SMA S Technical Description page 41

SMA Solar Technology AG
The necessary air volume flow for ventilation of the room which accommodates the batteries is
calculated as per EN 50272-2 under the following assumptions:
• Nominal battery voltage = 24 V
• Battery type: closed lead acid batteries (VRLA)
• Max. charging voltage = 2.4 V/cell
as follows:
Q = 0.0048 x C [m³/h]
10
with C as the 10 hour nominal capacity in [Ah].
10
The cross-sectional area of the ventilation inlets and outlets is calculated according to the following
formula:
2
A = 28 x Q [cm ]
In the area near the battery, it is not always ensured that the explosive gases are sufficiently diluted.
For this reason, a clearance distance is to be observed in which no equipment which causes sparks
or smoldering is permitted.
The clearance distance is calculated as follows:
1/3
d = 5.76 x (C ) [cm]
10
The following table provides the required air
volume flows, ventilation cross-sectional areas and safety clearances for various closed lead acid
batteries (gel and AGM batteries).
Battery capacity [Ah] Air volume flow for
100 Ah
142 Ah
284 Ah
426 Ah
Technical Description
room ventilation
[m³/h]
0.48 m³/h
0.68 m³/h
1.36 m³/h
2.04 m³/h
Ventilation cross-
sectional area for
natural air inlet and
air outlet [cm²]
13 cm²
19 cm²
38 cm²
57 cm²
SBU2200-TEN083320
Mounting
Clearance distance
[cm]
27 cm
31 cm
38 cm
44 cm
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