What are the differences between off-grid and on-grid solar inverters?

Solar inverter

The use of solar inverters is to transfer the DC electricity emitted by solar panels into AC power. All the electricity emitted by solar panels can be exported to the home appliances through the processing of the inverter. : Divide the network and grid.

30-60kW Hybrid Inverter
solar inverter

How to distinguish the off-grid and on-grid solar inverters in terms of function and use?

Off-grid inverter:

The inverter usually uses a complete system processing scheme of module components, consisting of many supervised constructs: solar inverters, controllers, power generation modules, and system control boards. The inverter is the system that is separated from the public power grid. The DC electricity emitted from the solar panel is stored in the battery, and then the battery is transported to the icing network inverter. Using it, you can also return to the battery storage. It is more applicable to some areas covered by electrical networks such as: plateau and forest areas. It can ensure the needs of electrical energy at any time and meet the needs of electricity equipment.

On-grid inverter:

Types of grid -connected inverters: solar grid -connected inverters, wind power grid -connected inverters, electrical equipment power generation reactors, and other power generation equipment grid -connected inverters.

The grid -connected inverter is usually suitable for the system of large power generation stations. Many parallel photovoltaic groups are connected to the DC input end of the same inverter in the same inverter. Usually, the power module of the three -phase IGBT module is large. Smaller the field effect transistor, at the same time, uses a DSP switching controller to improve the quality of the output power, so that it is particularly close to sine wave current. The biggest difference between the grid -connected inverter is not to do any battery storage. The DC electricity formed from solar panels can be directly switched to the AC power through the inverter and sent to the public power system. The public power system needs to meet the relevant regulations and policies of the local power grid, otherwise it cannot provide grid.

If the power grid is power off, the grid -connected inverter needs to be quickly offline with the grid. This is the rule of the National Electrical Specification (NEC) to ensure that when the power grid is disconnected, the grid -connected inverter will not provide electricity to the power grid. At this time, the workers who repair the power grid will not shock.

If it is properly configured, the grid -connected inverter allows a family to use its self -generating alternative energy (such as solar or wind power) without the need for complicated wiring or battery. If it is insufficient alternative, the insufficient part will still be provided by the power of the grid.

In the AC photovoltaic power generation system, due to various technologies or policy reasons, there are counter -electrical appliances to the national unified grid, and there are also inverse appliances that have no grid to connect to the national unified power grid. Type inverter and photovoltaic grid -connected inverter.

The main differences between the two are as follows:

1. Different functional mechanisms

The photovoltaic departure mesh inverter is a power transformation device, pushing the input DC electricity, and then the inverted bridge SPWM pulse width modulation technology inverted to 220V AC power. Photovoltaic grid -connected inverter is a special inverter. In addition to the transaction flow power that can be converted by DC electricity, its output AC power can be synchronized with the frequency and aspects of the municipal electricity, so the AC power output can be returned to the public power grid.

2. Different protection mechanisms

Photovoltaic extension inverters have various protection functions such as input reflective protection, input -under pressure protection, input over voltage protection, output over voltage protection, output overload protection, output short -circuit protection, overheating protection, etc. The instrument has international protection level certification, which is mainly aimed at the protection ability of products related to solid foreign objects and water.

3. Different technology

The photovoltaic deduction uses the SPWM method. When the narrow pulse that is equal and the shape of different shapes is added to the inertia link, the effect is basically the same; The industrial frequency transformer, or the inverter architecture of the transformer.

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