6 Electrical Connection
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
54
Use of excess energy
The energy source of an off-grid system is PV energy. On days with high solar irradiation and low power consumption,
the battery cannot take up all of the PV energy during the constant voltage phase. In order to utilize the excess energy,
the Sunny Island activates the control of a pump that pumps water into a container for subsequent use.
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 for the utilization of excess energy to the multifunction relay on the Sunny Island .
3. Enter the configuration
Control of add. loads
in the table of settings (see Section 7.10.2, page 102).
page 102) and set the utilization of excess energy in off-grid systems (see Section 7.7, page 86).
6.5.18 Connecting the Signal Cable of the External Generator Request
Relevant for off-grid systems
An external control signal can transmit a generator request to the generator management. If you have configured the
generator management for the external generator request, the generator management starts the generator if there is a
high level present. The generator management stops the generator if there is a low level. As a result, all generator run
times are complied with.
SUNNY ISLAND
+
_
BatVtgOut
+
_ DigIn
EXTERNAL GENERATOR
REQUEST
Figure 14: Connection of the control cable of an external generator request (example).
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
