Installing the Inverter
SolarEdge Installation Guide for Three Phase Inverters
– EU – Version 1.5
36
Residual Current Device
IMPORTANT SAFETY FEATURE:
All SolarEdge inverters incorporate a certified internal Residual Current Device
(RCD) in order to protect against possible electrocution and fire hazard in case of a
malfunction in the PV array, cables or inverter.
An external
RCD is required
in some countries. In these cases, the
installer must check which type of RCD is required by the relevant electric
code.
SolarEdge recommends using a type-A RCD. The recommended
RCD value is 100mA or 300mA unless a lower value is required by the
specific local electric codes
.
In installations where the local electric code requires the use of a lower
leakage RCD, the discharge current may trip the RCD. The following steps
can be taken in order to avoid this problem:
1
It is important to select an appropriate RCD in order to ensure proper
operation of the installation. Although the RCD used in such cases is a
30mA RCD, it may still trip at 15mA (according to IEC 61008). Good
quality RCDs will trip at a higher value.
2
Configure the trip voltage of the inverters’ internal RCD to a lower
current than the trip current of the external RCD. The internal RCD
may still trip if the current is higher than the allowed current, but
because the internal inverter RCD automatically resets when the
residual currents are low it does not require a manual reset. You may
consult with the SolarEdge support center for assistance with this issue.
3
Certain PV panels (with low capacitance leakage to the frame) are
preferable.
