PV Mounting Procurement: 8 Checks Before You Release the PO
A mounting purchase order can look complete while the design, bill of materials and installation documents describe slightly different systems. That gap often surfaces after delivery, when crews find a missing interface part, an unapproved substitution or a detail that was never assigned to anyone. Before releasing a PV mounting order, use a short submittal review to make sure every document refers to the same project and revision.
Why review belongs before the purchase order
The U.S. Department of Energy’s Federal Energy Management Program (FEMP) treats technical specifications as requirements that should carry through procurement, design drawings, submittal review, equipment delivery and commissioning. That is a useful model for EPCs and distributors: an approval at one stage should not silently disappear at the next. FEMP’s procurement guidance also provides a starting point for project-specific specifications.
Eight checks before you release the order
1. Confirm the controlling drawing set
Record the drawing title, revision, date and approval status on the order package. Check that the layout, mounting zones, roof or foundation interfaces and module arrangement match the currently approved set. If a drawing is still preliminary, label it clearly and identify who must approve the final issue. Do not let an old attachment in an email become the de facto construction document.
2. Write down the exact scope boundary
State which party supplies each interface item: roof attachments, rails, splices, clamps, fasteners, grounding or bonding parts, flashing, and any transition pieces. Identify items supplied by the roofing contractor, electrical contractor or module vendor. If engineering, stamped drawings, field verification or local permitting are outside the supplier’s scope, say so in the order documents rather than leaving the gap implicit.
3. Reconcile the bill of materials to the layout
Request a bill of materials (BOM) with manufacturer or supplier part number, description, finish where applicable, quantity and the drawing or assembly it supports. Compare it against the approved layout and details. Make the treatment of spares, cut lengths, project-specific kits and packaging units explicit. A quote total alone is not a useful receiving checklist when several similar clamps or fasteners are involved.
4. Verify module and attachment compatibility
Match the module model and frame dimensions to the mounting system’s approved interface. Confirm clamp type and position against both the module instructions and the racking instructions; do not assume that similar-looking modules have identical clamp zones. Likewise, verify that the roof or foundation attachment named in the drawings is the one included in the BOM. Ask for a written compatibility reference when the combination is not obvious from the submittal.
5. Make design criteria and responsibilities visible
List the project-specific criteria the supplier is expected to use, the design deliverables due with the submittal, and the party responsible for review and approval. Include the required design calculations or supporting evidence, if any, and identify assumptions that remain open. The goal is not to copy a generic product brochure into a purchase order; it is to make the design basis and the acceptance path traceable to the project documents.
6. Ask for the right compliance evidence
State which codes, standards, listings or approvals apply to this project and market, then request the evidence needed to verify them. As one U.S. federal example, DOE’s solar procurement template references UL 2703 for racking systems and clamping devices and calls for non-listed products to be identified in the submittal and approved before construction. That example is not a universal rule: use the requirements adopted by the local authority and the project contract. DOE’s model specification is useful as a document-planning reference.
7. Specify materials, finishes and approved substitutions
Identify the specified material and finish for each critical component, along with any project-specific environmental or compatibility requirements. Ask the supplier to flag a proposed substitution before shipment and provide the comparison documents for review. “Equivalent” should mean equivalent for the stated application and requirements, with written approval recorded—not simply similar dimensions or appearance.
8. Include installation and receiving documents
Request the installation manual for the exact system and revision, plus any inspection or commissioning records required by the contract. Make clear that crews must use the instructions for the selected parts: torque values and assembly steps can differ by component and product family. For example, IronRidge’s tilt-mount manual lists separate torque values for different connections and directs users to a third-party attachment manufacturer’s instructions where applicable. Include a packing list and delivery sequence that let the site team check packages against the BOM before installation begins. See the manufacturer manual.
A practical purchase-order hold point
Keep a simple submittal register with one row per required document: document name, revision, responsible party, review status and date. Release the order when the controlling drawings, scope, BOM, compatibility evidence and applicable compliance documents agree—or when each outstanding item has an explicit owner and an approved path to closure. FEMP’s lifecycle guidance connects procurement documents to later submittal review, equipment delivery and commissioning; keeping that chain visible makes it easier to catch a mismatch before it reaches the roof.
Before release: approved revision in hand; scope boundaries assigned; BOM reconciled; interfaces checked; design and compliance evidence identified; substitutions controlled; installation and receiving documents listed.
Spending a few minutes reconciling these documents gives procurement, engineering and the installation crew one shared definition of what is being supplied and what still needs approval.