Last update: 2019-05-05 13:16
battery_compatibility:freedomwon https://www.victronenergy.com/live/battery_compatibility:freedomwon
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Printed on 2019-05-07 10:25
in the specification sheet for each respective model. For multiple units in parallel, the kVA rating for
every Lite in the system may be summed to provide the total allowable inverter installed power.
Further to above, the Lite should be sized so as to provide adequate energy capacity in kWh to meet
the load demands of the system and to receive most of the excess solar generation each day (for self-
consumption installations).
Note: It is not permissible to install an inverter larger than stated in the Lite specification sheet
regardless of whether the “Limit DC Discharge Power” ESS feature in the Venus device is used. For
instances where the grid is not available this power limiting feature will not operate and the battery
could thus be overloaded, causing it to trip. The Lite will also not be able to limit discharge power in
the absence of a grid connection. Lastly, the Lite contains a protection circuit breaker that is only
rated to handle the power-up inrush current of the inverter for up to the capacity stated in the
specification sheet.
Operating Philosophy
The Freedom Lite transmits, amongst others, the following messages to the Venus device:
Adaptive Maximum Charge Voltage Setpoint – the value transmitted varies from 54.1V to 55.8V
1.
depending on the state of balancing on the particulate Lite. Typically a well-balanced Lite
battery will request a maximum charge voltage of between 55.0V and 55.8V. This advanced
feature is only available from Freedom Won and allows superior system control and optimal
battery management. The Venus device uses this setpoint to control the real time operating or
target voltage of the inverter/charger devices and the MPPT’s.
Charge Current Limit (CCL) – this is the maximum current that the battery will accept at any
2.
given time stated in Amps. This is a secondary control feature behind the more effective
maximum charge voltage control method. This value reduces as the battery approaches 100%
State of Charge (SoC). The Venus controller uses this value to ensure that the combined Victron
system of inverter/chargers and MPPT’s does not exceed the CCL of the Lite. If the CCL drops to
zero, the Victron system within a few seconds will ensure that there is no net current flow into
the Lite.
Discharge Current Limit (DCL) – this is the maximum discharge current that the battery is
3.
prepared to accept at any given time. This value typically decreases as the battery drops below
10% SoC. The Victron inverter cannot enforce a variable DCL unless in ESS mode were an AC
input source can be used to supplement the power to the loads. If there is no AC input source
the inverter will stop supplying power to the loads as soon as the DCL drops to zero.
Battery Temperature
4.
Minimum Battery Voltage
5.
Battery State of Charge
6.
Battery State of Health
7.
Battery Voltage
8.
Battery Current
9.
Battery Name
10.
All of the above information can be viewed in the Freedom Lite device sub menus on the Venus
device. Specific setup of the Venus device and the Multi/Quattro is required to ensure the required
control is implemented.
If the CAN bus cable is removed or damaged the Victron inverters will shut down within 5 minutes.
