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Sunny Island
Battery states
Description
L4, L3, L2, L1
Reduced availability of the battery and increased battery aging
N4, N3, N2, N1
Normal working area with varying availability of the battery
O1, O2, O3
Overload
The eleven defined battery states allow the user to make switches according to the
battery state. The following table provides an overview of the different battery states
(BST), their meaning and recommendations for possible switching measures:
BST
Meaning
O3
Very high
overload
O2
High
overload
O1
Overload
N1
Very high se-
curity of sup-
ply
N2
High security
of supply
N3
Normal secu-
rity of supply
N4
Low security
of supply
L1
Increasing ag-
ing
L2
Strong aging
L3
Very strong
aging
L4
Destruction of
battery immi-
nent
Table 11.2: Battery states and recommended measures
BWRI33-12:EE
Table 11.1: Classification of battery states
Recommendations
Immediately stop charging
Drastically decrease charging
power
Decrease charging power
None
Notification of charge degree; if
required first reduction of con-
sumers
Either reduce consumption or
make sure battery is charged
soon
Either reduce consumption
drastically or make sure battery
is charged soon
Reduce consumption except for
emergency supply; initiate
charging, alarm message
Switch off all consumers, initiate
charging
Reduce internal consumption
immediately, initiate charging,
alarm message via switch-off
Immediately reduce internal
consumption, initiate charging,
alarm message via switch-off
- 114 -
Installation & Operating Instructions
Possible switching measures
Switch off all feeders via the fre-
quency
Slight increase of frequency to
switch off first PV inverters
Switch on dumpload
Switch off dumpload
Switch off first load groups that are
not continuously used or reduction
of power
Switch on dumpload soon or switch
off certain load groups
Switch on dumpload immediately
or switch off all load groups that
are not urgently required
Switch on dumpload immediately
or switch off all load groups except
for emergency supply
Switch on dumpload immediately
or switch off all external load
groups
Inverter into standby operation
Switch off inverter
SMA Regelsysteme GmbH
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