Sunny Island
Installation & Operating Instructions
BWRI33-12:EE
- 125 -
SMA Regelsysteme GmbH
Emergency operation
In case of a flat battery in a purely PV-supplied island grid (battery state L4) the
Sunny Island has an operating mode enabling it to make the AC grid available to
feeders nonetheless. In this mode the inverter generates the grid voltage for a few
minutes every four hours over the day and detects whether there is enough feeding
power to charge the battery. This is an effective way to avoid a long-term total shut-
down of the system even under the worst conditions.
Required parameter settings
The installer has to set the parameters of the Sunny Island listed in Table 13.2. The
values are of course only examples. The configuration is based on the assumption
that the consumers that can be disconnected are controlled via relay K4.
Parameter Configuration
Description
501_Cbatnom
350 Ah
Nominal capacity of the battery (as stated by the manufac-
turer)
502_Bat Type
Lead acid
Depending on type (gel, fleece or liquid)
503_Ubat nom
60.0 V
Nominal battery voltage
506_acid density
1.28 kg/l
Nominal acid density of electrolyte
401_Phase Mode
1Phs_Single
Single-phase operation
402_Uconv nom
230.0 V
Nominal voltage AC (RUN_U)
403_Fconv nom
50.00 Hz
Nominal frequency AC (RUN_U)
704_Man K4
AUTO
Relay K4 is controlled by the Sunny Island system manage-
ment
728_K4 t2 begin
0h
No special time period for relay K4
729_K4 t2 end
0h
No special time period for relay K4
730_K4 On t1
N4
After the value has fallen below L1, consumer is only switched
on again when the battery state has reached N4 (rising)
731_K4 Off t1
L1
Consumer is switched off when battery state L1 has been
reached (falling)
801_Sunny Boys
Installed
Installed
Table 13.2: Summary of parameters to be configured
To monitor the battery temperature a Pt100 temperature sensor has to
be connected to the Sunny Island!
