1. Are You a Manufacturer or a Trading Company?

Question:
“Are you a manufacturer? Which products do you produce in your own factory?”

Answer:
Do not stop at a simple “Yes”.

Ask which products are manufactured in-house, where the factory is located, and whether you can visit the production facility.

This is particularly important when you are sourcing customized or project-based products such as PV cable harnesses, solar junction boxes and DC combiner boxes.

A supplier that understands its own manufacturing process should be able to explain:

Materials → Production → Testing → Quality Control → Delivery

This can help you distinguish a real solar manufacturer from a company that mainly acts as a trading intermediary.

2. What Certifications Does This Exact Product Have?

Question:
“Which certifications does this product have?”

Answer:
Instead of only asking whether a company has certificates, ask whether the certification applies to the exact product and model you are buying.

For PV electrical components, buyers may need to consider standards and certifications such as:

• IEC
• TÜV
• CE
• UL
• ETL
• SAA

The important point is not simply having a certificate.

You should check:

Product → Model → Specification → Certification

For example, if you are sourcing a solar PV connector, DC fuse connector, PV cable or solar junction box, make sure the documentation corresponds to the actual product you intend to purchase.

3. Can You Provide Samples Before Mass Production?

Question:
“Can we test samples before placing a bulk order?”

Answer:
A reliable supplier should be willing to provide samples for evaluation, especially for electrical products and customized solutions.

Samples allow you to check:

• Material quality
• Assembly quality
• Dimensions
• Connector compatibility
• Cable and terminal crimping
• Product workmanship
• Packaging and labeling

For customized products, a good purchasing process is usually:

Requirement → Engineering Review → Sample → Testing → Approval → Mass Production

This is much safer than choosing a supplier based only on a quotation.

4. Can Your Engineering Team Understand My Project?

Question:
“If I give you our BOM, drawing or project requirements, can your engineering team review them?”

Answer:
This is one of the most useful questions to ask at a PV exhibition.

A professional PV supplier should not only tell you the price.

They should also ask questions about your application.

For example, when discussing a DC combiner box, a supplier may need to understand:

• Number of PV strings
• System voltage
• Input current
• Fuse requirements
• DC SPD requirements
• Isolator requirements
• Enclosure protection
• Cable entry configuration
• Monitoring requirements

The quality of the supplier's questions can tell you a lot about its technical capability.

A good supplier does not simply sell you a product. They help you make sure the product is suitable for your application.

5. Can You Customize the Product?

Question:
“Can you customize the product according to our project requirements?”

Answer:
Not every PV project uses exactly the same configuration.

Depending on the application, you may need customized:

• PV cable harnesses
• Solar junction boxes
• DC combiner boxes
• Fuse connectors
• Cable lengths
• Connector configurations
• Labels
• Packaging

If you are an EPC contractor or project developer, customization capability can be much more valuable than simply finding the lowest-priced standard product.

When visiting a solar supplier in China, ask:

“What kind of customized PV products have you produced before?”

Then ask them to explain how they handled the project.

6. How Do You Control Product Quality?

Question:
“What tests do you perform before the products are shipped?”

Answer:
Avoid asking only:

“Is your quality good?”

Almost every supplier will say yes.

Instead, ask about their actual quality control process.

For PV electrical components, you can ask about:

• Incoming material inspection
• Electrical testing
• Assembly inspection
• Finished product testing
• Sample approval
• Production inspection
• Final inspection

For products such as solar connectors, PV cable assemblies, junction boxes and combiner boxes, consistent manufacturing quality is especially important because these components are part of the electrical connection and protection system of a PV installation.

7. Can You Support Us After the Order?

Question:
“What happens if we have a technical or quality issue after delivery?”

Answer:
This question is often overlooked when comparing suppliers.

A reliable solar supplier should have a clear process for:

Technical Support → Problem Investigation → Corrective Action → Replacement or Solution

This is particularly important for overseas buyers.

A supplier may offer an attractive price, but if communication becomes difficult when a problem occurs, the actual cost of cooperation can become much higher.

What Should You Look for at a Solar Exhibition?

When visiting the Solar PV & Energy Storage World Expo 2026, don't collect as many brochures and business cards as possible.

Instead, try to identify suppliers that meet three basic requirements:

1. Manufacturing Capability
Can they actually manufacture the products you need?

2. Technical Capability
Can they understand your specifications and provide suitable solutions?

3. Long-Term Supply Capability
Can they maintain consistent quality, documentation and delivery when your purchasing volume increases?

If a supplier can perform well in all three areas, it may be worth moving to the next step:

Sample → Testing → Trial Order → Long-Term Cooperation

Meet NSPV at Solar PV & Energy Storage World Expo 2026

NewSun PV Technology Co., Ltd. (NSPV) will participate in the 18th Solar PV & Energy Storage World Expo 2026 in Guangzhou.

Date: September 16–18, 2026
Venue: Guangzhou · China Import and Export Fair Complex, Area B
Booth: B225-10.2

NSPV focuses on PV electrical components and DC-side solar solutions, including:

• Solar PV Connectors
• DC Fuse Connectors
• PV Cable
• PV Cable Harnesses
• Solar Junction Boxes
• DC Combiner Boxes
• Solar Fuse Holders
• DC Isolator Switches
• DC SPDs
• Other PV electrical components

If you are looking for a solar manufacturer, PV components supplier, solar connector manufacturer, solar junction box supplier or DC combiner box manufacturer, we welcome you to visit our booth.

Bring your BOM, drawings or project requirements.

Let's discuss your application and see how we can support your next PV project.

Welcome to visit NSPV at Booth B225-10.2.