Direct contact between different materials in the photovoltaic racking system may lead to electrolytic corrosion, so it is important to pay attention to insulation protection when designing and installing. At present, there are three main types of PV racking structures commonly used in China: concrete pv racking, steel pv racking and aluminium alloy pv racking.

(1) Concrete pv bracket is mainly used in large-scale photovoltaic power station, because of its weight can only be placed in the field, and the foundation of the better areas; but high stability, can support the huge size of the solar panels.

(2) Steel pv bracket has stable performance, mature manufacturing process, high bearing capacity, easy to install, has been widely used in civil, industrial solar photovoltaic and solar power stations. Among them, the steel profiles are all factory-produced, with uniform specifications, stable performance, excellent anti-corrosion performance and beautiful appearance. Especially the combination of steel solar bracket system, its on-site installation, only need to use specially designed connectors will channel steel splicing installed, construction speed, without welding, thus ensuring the integrity of the anti-corrosion layer. The disadvantage of the combined pv steel bracket system is the complexity of the connecting parts process, a wide variety of manufacturing, design requirements are high.