Most procurement delays on solar projects trace back to the bill of materials. A BOM that is vague on specification, silent on quantities or inconsistent with the drawings will generate supplier queries, mismatched quotations and site-level substitutions.
1. Start from the single-line diagram
Every line in the BOM should be traceable to the SLD and layout: module count from the string design, inverter rating from the DC/AC ratio, cable sizes from voltage-drop calculations, and protection devices from the fault levels.
2. Specify, don’t just name
“DC cable 4 sq mm” is not a specification. Include conductor material, insulation type, voltage rating and applicable standard. The same applies to MMS (material, coating thickness, wind-load basis) and earthing (electrode type, length, compound).
3. Allow approved alternates
List two or three acceptable makes for each major item. It keeps commercial competition alive and protects the schedule when a preferred brand is out of stock.
4. Add the small items
Connectors, lugs, glands, ties, labels and signage are cheap — until they are missing on site. A standardised BOM template prevents these gaps.
5. Plan inspection and packing
For multi-vendor or export supply, define pre-dispatch checks and project-wise packing in the BOM itself, so consolidation happens once and correctly.
SOLCLIMB’s engineering desk reviews and optimises BOMs for EPC partners. Upload your BOM for a review and quotation.
