Under Part 2, the cover plate must be made from tempered or toughened glass with a minimum solar transmittance of 82%, while the collector box can be constructed from materials such as aluminum alloy, fiberglass, CRCA steel sheets, galvanized steel sheets, or HRC steel sheets, fabricated using techniques like inert arc welding, gas brazing, or spot welding. The absorber — including risers, headers, and absorber sheets — can be made from materials such as copper, aluminum, stainless steel, or mild steel. The standard also emphasizes corrosion resistance and weatherproof construction, defines performance requirements including thermal efficiency and heat loss parameters, and mandates long-term durability testing to ensure reliability.

Tests

Mandatory Tests:

1. Solar Transmittance Test (Cover Plate)

2. Thermal Efficiency Test

3. Heat Loss Parameter Test

4. Weatherproofing/Corrosion Resistance Test

5. Long-Term Durability Test

6. Material Composition Verification (Absorber, Collector Box)

Optional Tests:

1. Weld Quality Inspection

2. Dimensional Accuracy Check

Benefits of Obtaining ISI Mark for Solar Flat Plate Collector for Solar Water Heating Systems

Here are the key benefits of getting ISI Mark certification:

• Government Quality Assurance: Getting the ISI mark for IS 12933 helps with safer structural applications, business growth, and customer satisfaction.

• Mandatory Compliance: Products covered under this order must conform to the relevant Indian Standard, bear the BIS Standard Mark, and manufacturers must obtain a BIS license to use the ISI Mark on their products.

• Enhanced Market Competitiveness: The product comes under Scheme 1 certification, which helps manufacturers grow their businesses by assuring customers of good product quality and compliance with national standards.

• Regulatory Oversight: The Bureau of Indian Standards, in consultation with the Ministry of New and Renewable Energy, conducts market surveillance to ensure compliance with the Indian Standard for goods bearing the Standard Mark.

• Export Flexibility: This rule does not apply to products meant solely for export, and goods or articles meant for sub-assemblies of exported items are also exempt.

Frequently asked questions (FAQ)

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