13
EN
Notes regarding inverters with single and multiple
MPP trackers
Inverter with sin-
gle MPP tracker
Fronius Symo 3.0-3-S / 3.7-3-S / 4.5-3-S
Connecting one solar module field to an inverter with a
single MPP tracker
In the case of these inverters, there are 3
terminals available for each DC+ and DC-.
The terminals are internally connected and
are not fused. This means that a maximum
of 3 strings can be connected in parallel di-
rectly to the inverter.
In this case, the solar modules must be able
to carry at least the single reverse current
(for 2 strings) or twice the reverse current
(for 3 strings) (see data safety sheet for so-
lar module).
Where there are more than 3 strings, an ex-
ternal collection box with string fuses must
be used. In this case, the strings must con-
tain the same number of modules in each
case.
Inverter with mul-
tiple MPP track-
ers
Fronius Symo 8.2-3-M
Connecting two solar module fields to an inverter with
multiple MPP trackers
In the case of inverters with multiple MPP
trackers, there are 2 independent DC inputs
(MPP trackers) available. These can be
connected to an unequal number of solar
modules.
There are 2 terminals for DC+ available per
MPP tracker. In total there are 4 terminals
for DC-.
Connecting 2-4 strings in multiple MPP tra-
cker mode:
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 up for the first time, set MPP
TRACKER 2 to “ON” (this will also later be
possible from the Basic menu)
1
DC+
DC-1
DC+1
DC-
2
1 2 3
3
PV 1
Fronius Symo
3.0-3-S / 3.7-3-S / 4.5-3-S
1
DC+1
DC-1
PV 1
PV 1
PV 2
DC+1
DC-2
DC+2
DC+2
DC-
2
1 2 3 4
1 2
Fronius Symo 8.2-3-M
