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8.6.3
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
. Also refer to
Supply Grid – Network Settings – Battery
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.
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 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.
Summary of Contents for zappi
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