Sea-Shield

Dual-POE encapsulation

Sea-Shield uses dual-POE encapsulation on both sides of the solar cells to reduce moisture penetration and protect the internal electrical structure. The material's high electrical resistivity also helps limit potential-induced degradation (PID), supporting reliable energy generation in humid marine environments.

Water vapour transmission rate (WVTR), g/m²/day

Conventional EVA

34.6

Dual-POE

8.2

Volume resistivity, EVA = 1x

Conventional EVA

Dual-POE

2.5x

In LONGi's material testing

The dual-POE encapsulant demonstrated approximately 76% lower water vapour transmission and 2.5 times higher volume resistivity compared with conventional EVA.

Marine-resistant glass

Sea-Shield features specially developed corrosion-resistant glass with a dense protective barrier designed to withstand prolonged saltwater exposure. The protective surface helps limit glass corrosion and preserve light transmission in demanding marine environments.

~2%

higher light transmittance than conventional glass

In LONGi's comparative testing

Sea-Shield glass maintained approximately 2% higher light transmittance than conventional glass during exposure to a 5% sodium chloride solution at 35°C.

Corrosion-resistant aluminium frame

Sea-Shield features a corrosion-resistant aluminium frame with a protective oxide layer approximately 50% thicker than that of a conventional frame. The reinforced surface protection helps reduce corrosion caused by salt spray, supporting long-term frame durability in marine environments.

Protective oxide layer, relative thickness

Conventional frame

1.0x

Sea-Shield frame

about 1.5x

In LONGi's comparative testing

The Sea-Shield frame showed no visible surface abnormalities after 60 days of salt mist exposure, while the conventional frame exhibited substantial surface corrosion. The Sea-Shield frame also passed a separate 192-hour CASS corrosion test.

Enhanced junction box and connector sealing

Sea-Shield features an enhanced sealing system for its junction box and connectors, including silicone-rubber O-rings and additional waterproof and dustproof stoppers. These protective elements help prevent seawater ingress and reduce corrosion risks at sensitive electrical connections.

100%

of tested junction boxes and connectors passed the insulation-resistance assessment

Seawater immersion test duration

0 h1,560 h3,120 h (130 days)

In LONGi's seawater immersion test

100% of the tested Sea-Shield junction boxes and connectors passed the insulation-resistance assessment after 3,120 hours (130 days). Conventional reference products showed significantly higher failure rates under the reported test conditions.

Schematic model. Layer spacing and connector size are exaggerated for clarity and are not to scale. Frame outline from LONGi CAD (2382 x 1134 x 30 mm); junction boxes and connectors modelled from LONGi product renders.