GB/T 29759-2026Insulating solar photovoltaic (PV) glass units for buildings (English PDF)

6.3 Dimensions and their tolerances

6.3.1 Permissible deviations in length and width The allowable deviations in length or width of flat products shall meet the requirements of Table

2.For curved products, the deviations shall be agreed upon by both the supplier and the buyer.

6.3.2 Thickness and its permissible deviations The allowable thickness deviation for flat products is ±2.5mm. The thickness deviation for curved products shall be agreed upon by the supplier and the buyer.

6.3.3 Difference between diagonals For rectangular flat products, the difference in diagonal length should not exceed 0.2% of the average diagonal length. For other shapes, the difference shall be agreed upon by the supplier and the buyer.

6.3.4 Permissible overlap The permissible overlap tolerance for flat products shall comply with the provisions of Table

3.The tolerance for bent products and products with special requirements shall be determined by the supplier and the buyer.

6.3.5 Width of Inner Sealant It should meet the requirements of

6.1.5 in GB/T 11944-2025.

6.3.6 Depth of outer sealant It should meet the requirements of

6.1.6 in GB/T 11944-2025.

6.3.7 Deviation in the position of the spacer bar It should meet the requirements of

6.1.7 in GB/T 11944-2025.

6.4 Light transmittance The light transmittance of solar photovoltaic insulating glass should be the product of the basic light transmittance and the ratio of the light-transmitting area, as agreed upon by both the supplier and the buyer. Require.

6.5 Maximum power After initial stabilization, the difference between the maximum power value and the initial value should be within ±3% of the initial value.

7.1 Appearance Quality

7.1.1 Sample The product was used as a sample.

7.1.2 Test Procedure The process shall be carried out according to method

7.2.2 of GB/T 11944-2025, wherein the solar photovoltaic laminated glass shall be manufactured according to GB/T 29551-2023. The method described in section

6.3 is followed.

7.2 Dimensions and their tolerances

7.2.1 Sample The product was used as a sample.

7.2.2 Test Procedure Perform according to the method in

7.1.2 of GB/T 11944-2025.

7.3 Light transmittance

7.3.1 Sample Prepare samples according to the requirements of Chapter 6 of GB/T 40415-2021, with a quantity of 3 samples per group.

7.3.2 Test Environment and Instrument Requirements It meets the requirements of Chapter 5 of GB/T 40415-2021.

7.3.3 Basic transmittance test method Perform the procedure according to Chapter 7 of GB/T 40415-2021.

7.3.4 Test method for the ratio of light-transmitting area Using a length measuring tool, measure the light-receiving area S of the solar photovoltaic insulating glass (excluding the outer and inner edge sealants). The area of the light-transmitting region (S1) and the area of the light-transmitting region (S2) are used to calculate the ratio of the light-transmitting region area (eta) according to formula (1).

7.4 Maximum Power

7.4.1 Sample The product was used as a sample.

7.4.2 Test Apparatus It meets the requirements of MQT02 in GB/T 9535.2.

7.4.3 Test Procedure Perform according to the MQT02 method in GB/T 9535.2.

7.5 Insulation

7.5.1 Sample The product was used as a sample, with a quantity of 3 pieces.

7.5.2 Test Apparatus It meets the requirements of MQT03 in GB/T 9535.2.

7.5.3 Test Conditions It meets the requirements of MQT03 in GB/T 9535.2.

7.5.4 Test Procedure Perform according to the method of MQT03 in GB/T 9535.2.

7.6 Leakage Current

7.6.1 Sample The product was used as a sample, with a quantity of 3 pieces.

7.6.2 Test Apparatus It meets the requirements of MQT15 in GB/T 9535.2.

7.6.3 Test Procedure Perform according to the method of MQT15 in GB/T 9535.2.

7.7 Resistance to ultraviolet (UV) radiation

7.7.1 Sample The sample is a flat specimen measuring 510mm × 360mm, cured for more than 7 days, made of the same material as the product and under the same process conditions. Two pieces of the product type. The sample of crystalline silicon solar photovoltaic insulated glass should contain at least one crystalline silicon cell; thin-film solar photovoltaic insulated glass... The glass sample should be identical to the product.

7.7.2 Test Equipment It meets the requirements of

7.4.2 in GB/T 11944-2025.

7.7.3 Test Procedure Perform according to the method in section

7.4.3 of GB/T 11944-2025.

7.8 Dew Point

7.8.1 Sample Five samples were used as test specimens.

7.8.2 Test Conditions The test was conducted in an environment of 20°C±5°C and relative humidity of 30%~75%. All samples were placed in this environment for at least [duration missing] before the test. 24 hours.

7.8.3 Test Equipment It meets the requirements of

7.3.3 in GB/T 11944-2025.

7.8.4 Test Procedure Perform according to the method in section

7.3.4 of GB/T 11944-2025.

