Operation basics and hardware description 29
Features
Operation and protection features
Feature Description/Operation
Automatic operation The inverter wakes up and goes to sleep automatically depending
on the solar radiation conditions. It connects and disconnects to
the electrical grid automatically according to country
requirements. The inverter studies the system operations; it
generates messages and production data information to the user.
DC string fuses,
monitored
String fuses provide protection for solar modules and string
cabling against earth faults originating from solar side installation
errors or faulty components.
DC surge protection
device, monitored
A surge protection device (SPD) protects the inverter from
induced voltage spikes, for example caused by thunderstorms
close to the installation location. The inverter monitors SPD
cartridges and informs the user when the cartridge must be
replaced.
DC switch The manually-operated DC power switch which can disconnect
the inverter from solar modules under full load conditions. When
turned on, the DC switch interlocks the inverter’s bottom cover
and front cover so that they cannot be removed.
DC reverse polarity,
monitored
The inverter has a short circuit diode between the DC terminals to
protect the internal electronics from reverse voltages. In case of
reversed –dc and +dc connection the full short circuit current will
flow through the diode, setting the DC voltage to zero. The
inverter informs the user about reversed DC connection.
DC ground fault
monitoring
In accordance with VDE0126-1-1; the inverter monitors the
impedance between ground and DC terminals before grid
connection can be established.
MPPT Maximum power point tracking. Inverter software function that
automatically operates the solar generator, array, string or module
at its maximum power point. PVS300-TL inverters have one
MPPT.
Residual current detection In accordance with VDE0126-1-1; the inverter has a DC and AC
sensitive residual current monitoring unit (RCMU) which
measures and sums the currents of L and N conductors. If
residual currents (DC or AC) are detected, the inverter
disconnects from the grid.
AC Grid monitoring with
anti-islanding
In accordance with VDE0126-1-1; the inverter monitors the
voltage and frequency of the electrical grid and can detect if the
grid is operating with tolerances. The inverter also stops power
conversion and disconnects from grid when missing electrical grid
is detected (anti-islanding).
AC Over current trip,
monitored
The inverter hardware has an over current trip function. The
inverter informs the user if over current trip is performed.
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