SMA
Technologie AG
Battery Management
Technical Description
SI5048-11:EE4206
Page 85
13 Battery Management
The battery management of the Sunny Island 5048 supports the following three battery
types ("#221.01 BatTyp" parameter):
FLA
F
looded
L
ead
A
cid: Closed lead acid batteries with liquid electrolyte in all
standard designs available on the market (grid plate, tubular plate, small,
large, etc.)
VRLA V
alve
R
egulated
L
ead
A
cid: Closed lead acid batteries with immobilized
electrolyte in gel or AGM (
A
bsorbent
G
lass
M
at Separator) in all standard
designs available on the market (grid plate, tubular plate, small, large, AGM,
Gel, etc.)
NiCd Ni
ckel
C
a
d
mium: Pocket-type plate or fiber plate closed nickel cadmium
batteries
The battery capacity ("#221.02 NomBatCpy" parameter) is to be entered as the
nominal capacity for a ten hour discharge (C10). If this is not available from the battery
manufacturer's data sheet, it can be calculated from the data for different discharge
times (120 h, 100 h, 20 h, 5 h, 1 h) in the following manner:
The Sunny Island 5048 is designed and preset for a nominal battery voltage ("#221.03
BatVtgNom" parameter) of 48 V (24 cells for every 2 V) with lead acid batteries (FLA
and VRLA) and 45.6 V (38 cells for every 1.2 V) with nickel cadmium batteries.
13.1 Battery Temperature
The Sunny Island 5048 continuously monitors the battery temperature using the
provided battery temperature sensor. A warning message is displayed once the battery
temperature drops 5 °C below the maximum permissible temperature ("221.04
BatTmpMax" parameter).
If the maximum permissible battery temperature is exceeded, the Sunny Island 5048
switches off with a fault. If the battery temperature then drops below the set limit
("#221.05 BatTmpStr" parameter), the Sunny Island 5048 restarts automatically.
When lead acid batteries drop –10 °C below the set limit and NiCd batteries drop –
20 °C below the set limit, a warning is displayed.
The battery temperature is taken into consideration when the charging voltage is
calculated (see section 13.4 "Charge Control" (Page 88)).
C10
C120/1.28
C10
C10
C10
C100/1.25
C10
C5/0.88
C10
C20/1.09
C10
C1/0.61
If individual battery cells fail over several years of continuous operation, the
nominal voltage can be set in the range from 42 V to 48 V. Up to three individual
cells can be removed and the system can still be further operated.
Summary of Contents for Sunny Island 5048
Page 22: ...The Sunny Island 5048 SMA Technologie AG Page 22 SI5048 11 EE4206 Technical Description...
Page 26: ...Safety Instructions SMA Technologie AG Page 26 SI5048 11 EE4206 Technical Description...
Page 94: ...Battery Management SMA Technologie AG Page 94 SI5048 11 EE4206 Technical Description...
Page 114: ...Connecting External Sources SMA Technologie AG Page 114 SI5048 11 EE4206 Technical Description...
Page 160: ...Contact SMA Technologie AG Page 160 SI5048 11 EE4206 Technical Description...
Page 169: ...SMA Technologie AG Glossary Technical Description SI5048 11 EE4206 Seite 169...
Page 171: ......