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4.7.5 External fault interrupter (RCD)
The inverters in the SolarMax S series have an integrated AC/DC sensitive fault current
sensor. This sensor is able to distinguish between the operational capacitive stray cur-
rents (caused by capacities of the PV modules to the earth) and leakage currents (caused
by touching a pole of the PV generator). The inverter disconnects immediately from the
mains as soon as an overstepping of the absolute limit value (300 mA, important in rela-
tion to re safety) or a sudden increase in the DC-end fault current (30 mA, important to
protect against personal injury) has been detected.
NOTE
When selecting an additional external earth leakage circuit breaker (ELCB), you must
remember that during operation the leakage currents can be as high as several 10mA
per inverter. That is why the rated differential current of an external RCD must be at
least 100 mA, for very large PV plants with several S series inverters it may also be
necessary to use a 300 mA-RCD. Since the inverters in the S series are designed not to
cause direct current fault currents on the AC end, an external type A RCD can be used.
4.7.6 Connecting the inverters to the mains
DANGER
Make sure that all the DC and AC feed lines to the inverter are dead before you start
the installation work.
Connecting conditions
■ Each inverter must be protected separately! No consumers may be connected be-
tween the fuse and the inverter!
■ The following table contains recommended mains fuses and minimum line cross-sec-
tions necessary for the AC feed line:
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