Installation Guide

4.2 Top Down Clamps

Clamps are an approved method of mounting for Renogy modules. A

clamp holds two modules in a row. The centerline of the clamps must be

in-line with the module mounting holes and installed according to code.

4.3 Grounding

The frame of the PV module, as well as any exposed non-current carrying

metal parts of fixed equipment that can be energized must be grounded to

avoid electrical shock. Renogy recommends grounding all PV module

frames to ensure the voltage between the conductive equipment and the

earth ground is zero in all circumstances.

Appropriate grounding consists of using an appropriately sized EGC or

racking system that can be used for integrated grounding. Renogy panels

implement a coated aluminum frame for corrosion resistance. The frame

rails have pre-drilled holes marked with the grounding sign. Do not drill

additional holes into the frame rails.

 Note that the stainless steel washer is used between the grounding

wire and the module frame. This is for avoiding corrosion due to

dissimilar metals.

 The module frame must be properly grounded (refer to NEC clause

250). The grounding wire must be properly fastened to the module

frame to assure good electrical contact. Use the recommended type,

or an equivalent, connector for this wire.

 If the support frame is made of metal, the surface of the frame must

be electroplated and have excellent conductivity.

 We recommend the lay-in lug (Cat. No. GBL4-DBT; rated for

600Volts; company: ILSCO; UL number is E34440）when

grounding. First strip 16mm insulating jacket from the end of the

ground wire (4-14 STR.) carefully to avoid nicking or cutting

conductors, insert the wire into the slot of the lug (see the picture),

and screw down the slotted screw.

 Next, assemble the recommended ILSCO grounding lug to the

aluminum frame using stainless steel M3 or M5 screw and hardware

as shown below. Note: there are two different size grounding holes,

the smaller of which is being phased out.

 Further, buildup of hardware for mounting the grounding lug are the

same—except for the M3 screw, an added flat washer is mounted

directly under the M3 screw head. The star washer is fitted directly

under the grounding lug and makes electrical contact by penetrating

the anodized coating of the aluminum frame, The screw assembly is

further fitted with a flat washer, then a split lock washer and finally a

nut to secure the entire assembly, as shown. Recommended torque

of M3 or M5 screw assembly is 0.8NM or 1.5 NM.

4.4 Module Dimensions

The modules will be mounted using the mounting holes (on the short

side of the aluminum frame), closest to the edges.