In solar procurement, an RFQ (Request for Quotation) asks suppliers to price a specification you have already defined, use it when you know exactly what you need and want to compare on price and terms. An RFP (Request for Proposal) asks suppliers to propose how they would meet a requirement, use it when the solution is not yet fixed and you want expertise and approach, not just price. For most solar material sourcing, where the specification is known, the RFQ is the right tool: it produces comparable, like-for-like quotes. The RFP fits earlier-stage or design-build decisions where the how still needs defining.
”- RFQ = 'price this exact specification', use it when you know what you need.
- RFP = 'propose how you would solve this', use it when the solution is still open.
- For solar material sourcing with a known spec, the RFQ produces comparable, like-for-like quotes.
- The RFP fits design-build or early-stage decisions where approach and expertise matter, not just price.
- Using the wrong one wastes time: an RFP for a known spec is slow, an RFQ for an undefined need gives noise.
The core difference
The distinction is simple but consequential. An RFQ and an RFP ask suppliers for fundamentally different things:
- An RFQ (Request for Quotation) says: "here is exactly what I need, tell me your price and terms." It assumes the specification is settled.
- An RFP (Request for Proposal) says: "here is my requirement or problem, propose how you would meet it." It invites the supplier's approach, not just a number.
The choice flows entirely from one question: do you already know precisely what you need? If yes, RFQ. If the how is still open, RFP.
When to use an RFQ
The RFQ is the workhorse of solar material sourcing, because in most cases the specification is known. You know the wattage class, the cell technology, the certification requirement, the volume. What you want is the best price and terms for that exact thing, from competing suppliers.
Use an RFQ when:
- Your specification is fully defined, see the BOM sourcing checklist for locking it down.
- You want to compare suppliers on price, lead time and terms.
- You are buying standard components (modules, inverters, cabling) to a known spec.
A well-written RFQ produces the thing that saves you money: comparable, like-for-like quotes. This is exactly what posting an RFQ on VyaparCred does, one specification, many verified suppliers, quotes you can lay side by side.
When to use an RFP
The RFP fits earlier or more open decisions, where you know the outcome you want but not the exact solution. In solar, that is typically design-build, EPC selection, or complex projects where the supplier's approach, engineering and track record matter as much as price.
Use an RFP when:
- The technical solution is not yet fixed and you want suppliers to propose it.
- You are selecting a partner for approach and capability, not just pricing a component.
- Evaluation criteria go beyond price, engineering quality, timeline, references.
An RFP takes longer and is harder to compare, because each proposal differs. That is the trade-off: you gain expertise and options, you lose the clean like-for-like comparison an RFQ gives.
RFQ vs RFP side by side
| RFQ | RFP | |
|---|---|---|
| Asks for | A price on a defined spec | A proposed solution to a requirement |
| Use when | You know exactly what you need | The solution is still open |
| Best for | Standard components, material sourcing | Design-build, partner selection |
| Comparison | Easy, like-for-like | Harder, each proposal differs |
| Speed | Fast (24-48h quotes) | Slower, proposals take time |
| Decision basis | Price and terms | Approach, capability and price |
For most buyers sourcing solar materials to a known specification, the RFQ is the right default. The RFQ to cleared customs workflow shows how it runs end to end.
Getting the RFQ right
Since the RFQ is what most solar sourcing needs, getting it right is where the value is. A strong RFQ:
- Specifies exactly, wattage, technology, certification, tolerance, warranty, so every supplier quotes the same thing.
- States volume and phasing, so pricing reflects your real order.
- Requires certification as a hard condition (ALMM, IEC), so non-compliant quotes are filtered out early. See ALMM listing.
- Goes to multiple verified suppliers at once, so you get genuine price competition.
Do that and the quotes come back comparable and competitive. For how to run it across corridors, see how to source solar panels in bulk and what is a B2B solar marketplace.
Run one RFQ, get comparable quotes
VyaparCred is built for the RFQ: post one specification, reach multiple verified suppliers across corridors, and get back quotes you can compare like for like.
One specification goes to many verified suppliers at once.
Certification status shows on each quote, filtering out non-compliant options.
Quotes come back comparable on landed cost, so price competition is real.