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Three-phase self-use system
The PowerRouter is a 1-phase inverter. It can be used to supply the energy to a single external conductor. Three
PowerRouters and three battery banks allow you to set up a 15kW system which optimises self-use on three
phases.
PowerRouter in the three-phase system
The PowerRouter Solar Battery can be deployed in a three-phase self-use network. A PowerRouter with its
own, independent photovoltaic strings and independently connected batteries can be connected between
each external conductor and the Neutral conductor (it is not possible to use a common battery bank for all
three PowerRouters). The PowerRouter synchronises to the frequency of the power on the external AC mains
conductor when feeding back to the utility grid. This ensures that the 120° phase shift between the three
phases of a 3-phase system is maintained. Figure 38 shows how the PowerRouters should be connected in a
three-phase network.
Figure 38: The PowerRouter in a three-phase self-use system
A system with three PowerRouters, each with its own battery bank, cannot be used for three-phase backup
power. The PowerRouter is not capable of delivering three phases itself, it can only match the three phases of
the grid power. Single-phase backup power is possible, however.
If 1-phase sensors are used, the maximum length of an extension cable for the sensor is 10 metres. If this is still
too short, 3-phase sensors can be used, which should be configured as 1-phase sensors. In the manual for the
3-phase sensor, this configuration is designated ‘1p’.
More than one PowerRouter on single-phase
If the system is suitable for this purpose, it is possible to connect more than one PowerRouter Solar Inverter
(PRxxS) on single-phase. This is different however, when you use a PowerRouter Solar Battery (PRxxSB-BS).
Because this system uses a sensor to measure consumption levels, the readings are subject to interference
from other transformers which have a parallel connection on the phase. This results in incorrect readings on
a number of graphs on myPowerRouter.com (e.g. consumption). However, its actual functioning will not be
disrupted; the self-use system provides more solar output for charging the battery.
Sensor
PowerRouter 1
AC Grid
N L
0 1 7 7 6 3
PowerRouter 2
N L
0 1 7 7 6 3
PowerRouter 3
N L
N L1 L2 L3
0 1 7 7 6 3
0 1 7 7 6 3
AC Grid
AC Grid
N
L1
L2
L3
