Rapid Rail Joiner Bars KJS2-MM

A rail joiner connects the ends of two solar racking rails. It keeps the sections aligned and allows multiple rail lengths to form a longer continuous run.

Use one KJS2-MM joiner at each Rapid 1 rail joint. Remember that a typical portrait panel row uses two parallel rails, so joining both rails at the same point normally requires two joiners.

Insert the joiner assembly into the side channel at the ends of the two rails. Centre it across the joint, align the rail sections and tighten both fasteners to 12 ft-lb (16.3 N-m).

Yes. The KJS2-MM supports the bonding path between compatible mill-finish Kinetic rails when it is installed according to the K-Rack instructions.

The complete racking system must still include the required bonding clamps, grounding lug and equipment-grounding conductor.

Yes. A long aluminum rail can be cut into shorter sections for easier transportation and then reconnected at the installation site using KJS2-MM rail joiners.

Use suitable aluminum-cutting equipment, make clean square cuts and remove sharp edges and metal debris before assembly.

If you are cutting a long rail for easier transportation, first work out where the rail and roof-mounting brackets will sit on the finished array. Choose a cut location that will place the joined section close to one of those roof attachments.

Avoid placing the joint in the middle of the largest unsupported space between roof attachments. You should also avoid positioning it directly underneath a panel mid clamp or end clamp, since you will need access to the rail channel and joiner bolts.

Make a clean, square cut, remove any sharp edges and bring the two rail ends tightly together. Centre the joiner across the joint so approximately half of the joiner sits inside each rail section, then tighten both bolts to 12 ft-lb (16.3 N-m).

For a simple rooftop installation, the general rule is: keep the joint close to a roof attachment, make sure both rail sections are properly supported and leave enough room to install and tighten the joiner.

The KJS2-MM is designed for compatible Kinetic Solar rails. It should not be assumed to fit or provide an approved structural or bonding connection with another manufacturer's rail profile.

No. A thermal break is intentionally left between rail sections to accommodate expansion. Kinetic requires the bonding path across a thermal break to be completed using ground lugs and an appropriately sized bonding conductor rather than a rigid rail joiner.

Kinetic Solar backs its K-Rack products with a 20-year limited manufacturer warranty against defects in materials and workmanship. Warranty coverage requires installation in accordance with Kinetic Solar's written instructions and engineering specifications.

Contact us with your rail lengths, panel layout and roof-attachment spacing. We can help identify the appropriate components and review the proposed rail arrangement.