7.9 Water vapor sealing durability

7.9.1 Sample The sample was made of the same material as the product, under the same process conditions, and was approximately 510mm × 360mm in size, cured for more than 7 days. The sample consists of 15 pieces (4 for initial moisture content determination, 2 for standard moisture content determination, and 5 for final moisture content determination). (4 samples for testing, spare). When a capillary tube is installed on the sample, the sample should be treated according to the usage and installation requirements. The sample of crystalline silicon solar photovoltaic insulated glass should contain at least one crystalline silicon cell; thin-film solar photovoltaic insulated glass... The glass sample should be identical to the product. Before the test, the sample should be placed in an environment of 20°C±5°C and relative humidity of 30%~75% for at least 24 hours.

7.9.2 Test Equipment It meets the requirements of

7.5.2 in GB/T 11944-2025.

7.9.3 Test Procedure Perform according to the method in section

7.5.3 of GB/T 11944-2025.

7.9.4 Result Calculation Calculated according to the method in section

7.5.4 of GB/T 11944-2025.

7.10 Initial content of inert gas

7.10.1 Sample The samples were inflatable solar photovoltaic insulating glass products that had been manufactured for more than 24 hours, and the quantity was 5 pieces.

7.10.2 Test Conditions The test was conducted in an environment of 20°C±5°C and relative humidity of 30%~75%. All samples were placed in this environment for at least [duration missing] before the test. 24 hours.

7.10.3 Test Procedure The procedure shall be performed according to the method specified in Chapter 5 of GB/T 38214-2019.The method specified in Chapter 5 of GB/T 38214-2019 is as follows: Arbitration law.

7.11 Gas Tightness Durability

7.11.1 Sample The sample is a flat specimen measuring 510mm × 360mm, made of the same material as the product and under the same process conditions, cured for more than 7 days. The quantity of the samples is 4 pieces (3 for testing, 1 for backup). When the samples are fitted with capillary tubes, they should be treated according to the usage and installation requirements. The sample of crystalline silicon solar photovoltaic insulating glass should contain at least one crystalline silicon cell; thin-film solar photovoltaic insulating glass... The glass sample should be identical to the product.

7.11.2 Test Equipment The test chamber conforms to the temperature change requirements in section

7.5.2 of GB/T 11944-2025 and the provisions of Chapter 5 of GB/T 38241-2019. An inert gas analyzer.

7.11.3 Test Procedure Perform according to the method in section

7.7.3 of GB/T 11944-2025.

7.12 U-value Calculated or determined in accordance with the provisions of GB/T 22476.

8.3 Batching and Sampling

8.3.1 Batching Solar photovoltaic insulating glass produced using the same materials and under the same process conditions constitutes a batch; if the quantity exceeds 500 pieces, each batch consists of 500 pieces.

8.3.2 Sampling The dimensions and deviations of the products are inspected by random sampling from the delivered batch according to Table 4.

8.4 Judgment Rules

8.4.1 Appearance quality, maximum power Appearance quality and maximum power are 100% inspected and must all pass.

8.4.2 Dimensions and their tolerances If the number of nonconforming items is greater than or equal to the nonconformity criteria in Table 4, then the dimensions and deviations of the batch of products are nonconforming.

8.4.3 Light transmittance If all samples meet the requirements, the test is considered (qualified). If one sample fails, two additional spare samples can be taken and retested. If both samples meet the requirements... It must be qualified; otherwise, it is unqualified.

8.4.4 Insulation and Wet Leakage Current If all samples meet the requirements, the test is considered (qualified). If one sample fails, two additional spare samples can be taken and retested. If both samples meet the requirements... It must be qualified; otherwise, it is unqualified.

8.4.5 Resistance to ultraviolet (UV) radiation If all samples meet the requirements, the sample is considered (qualified); otherwise, it is (unqualified).

8.4.6 Dew Point If all samples meet the requirements, the sample is considered (qualified); otherwise, it is (unqualified).

8.4.7 Water vapor seal durability performance If all samples meet the requirements, the sample is considered (qualified); otherwise, it is (unqualified).

8.4.8 Initial content of inert gas If all samples meet the requirements, the sample is considered (qualified); otherwise, it is (unqualified).

8.4.9 Gas Tightness Durability If all samples meet the requirements, the sample is considered (qualified); otherwise, it is (unqualified).

8.4.10 U-value If all samples meet the requirements, the sample is considered (qualified); otherwise, it is (unqualified).

8.4.11 Batch Conformity Judgment During type testing, if any one of the type testing items fails to meet the requirements, the batch of products is considered unqualified. If any item fails the factory inspection, the batch of products is considered unqualified.

9.2 Marking

9.2.1 Packaging Markings Packaging markings should comply with relevant standards and should include product name, manufacturer's name, manufacturer's address, trademark, specifications, quantity, production date, and applicable standards. The product packaging should be labeled with phrases such as "Upside down, handle with care, keep out of rain, keep out of moisture, handle with care to break".

9.2.2 Product Labels Each solar photovoltaic insulated glass unit should have a removable label after installation. The label should include at least the following information.

a) Rated maximum power;

b) Maximum power point voltage and current;

c) Maximum system allowable voltage;

d) Manufacturer, product model, and product serial number;

e) Standard test conditions;

f) Test standards.

9.3 Transportation Product transportation should comply with relevant regulations. During transportation, it should not be laid flat; its length should be aligned with the direction of movement of the transport vehicle; and it should be protected against rain.

9.4 Storage The product should be placed vertically and stored in a dry indoor environment.