PowerBox Systems PowerBox Cockpit SRS Instruction Manual page 6

Your PowerBox stores the last switched state (on or off). That means:
if the backer is switched off using the SensorSwitch, it stays switched
off.
Once switched on, the backer can only be turned off again using the
switch unit. Intermittent contacts or interruptions in the power supply
cannot cause the backer to be switched off.
3.3. Main screen display
When switched on, the unit's integral screen shows this display:
Key to the individual display points:
- Digital voltage display:
This extremely accurate display allows you to read off the voltage of
the battery directly, i.e. the voltage which is present at the input of the
PowerBox.
- Graphic voltage display:
A brief glance into the model provides you with information about the
batteries' state of charge. This display is always correct for the type of
battery you have selected. This means that the bar will extend right to
the top of the box if the connected battery is fully charged - assuming
that you have set the correct battery type. If the bar only fills the
bottom third of the box, then the corresponding battery is almost flat.
This indicator is supplemented by the residual capacity display.
- Residual battery capacity:
This display shows the momentary capacity value of the battery -
again, assuming that you have previously set the battery type
correctly. This display is capable of providing very accurate
information about the remaining battery capacity, although ageing
effects or defective batteries may falsify the value. In practice this
means that you should always take both values into account: if the
remaining capacity appears to be high, but the voltage has already
fallen to a low level, you should consider it an urgent necessity to
check the battery more closely.
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