Sunny Island 4500
Installation & Operating Instructions
BWRI45-13-EE0304
- 28 -
SMA Regelsysteme GmbH
The eleven defined battery states allow the user to make switches according to the
battery state. How to define battery state dependent switching operations is shown in
Chapter 8.7. The following table provides an overview of the different battery states
(BST), their meaning and recommendations for possible switching measures:
BST
Meaning
Recommendations
Possible switching measures
O3
Very high
overload
Immediately stop charging
Switch off all feeders via the fre-
quency
O2
High
overload
Drastically decrease charging
power
Slight increase of frequency to
switch off first PV inverters
O1
Overload
Decrease charging power
Switch on dumpload
N1
Very high se-
curity of sup-
ply
None
Switch off dumpload
N2
High security
of supply
Notification of state of charge; if
required first reduction of con-
sumers
Switch off first load groups that are
not continuously used or reduction
of power
N3
Normal secu-
rity of supply
Either reduce consumption or
make sure battery is charged
soon
Switch on genset soon or switch
off certain load groups
N4
Low security
of supply
Either reduce consumption
drastically or make sure battery
is charged soon
Switch on genset also at night or
switch off all load groups that are
not urgently required
L1
Increasing ag-
ing
Reduce consumption except for
emergency supply; initiate
charging, alarm message
Switch on genset immediately or
switch off all load groups except
for emergency supply
L2
Strong aging
Switch off all consumers, initi-
ate charging
Switch on genset immediately or
switch off all external load groups.
Low battery load mode will auto-
matically be set at night.
L3
Very strong
aging
Reduce internal consumption
immediately, initiate charging,
alarm message via switch-off
Inverter into standby operation.
Low battery load mode will auto-
matically be set day and night
L4
Destruction of
battery immi-
nent
Immediately reduce internal
consumption, initiate charging,
alarm message via switch-off
Switch off the inverter
Sunny Island will go into standby
mode automatically
Table 2.2:
Battery states and recommended measures