SMA SUNNY ISLAND 8.0H - Setting the Control of the Battery-Room Fan; Setting the Use of Excess Energy

SMA Solar Technology AG 7 Commissioning
Installation Manual SI80H-60H-OffGrid-IA-en-11 97
7.10.8 Setting the Control of the Battery-Room Fan
If you wish to control a battery-room fan, set the multi-function relay as follows:
1. Switch to installer mode (see Section 7.5).
2. Select the 221.04 BatFanTmpStr parameter and set it to the battery temperature at which the
fan is to be switched on.
3. Ensure that the multi-function relay used for control is set to BatFan or MccBatFan
(see Section 7.10.2).
4. Ensure that the battery room is sufficiently ventilated in the event of malfunctions – for example,
failure of the multi-function relay.
7.10.9 Setting Utilisation of Excess Energy
Figure26: Switching-on time and switching-off time for utilisation of excess energy during float charge as a
function of the cell voltage of the battery
The off-grid inverter controls the utilisation of excess energy during the constant voltage phase
depending on the cell voltage of the battery. During the constant voltage phase, the battery is
charged with a constant charging voltage. In the energy-saving mode, the multi-function relay is in the
NC position.
If the target value for cell voltage is reached in the constant voltage phase, the multi-function relay
switches to the NO position. The multi-function relay stays in this position for the minimum time of
241.07 ExtPwrDerMinTm. If the cell voltage differs by more than the voltage difference of
241.08 ExtPwrDerDltVtg after the minimum time, the multi-function relay switches back to the NC
position. The target value of the cell voltage depends on the charging process during the constant
voltage phase.