2020-12-11 00:44
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Hub-4 / grid parallel - manual DEPRECATED
Victron Energy - https://www.victronenergy.com/live/
Power regulation details - phase compensation setting
In a three-phase Hub-4 system, there is at least one Multi installed on each phase. We recommend
leaving phase-compensation setting to its default: enabled. The system will regulate the total power
of the three phases to zero. When phase-compensation is disabled, each separate phase is regulated
to 0.
With phase-compensation enabled, all the inverter/chargers will either be charging or discharging: the
system prevents to charge the battery on one phase, and discharge it on the other phase.
When the system as a whole produces power (PV power exceeds consumption), the Multis on the
phases with a net power production will be set to charge the battery. Multis on phases with a net
power usage, Ppv < Pload, will be on idle.
When the system as a whole consumes power (Consumption exceeds PV production), the Multis on
the phases with a net power usage will discharge the battery to compensate for the shortage. Multis
on phases with a net power production will be on idle.
Disabling phase compensation
In a hub-4 system it is still possible to balance the grid power of each phase to 0W. Disable phase
compensation. This would however cause significant losses, because power will flow from one phase
to another through the DC connections. Causing losses when converting from AC to DC on one phase
and then from DC to AC and the other phase.
Phase compensation, balancing the total grid power to 0 is therefore more efficient. It avoids the AC-
DC roundtrip losses.
Note on the maximum charge current
In a multi-phase system, the charge current is configured per phase. There is not a total charge
current which the system adheres too. This means that, for example when there is a relatively small
battery bank, and a huge over production of PV on L1, and not on the other phases, only part of that
over production on L1 will be used to charge the battery.
4. Connecting and configuring the AC sensor
A Hub-4 setup requires an AC sensor connected in the main distribution panel: between the grid and
installation. This AC sensor has been designed for 3 phase measurement, but can be configured for
single phase support as well.
3-phase setup diagram:
