In the field of household energy storage battery, the mainstream batteries are lithium-ion batteries and lead-acid batteries. In the early stage of energy storage development, due to the technology and cost of lithium-ion batteries, it was difficult to obtain large-scale applications.

At present, with the improvement of lithium-ion battery technology maturity, the reduction of large-scale manufacturing costs and policy orientation, the current lithium-ion battery has greatly surpassed the application of lead-acid batteries in the household field. Of course, product attributes also need to match the character of the market. In some markets with outstanding cost performance, the demand for lead-acid batteries is also strong.

Comparison of Lithium Batteries and Lead Acid Batteries

1. Lithium battery has higher energy density.

2. Lithium battery has a longer cycle life. The average cycles times of lead-acid batteries is around 300-500 times, and that of lithium batteries is more than a thousand times.

3. The nominal voltage is different. Lithium-ion batteries are easier to connect in series and parallel, resulting in different battery packs for different projects.

4. Under the same capacity, the volume and weight of lithium batteries are smaller. Lithium batteries are 30% smaller and weigh only one-third to one-fifth of lead acid.

5. Lithium ion battery is more safer. There is a BMS to manage all modules in a unified way.

Important parameters of lithium ion battery

There are two types of conventional household energy storage batteries: high-voltage batteries and low-voltage batteries. The parameters of the battery system are closely related to the battery selection, and need to be considered from installation, electrical, safety, use environment, etc.

Installation parameters

1. Weight/Dimensions

It is necessary to consider the load-bearing of the ground or the wall and whether the installation conditions are satisfied according to different installation methods. It is necessary to consider the available installation space and whether the length, width and height of the battery system will be limited in this space.

2. Installation

How to install at the customer's site, and the difficulty of installation, such as floor-mounted/wall-mounted installation.

3. Protection Degree

Higher protection rating means the battery can support outdoor use.

Electrical parameters

1. Usable Energy

The maximum sustainable output energy of the system is related to the rated energy of the system and the depth of discharge of the system.

2. Operating Energy

This voltage range needs to match the battery input battery range at the inverter side. High voltage or lower than the battery voltage range at the inverter side will cause the battery system to fail to work with the inverter.

3. Maximum Charge／Discharge Current

The battery system supports the maximum charging and discharging current, which determines how long the battery can be fully charged. This current is limited by the maximum current output capability of the inverter port.

4. Rated Power

The rated power of the battery system, and the selected power should preferably support the full-load charging and discharging power of the inverter.

Safety parameters

1. Cell Type

The mainstream batteries are lithium iron phosphate (LFP) and nickel cobalt manganese ternary (NCM). Compared with NCM ternary materials, LFP materials are more stable. CORIGY batteries currently use lithium iron phosphate cells.

2. Warranty

Environmental parameters

1. Operating Temperature

2. Humidity／AltitudeNote: In the household photovoltaic energy storage system, it is also necessary to consider the efficiency of the photovoltaic side, the efficiency of the energy storage machine, and the charging and discharging efficiency of the battery to determine the most suitable components and inverter power range.

Corigy battery is easy for transport, install and maintain. It’s match with Corigy inverter and has been tested before shipped to customer.