Vendor Control — Where Great EPCs Win or Lose

Vendor Control — Where Great EPCs Win or Lose

If site discipline controls execution,
vendor control protects performance before material even reaches site.

A strong EPC doesn’t just buy equipment.
It controls quality, timelines, and accountability.

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💡 What Strong Vendor Control Looks Like

1️⃣ Technical Pre-Qualification

• Vendor technical evaluation before PO
• Past project performance review
• Financial stability check
• Manufacturing capability assessment

Not every Tier-1 label guarantees project success.

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2️⃣ Detailed Technical Specifications

• Clear datasheets & deviation approval process
• Approved vendor list (AVL) control
• Strict adherence to BOQ ratings
• No silent spec downgrades

Great EPCs lock specifications early.

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3️⃣ Factory Inspections & FAT

• Module EL testing validation
• Inverter FAT witnessing
• Transformer routine tests
• Protection relay configuration checks

Problems found in factory cost thousands.
Problems found after installation cost lakhs.

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4️⃣ Delivery & Documentation Control

• Test certificates verification
• Warranty documentation review
• Dispatch clearance process
• Material reconciliation at site

If documentation is weak, warranty claims become weak.

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⚡ Why Vendor Control Separates Great EPCs

An average EPC says:

“Material arrived, install it.”

A great EPC says:

“Prove it meets performance standards.”

Because in solar projects:
• 70%–75% of CAPEX is equipment
• Performance guarantees depend on equipment quality
• Warranty claims depend on documentation

Vendor control is not procurement pressure —
it is risk management for 25 years.

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👷‍♂️ From your experience in MW-scale projects,

What usually causes vendor issues?
• Price pressure?
• Timeline pressure?
• Poor technical evaluation?
• Weak contract clauses?

In long-term solar performance,
vendor discipline = financial discipline.

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