Fronius Primo 208-240 3.8-1 Installation Instruction page 25

Connection Diagram & Connection Area
Ungrounded solar modules
PV frame ground
Cu / Al Cu
max. Class 4
Cu: min. AWG 14 - max. AWG 6
Al : AWG 6
DC = (+)
DC = (-)
N
L1
L2
DC = Disconnect
Fronius Primo 208-240
DC = terminal block
MPPT1
MPPT2
DC = disconnect
Grounding terminal
Grounding electrode terminal *
Energy-
meter
AC ~ distribution
panel
Main grounding system
MPPT1 MPPT2
DC = (+) DC = (-)
L2
L1
N
Lockable AC ~
disconnect
switch (optional)
Sense
AC ~
25