Save time and money on your next ground mount solar install with Tamarack’s low-cost, rail-based Ground Mount Kits. Built with heavy-duty 3.1 mill-finish aluminum rails, these kits deliver a strong, clean install with best-in-class wire management—while keeping shipping simple (UPS-shippable) and costs transparent. Key Features & Benefits: Heavy-duty 3.1 mill-finish aluminum rails for long-lasting outdoor performance Rated up to 170 MPH wind and 70 psf snow load (site conditions apply) UL 2703 Listed components with Class A Fire Rating for Type 1 & 2 modules Best wire management: PV cables + module-level electronics wiring fit inside rails DIY-friendly, rail-based design for faster installs and clean cable routing Expandable array: combine kits for arrays up to 100 ft long UPS-shippable for easier delivery and economical shipping PE Certified: pre-stamped engineering letters available for most states Module Compatibility / Fit: Fits module frame thickness 30mm–40mm Deeper frames supported with 50/50+ mounting clamps (Item 89907, sold separately) Max module width: 46.16" (3-module kits) / 45" (4-module kits) Choose your configuration by Modules per Column and Post Count: 3 Modules per Column (140") 91450-A – GM Kit A (for 4 posts): (4) 70" rails, (4) 2" pipe caps, (2) splices, (4) pipe mounts, (8) 50/50 clamps, (4) end caps, (8) module lead clips, (1) ground lug 91467-A – GM Kit B (for 2 posts): (4) 70" rails, (2) 2" pipe caps, (2) splices, (4) pipe mounts, (8) 50/50 clamps, (4) end caps, (8) module lead clips, (1) ground lug 91474-A – GM Kit C (for 0 posts): (4) 70" rails, (2) splices, (4) pipe mounts, (8) 50/50 clamps, (4) end caps, (8) module lead clips, (1) ground lug 4 Modules per Column (186") 90798-A – GM Kit A (for 4 posts): (4) 93" rails, (4) 2" pipe caps, (2) splices, (4) pipe mounts, (10) 50/50 clamps, (4) end caps, (8) module lead clips, (1) ground lug 90804-A – GM Kit B (for 2 posts): (4) 93" rails, (2) 2" pipe caps, (2) splices, (4) pipe mounts, (10) 50/50 clamps, (4) end caps, (8) module lead clips, (1) ground lug 90835-A – GM Kit C (for 0 posts): (4) 93" rails, (2) splices, (4) pipe mounts, (10) 50/50 clamps, (4) end caps, (8) module lead clips, (1) ground lug Add-On Variant: 3.1 Rail Extension Kit (9" Rails with Splices) Need a little extra rail length for Tamarack mounts? Choose the 3.1 Rail Extension Kit (9" Rails with Splices)—a 9-inch rail extension designed for TTP-A and Ground Mount systems. Max Module Width (with this Extension Kit): TTP-A-3 & TTP-A-6 Mounts: up to 46" module width 3-Module Ground Mounts: up to 46" module width 4-Module Ground Mounts: up to 47.5" module width Installation Notes (Rail Splice Assembly): Rail splice arrives partially assembled with one end inserted 5" into the 9" rail, secured by (1) bolt + channel nut Slide the second rail section over the splice until it contacts the first rail section, then install the second bolt + channel nut Tighten both bolts to 144 in-lbs (12 ft-lbs) If a locking bolt interferes with mid-clamp placement, it can be loosened and moved slightly during module installation What’s Not Included (Required Separately): Concrete and/or Ground Screws 2" Schedule-40 Pipe Swivel Tees for cross-bracing (if needed) Cross-Bracing (When Required): Some site conditions require cross-bracing. Use: 90699 – Swivel Tee (2" tee fitting): use (1) per vertical post when bracing is requiredSites with ground slope greater than 15° may require additional engineering certification. User Manual / Documents: Tamarack Ground Mount Kit Installation Manual Tamarack Ground Mount Kit Data Sheet Tamarack 3.1 RAIL EXTENSION KIT Data Sheet
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