SMA Solar Technology AG
Battery Management
Technical Description
SBU2200-TEN083320
123
16 Battery Management
The battery management of the Sunny Backup 2200 supports the following three battery types
("221.01 BatTyp" parameter):
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 Backup 2200 is designed and preset for a nominal battery voltage ("221.03 BatVtgNom"
parameter) of 24 V (12 cells with 2 V each) with lead acid batteries (FLA and VRLA) and 22.8 V (19
cells with 1.2 V each) with nickel cadmium batteries.
16.1 Battery Temperature
The Sunny Backup 2200 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).
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 16.4 „Charge Control“ (125)).
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
C10
C120/1.28
C10
C10
C10
C100/1.25
C10
C5/0.88
C10
C20/1.09
C10
C1/0.61
