Fronius Primo 208-240 Operating Instructions Manual page 21

Connecting 2–4 strings in Multi MPP Tracker mode:
PV 1
PV 2
DC-2 DC+2
DC-1 DC+1
Connecting two solar module fields to a Multi MPP
Tracker inverter
Single MPP Tracker mode on a Multi MPP Tracker inverter:
PV 1
PV 2
DC-1 DC+1
*
D1
=
Connecting multiple combined solar module fields to a
line on a Multi MPP Tracker inverter
Single MPP Tracker mode with just one string on a Multi MPP Tracker inverter:
Connect the strings separately to the two
MPP Tracker inputs (DC+1/DC+2). The
DC- terminals can be used as desired, sin-
ce they are connected internally.
Set MPP TRACKER 2 to "ON" when star-
ting for the first time (also possible in the ba-
sic menu subsequently).
max. 18 A
per MPPT
DC-
DC+1 DC+2
1 2 3 4
1 1 2 2
If the strings are connected with a string
collection box and only one collective line is
used for connection to the inverter, connec-
tion DC+1 (pin 2) and DC+2 (pin 1) must be
max. 36 A to
bridged.
a single
The cable cross-section of the DC connec-
DC terminal
ting line and bridging wire must be the sa-
DC-
DC+1 DC+2 me. Bridging the DC- terminal is not
1 2 3 4
1 1 2 2
necessary because it is bridged internally.
*
Set MPP TRACKER 2 to "OFF" when star-
ting for the first time (also possible in the ba-
sic menu subsequently).
D1
If the Multi MPP Tracker inverter is opera-
ted in Single MPP Tracker mode, the cur-
rents of the connected DC lines are
distributed evenly across both inputs.
21