Studer Innotec SA
next3
44 V 1.3 © Studer-Innotec SA next3 Tech manual
constant voltage on PV+ and PV- compared to the ground referential. This avoids leakage current
through the parasitic capacity between cells and ground and therefore avoid problems with RCD
breakers (return current default).
The PV input of the next3 is non-isolated, which means the PV+ and PV- must be floating
(similarly to the majority of Transformer Less, TL, solar inverters). The PV must not be
grounded. Accidental grounding will be detected and cause a stop of the next3 inverter.
The frame of the PV modules should be grounded.
As the Open Circuit voltage (Voc) of the panel is above 60Vdc (in all the
temperature range), the whole solar system must be installed according to
protection class II. Use proper connectors and cables for all the solar system, as
requested by local regulation.
5.4.4
Cables and cross-section
The next3 is build from factory with Phoenix Sunclix connectors for the PV inputs of the MPPTs. There
are4 pairs of Sunclix connectors provided with the unit to assemble on your PV wires arriving to the
unit. These connectors can be assembled without special tool. A flat screwdriver is necessary to
decouple the connected once enclicked.
(image from phoenix contact, supplier of Sunclix connectors)
The minimal section for cables in Sunclix connectors is 2.5mm
2
. Sunclix connectors are rated:
2.5mm
2
: 27Adc / 4mm
2
: 40Adc / 6mm
2
:40Adc. We advise you use a 4 or 6mm
2
cross section to
Never ground PV+ or PV-. Ground the PV modules frames
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