AC Coupled
Where there is an AC coupled battery storage system, there can be a conflict as both the storage system and the
are competing to consume the surplus energy. Whilst this is not necessarily an issue, the results can be
somewhat unpredictable.
There is the option to add an additional CT sensor to monitor the battery storage. This will give control as to which
device has priority. The additional CT sensor should be wired to one of the CT terminals in the or device
(if wireless measurement is required). This CT should be clipped around the live cable of the battery inverter with the
arrow on the CT pointing away from the battery and towards the consumer unit/fuse board.
During the setup process it will be necessary to change the setting for the appropriate CT to AC Battery; refer to CT
Config (page 24). Also refer to Supply Grid – Network Settings – Battery (page 23) for information on setting the
'priority' of battery systems.
DC Coupled / Hybrid
Battery systems that charge directly from the solar array and cannot charge from AC are usually referred to as being
DC coupled or Hybrid. This type of battery system uses the solar PV inverter to provide power from the batteries,
thus it is not possible to differentiate between solar and battery power when using a CT to measure the AC current
from the inverter.
Because of this limitation, there are less options for managing the surplus power with this type of battery system. It
is usually possible to give priority to the battery by setting an Export Margin in the . A setting of 50W or 100W
is recommended. The Export Margin setting is found in the Advanced Settings/Supply Grid menu (See Export
Margin on page 24).
Some properties have a third-party energy diverter installed and you may want the to take priority (when
consuming surplus power) over the diverter. This is possible by installing an extra CT to monitor the diverter. The CT
should be clipped around the Live cable of the supply feeding the diverter. The arrow on the CT should be pointing
away from the diverter (towards the consumer unit). Wire the CT to the nearest device or use a if a
wireless connection is needed.
Configure the CT Type as Storage Only. See CT Config (page 24) for details of how to configure CTs.
If there is a voltage optimiser (VO) installed in the property, the CT sensor and the must both be on the same
side of the VO; either the incoming grid supply or the optimised supply.
