Freedom Lite Installation Manual Revision 12
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1 output is connected to the house circuits that require battery backup (with a Quattro the
AC 2 output can be connected to non-essential loads for automatic load shedding in a grid
outage). The 48V DC connections on Freedom Lite are connected to both the inverter and
the solar charge controller (SCC). There is also a BMS CAN Bus control connection between
the Freedom Lite and the Color Control system controller (a Venus controller can also be
used). Multiple inverter and SCC units can be installed in parallel and also in three phase
configuration.
Note that to comply with the legislation of your country it may be a requirement to include
an appropriate anti-islanding device between the grid supply and the inverter. The Victron
Multiplus and Quattro inverters do have a transfer switch that disconnects the grid from
back feeding when the grid power is down, but may not comply with local legislation. The
Multiplus II models are however approved in most countries for anti-islanding as they
contain upgraded anti-islanding equipment.
The inverter will within 20ms transfer power in the house to battery backup if the grid
power fails. This is sufficiently fast to prevent appliances from being affected. The unit can
also exclude most voltages spikes higher than a user adjustable value within a 20ms period.
Once transferred to battery power the inverter will continue to operate until the BMS
instructs it to stop on CAN Bus. This should only occur if the Freedom Lite has dropped to
10% SoC (90% DoD). The inverter will then not function off battery until either the solar
charge controller has recharged the battery to at least 20% SoC and will thereafter continue
to operate provided that the SoC remains above 10%. When grid power is restored the
inverter will immediately revert back to the grid source. The system design should be based
on assuming only 70 to 80% DoD will be used on a routine basis with 90% DoD being the
absolute cut-off for occasional scenarios.
The Victron Multiplus and Quattro inverters and the Blue Solar charge controllers are
connected to the Color Control or Venus. For grid connected systems the ESS assistant
should be installed on the Multiplus/Quattro. For off grid systems no assistants are required
on the Color Controller/Venus.
It is also possible to configure the Victron inverter to feed energy to the grid if the battery
voltage or SoC is above a defined value. This must be set up properly using the configuration
software and the connection must be authorised by the utility and any other applicable
body in your country.
Note that the above diagram is a simplification. In many household installations the inverter
may not be intended to run heavy consumers such as electric geysers, stoves and household
heating. These are often connected to the grid directly and do not pass through the inverter.
They could be connected to AC 2 output of the inverter for internal load shedding or to the
AC input with a grid meter for feeding to loads connected in the utility side.
It is also necessary to ensure that the AC output of the inverter is fed to either a separate
Distribution Board (DB) or to a section of the main DB that is physically apart from the
incoming utility supply and the other breakers that are fed from the utility directly. This is to
