SolarEdge SE66.6KUS Installation Manual page 19

Step 1: Mounting and Grounding the Power Optimizers
Figure 5: Power optimiser installation and grounding using a star washer
For mounting on rails with sliding nut fasteners: If the star washer cannot be used, use the
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SolarEdge grounding plate (purchased separately) between the railing and the flat side of the
mounting bracket. Use mounting specific hardware as needed. Apply torque of 9.5 N*m / 7 lb*ft.
See Figure 6
Figure 6: Power optimiser installation and grounding using a grounding plate
For mounting on un-grounded structures (such as a wooden structure): If the star washer or
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the plate cannot be used, use the SolarEdge grounding lug (purchased separately) with an
equipment-grounding conductor a ccording to the supplied instructions. The grounding terminal
accepts a wire size of 6-14 AWG, and must be sized for equipment grounding per NEC 250.122
requirements. Tighten the screws connecting the power optimiser to the frame and the
grounding terminal screw. Apply torque of 9.5 N*m / 7 lb*ft. See Figure 7
5. Verify that each power optimiser is securely attached to the module support structure.
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-Three Phase Inverter with Synergy Technology Installation MAN-01-00402-1.4
Figure 7: Power optimiser grounding terminal