SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.
SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.
SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.
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SMA Solar Technology AG Battery Management<br />
13 Battery Management<br />
The battery management of the <strong>Sun</strong>ny Island supports the following three battery types<br />
("221.01 BatTyp" parameter):<br />
• FLA<br />
• VRLA<br />
• NiCd<br />
The battery capacity ("221.02 BatCpyNom" parameter) is to be entered as the nominal capacity for<br />
a ten hour discharge (C10). If this is not available from the battery manufacturer's data sheet, it can<br />
be calculated from the data for different discharge times (120 h, 100 h, 20 h, 5 h, 1 h) in the<br />
following manner:<br />
C10 C120/1.28 C10 C10<br />
C10 C100/1.25 C10 C5/0.88<br />
C10 C20/1.09 C10 C1/0.61<br />
The <strong>Sun</strong>ny Island is designed and set by default (parameter "221.03 BatVtgNom") for a nominal<br />
battery voltage:<br />
• 48 V (24 cells at 2 V each) in the case of lead batteries (FLA and VRLA)<br />
• 45.6 V (38 cells at 1.2 V each) in the case of Nickel-Cadmium batteries<br />
Failure of individual battery cells<br />
If individual battery cells fail over several years of continuous operation, the nominal<br />
voltage can be set in the range from 42 V to 48 V (see 8.2 ”Starting the Quick<br />
Configuration Guide (QCG)” (page 57)). Up to three individual cells can be removed and<br />
the system can still be further operated.<br />
13.1 Battery Temperature<br />
The <strong>Sun</strong>ny Island continuously monitors the battery temperature using the battery temperature sensor<br />
provided. At 5 °C under the maximal temperature allowed (set using the parameter<br />
"221.04 BatTmpMax"), a warning is displayed. If the maximum value for the battery temperature is<br />
exceeded, the <strong>Sun</strong>ny Island switches off.<br />
A warning is output if the value for lead-acid batteries falls below –10 °C for below –20 °C for NiCd<br />
batteries.<br />
The battery temperature is taken into consideration when the charging voltage is calculated (see<br />
section 13.4 ”Charge Control” (page 99)).<br />
<strong>Technical</strong> <strong>Description</strong> SI<strong>5048</strong>-TB-TEN110340 97