Fronius Primo (Online) - Manual (Page 19)

17
EN
Inverter with mul-
tiple MPP track-
ers In the case of inverters with multiple MPP trackers, there are two independent DC inputs
(MPP trackers) available. These can be connected to an unequal number of solar modules.
There are two terminals for DC+ available per MPP tracker. In total there are four terminals
for DC-.
Connecting two to four strings in multiple MPP tracker mode:
Connecting two solar module fields to an inverter with
multiple MPP trackers
Divide the strings between the two MPP tra-
cker inputs (DC+1/DC+2). The DC- termi-
nals can be used however you wish, as
they are internally connected.
When starting for the first time, set MPP
TRACKER 2 to "ON" (this will also later be
possible from the Basic menu).
Single MPP tracker mode on an inverter with multiple MPP trackers:
Connecting multiple interconnected solar module
fields to an inverter with multiple MPP trackers using
one lead
If the strings are connected using a string
collection box and only one bus is used for
connection to the inverter, the connection
DC+1 (pin 2) and DC+2 (pin 1) must be
jumpered.
The cable cross-section of the DC connec-
tion lead and the jumpering must be the sa-
me. Jumpering of the DC terminal is not
necessary, as these terminals are jumpe-
red internally.
When starting for the first time, set MPP
TRACKER 2 to "OFF" (this will also later be
possible from the Basic menu).
If the inverter with multiple MPP trackers is
operated in single MPP tracker mode, the
currents from the DC leads connected are
divided evenly across both inputs.
DC-2
DC-
DC-1
max. 18 A
per MPPT
PV 1
PV 2
1 2
1 2
3 4
1 2
DC+1 DC+2
DC+1
DC+2
PV 1
PV 2
1
DC+1
DC-1
DC+2 DC-
1
1 2 3 4
2 2
D1 D1
=
*
*
DC+1
max. 36 A to
a single
DC terminal