Technical Description
11
Functionality of the Inverter
REFUsol 50K-3T
982081 | 03 | 2021-03
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monitoring and disconnection from the AC mains are
carried out by redundant AC relays.
The control and regulation board centrally moni
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tors, regulates and controls all unit functions. For this
purpose, all sensor data are recorded, processed and
the operating status of the inverter is displayed (LCD).
This includes the current operating data, error mes
-
sages and warnings (warning LED).
The communication board enables the connection
of different adapters (RS485, Ethernet, WiFi) and the
communication of the inverter with other IT devices
(PC, smartphone) and web portals.
Depending on the design of the PV system and the
wiring of the individual PV modules, the PV strings can
be connected to three MPP trackers and operated in
"parallel mode" or "independent mode".
Independent mode (default)
If different PV outputs are expected at the three
MPPT inputs due to shading or different orientation
(azimuth or tilt angle), independent mode should be
used for the purpose of PV yield optimisation.
Parallel mode
If all PV strings are connected in parallel via a "com
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biner box" or Y-cable, "Parallel mode" must be used.
Fig. 3: Examples for MPPT operating modes
1
Parallel mode
(open area with the same
orientation)
2
Independent mode
(roof surfaces with differ
-
ent orientation)
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2
