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Sunny Island
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
501_Cbatnom
350 Ah
502_Bat Type
Lead acid
503_Ubat nom
60.0 V
506_acid density
1.28 kg/l
401_Phase Mode
1Phs_Single
402_Uconv nom
230.0 V
403_Fconv nom
50.00 Hz
704_Man K4
AUTO
728_K4 t2 begin
0h
729_K4 t2 end
0h
730_K4 On t1
N4
731_K4 Off t1
L1
801_Sunny Boys
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!
BWRI33-12:EE
Installation & Operating Instructions
Description
Nominal capacity of the battery (as stated by the manufac-
turer)
Depending on type (gel, fleece or liquid)
Nominal battery voltage
Nominal acid density of electrolyte
Single-phase operation
Nominal voltage AC (RUN_U)
Nominal frequency AC (RUN_U)
Relay K4 is controlled by the Sunny Island system manage-
ment
No special time period for relay K4
No special time period for relay K4
After the value has fallen below L1, consumer is only switched
on again when the battery state has reached N4 (rising)
Consumer is switched off when battery state L1 has been
reached (falling)
Installed
- 125 -
SMA Regelsysteme GmbH
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