Off grid energy storage vs. hybrid energy storage?

In the context of the booming development of renewable energy, energy storage inverters play a crucial role as key components connecting renewable energy systems with the grid or loads. Among them, off grid energy storage inverters and hybrid energy storage inverters have become two widely concerned types due to their unique working methods and application scenarios. This article will briefly introduce the basic principles of these two inverters and focus on explaining their main differences.

01 Functional Features

Off grid energy storage

The main function is to convert the direct current generated by solar panels into alternating current for use by loads.

2. Energy storage batteries are usually equipped to store excess electrical energy and release it when needed.

3. Independent operation, not dependent on the power grid, suitable for remote or areas without grid access.

Hybrid energy storage

1. It has both off grid and grid connected functions, which can convert the direct current generated by solar panels into alternating current for load use, and can also be connected to the grid to achieve bidirectional power flow.

2. When the power supply of the grid is normal, electricity can be obtained from the grid to supplement the shortage of solar power generation; When there is a power outage in the grid, it can be switched to off grid mode to provide power to the load.

3. It has efficient inverter capability and intelligent charging function, which can automatically adjust charging parameters according to battery status and extend battery life.

02 Application Scenarios

Off grid energy storage

1. Mainly used in remote mountainous areas, deserts, islands and other areas without power grid access or unstable power grid.

2. Suitable for households, small commercial projects, or occasions that require independent power supply.

Hybrid energy storage

1. Suitable for situations where there is grid access and where solar power generation is desired to reduce electricity bills or achieve energy self-sufficiency.

2. Suitable for various occasions such as homes, businesses, and public facilities, especially in areas where power supply is unstable or where energy efficiency needs to be improved.

03

The difference between the two

operation mode

Off grid energy storage: When there is excess electricity or photovoltaic power generation in the grid, the electrical energy is stored in battery packs. When electricity is needed, convert the direct current in the battery into alternating current for power supply.

Hybrid energy storage: capable of automatically switching between grid connected and off grid modes based on the grid status. In grid connected mode, the surplus electricity from renewable energy sources is integrated into the power grid; In off grid mode, use the electrical energy from the battery pack to supply power.

Application scope

Off grid energy storage: suitable for remote areas, islands, nomadic areas and other environments without power grids or unstable power supply.

Hybrid energy storage: suitable for large-scale renewable energy power plants, microgrids, and other occasions that require both grid connected and off grid requirements.

Protection level

Off grid energy storage: generally installed indoors, with lower protection level requirements, usually IP20.

Hybrid energy storage: Due to its main installation in outdoor, rooftop and other scenarios, it requires a high level of protection, generally reaching IP65 or above.

Complexity level

Off grid energy storage: The system is relatively simple and mainly focuses on self-sufficiency.

Hybrid energy storage: The system is more complex, with more functions and more complex control strategies, and can better adapt to various complex power environments.

Price and lifespan

Due to the higher complexity of hybrid energy storage inverters, their cost is usually higher than that of off grid energy storage inverters, resulting in higher energy utilization efficiency and system stability.

In summary, off grid energy storage inverters and hybrid energy storage inverters each have their own advantages and applicable scenarios. Users should comprehensively consider factors such as actual needs, cost budget, and application scenarios when making choices.