Installation
48
zappi
operation and installation manual
Battery Storage Systems
AC Coupled
Where there is an AC coupled battery storage system, there can be a conflict as both the storage system and the
zappi
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
zappi
or
harvi
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 27). Also refer to
Supply Grid – Network Settings – Battery
(page 28
26
) 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
zappi
. 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
27
).
Third-Party Diverters
Some properties have a third-party energy diverter installed and you may want the
zappi
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
myenergi
device or use a
harvi
if a
wireless connection is needed.
Configure the CT Type as Storage Only. See CT Config (page 29
27
) for details of how to configure CTs.
Voltage Optimisers
If there is a voltage optimiser (VO) installed in the property, the CT sensor and the
zappi
must both be on the same
side of the VO; either the incoming grid supply or the optimised supply.