21
Figure 3-10 Knockouts for conduits
7. Install ¾ in. conduit fittings for outdoor use in the knockout openings on the
bottom of the Wiring Box of Inverter. Use outdoor fittings to prevent water
getting inside Inverter and conduit. All cables from PV string should be routed
inside metal conduit.
8. Install ¾ in. metal conduit between the Inverter and PV strings or the combiner
box.
9. Pull cables from the PV side through conduit. Use only Class 2 or Class 3
cables. Solid wire is not recommended for use with ring lugs and screw
terminals in the Inverter. Put ring lugs at the end of cables before connecting
them to terminal block on the inverter side.
10. From each PV string, connect the Positive DC cable to terminal label (+) and
Negative DC cable to terminal labeled (-). There are provisions for 4 PV strings
(two strings for each MPPT) to be connected to Inverter (refer to Figure 3-11).
