fact that
sensors and wiring cannot break. However, measurements may not be as precise as with sensor wires.
We would like to mention that – for a temperature coefficient factor of approx. 25mV per 1°C (changing of
the final charge voltage with the ambient temperature within the 12V system) – a tolerance of 100mV
corresponds to a temperature deviation of 4°C. There are no negative influences on the battery charging
curves with such low deviations.
4.2.5 Energy Determination
The energy determination (SOC and Current readings) are calibrated on the lower energy range so within
the maximum currents possible there may be deviations from an accurate electronic test meter. Please
remember that this System-Manager is not a measuring device, but we have put these indications for
your convenience.
4.2.6 Boost Charging (Lead&Sealed) And Equalisation Charging (Only Lead)
For this charging cycle, the System-Manager increases the battery charge voltage for a certain period of
time after the battery has fallen below a certain SOC. The Boost Charge countdown is only activated
when the desired battery voltage has been reached. This is the reason why it is important to pay attention
to the fact that the solar module will be able give out sufficient charge energy with the corresponding final
voltages.
You can manually activate the time limited boost charging.
If the Boost Charge voltage level is too high in comparison with the module voltage (reduced by wire
losses) the countdown may never be started and your battery is therefore charged at a higher
voltage with no time control.
Equalizing charge works similar to the above Boost Charging but is at an even higher voltage. Using
equalisation charging is only possible and can only then be programmed if the battery has been
configured to be of liquid electrolyte type. It is activated when the battery falls below a certain SOC status
4.2.7 Automatic Monthly Mixture Of Electrolyte
Batteries that are shallow cycled will never trigger the equalisation cycle, so an automatic function has
been added so the final charge voltage is increased for a limited time every month. In this case, either
Boost or Equalise charging is activated depending on the electrolyte configuration. This function prevents
harmful acid layering which occurs especially after remaining a long time at a certain charge status.
4.2.8 Display
A double-line liquid crystal display (LCD) informs the user about important system parameters using
various digital readouts. The first line of the LCD indicates SOC, battery voltage, load current and
charging current in approximated “rough” values.
The second line scrolls through various information and system parameters and current status with more
detailed values and descriptions.
The LCD works correctly only within the operating temperature range specified by the manufacturer.
When this temperature range is exceeded, disturbances may occur which prevent reading the display.
The display will return to normal when the operating temperature range is again reached. The storing
temperature range, however, must not be exceeded or permanent damage may occur.
4.2.9 Overdischarge Protection
Overdischarging leads to sulphation and as result a loss of your battery’s capacity. The overdischarge
protection feature disconnects the loads if the battery is becoming too discharged and re-connects them
after sufficient re-charging. The loads can also be manually switched on/off, so the System-Manager can
be used as a main DC load disconnect switch.
If the battery voltage falls under a certain voltage, the loads will be switched off, regardless of whatever
values or manual adjustments have been programmed. (emergency cut-off)
The System-Manager is able to be converted into voltage regulation. After this configuration all values are
able to program with voltage values. The discharge protection is now based on voltage and no longer on
SOC which represent the acid density much better than voltage levels.
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