Connecting The Control Cable For The Electrolyte Pump Of The Battery; Connecting The Control Cable For The Use Of Excess Energy - SMA SUNNY ISLAND 8.0H Installation Manual

SMA Solar Technology AG
6.26 Connecting the Control Cable for the Electrolyte Pump of the
Battery
The off-grid inverter controls the electrolyte pump for the battery.
• The off-grid inverter switches on the electrolyte pump at least once a day.
• The off-grid inverter switches on the electrolyte pump nine times a day at the maximum.
• When the battery has been charged to 10% of its rated capacity, the off-grid inverter switches
the electrolyte pump on for five minutes.
If the battery acid is circulated via an electrolyte pump, connect the acid circulation control as follows:
1. Connect the acid circulation to the multi-function relay (see Section 6.18 "Assignment of Multi-
Function Relay", page 54).
2. For a multicluster system, repeat step 1 for every cluster.
3. Enter the function of the multi-function relay used in the configuration table
(see Section 7.10.1 "Use of the Multi-Function Relays", page 90). Note the AcdCir value.
6.27 Connecting the Control Cable for the Use of Excess Energy
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 off-grid inverter. The excess energy is then not used.
The off-grid inverter allows for the use of excess energy by means of a multi-function relay.
During the constant voltage phase, a multi-function relay switches to the NO position and thus controls
additional loads that can put any excess energy to good use. As a result of the utilisation of excess
energy, the off-grid inverter has to limit the power output of the AC sources in the stand-alone grid less.
Example: Utilisation 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 float charge. In order to
utilise the excess energy, the off-grid inverter activates a pump that pumps water into a container for
subsequent use.
If you are utilising excess energy, connect the control cable for the utilisation of excess energy as
follows:
1. Connect the control cable for the utilising of excess energy to the multi-function relay
(see Section 6.18 "Assignment of Multi-Function Relay", page 54).
2. Enter the function of the multi-function relay used in the configuration table
(see Section 7.10.1 "Use of the Multi-Function Relays", page 90). Note the ExtPwrDer value.
Installation Manual
6 Electrical Connection
SI80H-60H-OffGrid-IA-en-11 65