Photovoltaic off-grid power generation system is specifically for use in non-grid areas or areas with frequent power outages. It does not rely on the power grid, but relies on the working mode of "storage while using" or "storage before use". The off-grid system has strong practicability for households in ungrid areas or frequent power outage areas.
What equipment does PV + energy storage need?
Photovoltaic module
When it comes to photovoltaics,maxpower inverter, of course, photovoltaic modules are indispensable. Generally, crystalline silicon modules are commonly used in the market, and crystalline silicon is divided into monocrystalline silicon and polysilicon two kinds. Although the conversion rate of single crystal is 1-2% higher than that of polycrystal theoretically, the electricity emitted by photovoltaic power stations with the same capacity is theoretically the same with single crystal modules and polycrystalline modules. Specific specifications can be selected according to the system requirements specific matching voltage.
Photovoltaic support
Photovoltaic bracket should also be familiar to everyone, in the grid-connected system, the market is common for aluminum alloy bracket, steel bracket and non-metallic bracket, of which non-metallic bracket is used less, and aluminum alloy bracket and steel bracket have their own characteristics. Aluminum alloy bracket can be selected for household roof power station with bearing requirements or industrial plant roof power station with corrosion resistance requirements; Power stations with strong wind and large span can choose steel support.
Off-grid switchgear
Control the whole circuit switch and lightning protection.
Energy storage battery
Energy storage battery is the core part of the off-grid system. Solar modules charge the energy storage battery through the controller, and the battery is used by the user through the off-grid inverter. Energy storage battery is commonly used in the photovoltaic off-grid system, which is called colloidal battery. Of course, there are lead-acid batteries, ternary lithium batteries, lithium iron phosphate batteries and so on.
Solar controller
The main function of the controller is to control the overshoot and overdischarge of solar energy and energy storage battery to protect the service life of the battery. General controller with light control function, charging state during the day automatically stop discharging, night dark start discharging without charging. This is why we usually see the solar street lamp no one to control the day automatically off, the night automatically bright reason. The maximum charging current of the controller is different for different solar modules. For example, for a 48V30A controller, the charging current of the solar module must be lower than 30A, otherwise the controller will be damaged.
Photovoltaic cable
Photovoltaic cables have the advantages of high temperature resistance (generally 120°C), anti-aging, anti-ultraviolet, anti-corrosion, and can withstand harsh weather environment and mechanical impact. Photovoltaic cable in outdoor environment, the service life is 8 times that of ordinary cable, is 32 times that of PVC cable.
Photovoltaic off-grid inverter
The difference between off-grid inverters and grid-connected inverters is that grid-connected inverters need to be connected to the power grid to work normally, while off-grid systems need to work with energy storage batteries. The off-grid inverter with matching voltage should be selected according to the system requirements. At present, it is common to see the inverter control machine on the market is to combine the controller and the inverter together in order to improve the more beautiful products.