6 Electrical Connection
SMA Solar Technology AG
Operating manual
53
SI44M-80H-13-BE-en-15
2.
WARNING
Danger to life from electric shock due to incorrect insulation
In the case of faulty insulation, supposedly de-energized parts or cables may be live. Touching live components
or cables can result in death or serious injury due to electric shock.
• When making the following connections, always insert a silicone tube (see Section 6.6.5, page 60).
3. Connect the battery room fan to one multifunction relay on one Sunny Island of the main cluster.
4. Enter the configuration
Battery fan in Multicluster
in the table of settings (see Section 7.10.2, page 102).
6.5.16 Connecting the Electrolyte Pump for the Battery
The Sunny Island controls the electrolyte pump for the battery as follows:
• The Sunny Island switches on the electrolyte pump at least once a day.
• The Sunny Island switches on the electrolyte pump a maximum of nine times each day.
• When the battery has been charged to 10% of its rated capacity, the Sunny Island switches the electrolyte pump
on for five minutes.
Requirements:
☐ The technical requirements of the multifunction relay must be met (see Section 16, page 175).
Cable requirements:
☐ Conductor type: copper wire
☐ Conductor cross-section: 0.2 mm² to 2.5 mm²
Procedure:
1.
WARNING
Danger to life from electric shock due to incorrect insulation
In the case of faulty insulation, supposedly de-energized parts or cables may be live. Touching live components
or cables can result in death or serious injury due to electric shock.
• When making the following connections, always insert a silicone tube (see Section 6.6.5, page 60).
2. Connect the control cable of the acid circulation to a multifunction relay on the Sunny Island .
3. With a multi-cluster system, in each cluster, connect the control cable of the acid circulation to a multifunction
relay.
4. Enter the configuration
Electrolyte pump
in the table the settings (see Section 7.10.2, page 102).
6.5.17 Connecting the Control Cable for the Use of Excess Energy in an Off-Grid
System
Relevant for off-grid systems
If the battery can no longer take up excess energy in an off-grid system, the power output of the AC sources in the
stand-alone grid is limited by the Sunny Island. This means that the excess energy is not used. The Sunny Island allows
for the use of excess energy by means of a multifunction relay.
During the constant voltage phase, a multifunction relay is activated and thus controls additional loads that can put
any excess energy to good use. As a result of the utilization of excess energy, the Sunny Island has to limit the power
output of the AC sources in the stand-alone grid to a lesser extent.
