This section is only relevant if you have a delta grid topology, which is only found in some
parts of Belgium, Norway and France. If this is not applicable, you can skip this section.
When an EV Wall is installed in a residential installation with a 3P (3 x 230 V) Delta grid connection,
some additional requirements need to be taken into account. You can verify whether you have this
topology by checking the grid connection to see if the following are true:
• There is no neutral wire.
• The voltage between two phases is approximately 230 V.
• The voltage between a phase and earth is approximately 130 V.
Some EVs are not compatible with this type of grid connection due to a built-in security in the EV.
Contact your EV manufacturer for more information.
The security feature that some EVs have is a voltage check between the phase that is connected as
neutral and the ground. If this is not 0 volts, the car won’t charge. The presence of this security
feature may vary for each manufacturer and for each model.
As there is no neutral wire available in this topology, the L3 will be used as neutral. In this case, some
EVs will be able to charge dual phase (using both L1 and L2) and some will only charge single phase.
In practice, this may limit the maximum charging power. This again varies for each EV manufacturer
and each model.
If your EV is not compatible with this grid topology, or if you would like to achieve higher charging
power than what is possible on a delta grid topology, you can install a transformer. This transformer
will convert the 3 x 230 V delta topology to a standard 3 x 400 V star topology.
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