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5.3.1.2 Usage and calibration of battery charge display
Having entered the battery information in the setup-menu, the on-board computer now
knows the capacity of the battery bank. When the motor is in use, the on-board com-
puter measures the consumed power and determines the remaining battery charge in
percent and the remaining range based on the current speed.
The calculation of the remaining range takes into account the fact that lead-based
batteries do not provide their full capacity at higher electrical currents. Depending on
the battery used this effect may result in the battery charge indicator showing a relatively
high charge level in percent but the remaining range at full throttle is very low. By mo-
ving slower you can still use the available battery charge.
To use the indicator of the battery charge status and remaining range in your Cruise, your
assistance is required in two ways:
1. Whenever you start a journey with fully charged batteries the computer has to be
calibrated. To do so press the “cal” button in the center of the display before the
journey begins. The display shows the value 100% for the charge level. To confirm the
value and exit the calibration menu press the “cal” button again.
As deep discharges of lead-based batteries adversely affect the lifespan of the batte-
ries, we recommend starting a journey whenever possible with fully charged batteries.
When you switch the motor on without having charged the batteries since the last use
(e.g. when pausing the journey or after a very short journey) the on-board computer
uses the most recently saved charge level and calculates the subsequent charge levels
and range from that point.
If you have partially charged the batteries the on-board computer falsely assumes the
most recent charging level and under-estimates your charge and range.
2. At the beginning of each season the on-board computer has to be calibrated in order
to take into account the aging of the battery bank. To do so use the fully charged
battery bank on your boat and deplete it to the point where the remaining range
shown on the display is less than 5 km (approx. 3 miles). In order to obtain a proper
calibration, the motor should not draw more than 400 watts out of the battery bank
for at least the last hour. If the conditions stated above are met (1 hour’s operation
at 400 watts or less and remaining range less than 5 km / approx. 3 miles) the motor
switches off automatically. Therefore, you can conveniently execute the calibration
procedure for example while the boat is tied up in port; please note that the main
switch is not switched off automatically when the motor stops. This needs to be done
manually after the motor stopped.
The capacity in percent and the remaining range can only be displayed after completing
the setup and after the first calibration (entering the charge level, see capter 5.3.3.2).
Display example in normal operation
when setup has not been completed:
Display example in normal operation
Battery voltage
Can not be represented
Speed
Input power consumption
Battery charge status
Remaining range at
current speed
Speed
Input power consumption