With the implementation of local energy storage policies and energy storage incentives in China, PV practitioners have gradually started to talk about optical storage + systems from PV + systems. This article introduces several common types of PV+ systems.

1. Photovoltaic storage + charging pile

With the application of photovoltaic energy storage systems and the popularity of electric vehicles, the combination of these two has received a lot of attention.

① Household optical storage + charging pile

Household optical storage system + charging post system diagram

Working logic: The PV gives priority to the household load, if there is any surplus, it charges the car when it is connected to an electric car and the storage battery when it is not connected to a car. When fully charged, the electricity can be sold to the grid, or if not allowed to be sold, it can be set on the mobile app not to sell electricity. At night, the storage battery is discharged for use by the household load. In the event of a power outage, the PV and batteries are supplied to the off-grid end load only.

② Photovoltaic Carport

Suzhou Zhengrong Guoling Sunrise Tile Villa Building PV Integration Project

The project has a roof area of 108m2, with 41 Sunrise tiles installed on the north and south slopes, and a PV system of 3.7kW; Goodway Sunrise series photovoltaic building materials + GW5048-ESA single-phase energy storage all-in-one machine + smart energy management platform - the project uses Goodway The project adopts Goodway's total power solution, the system is self-generating and self-using, and is integrated into the original distribution system.

2. Photovoltaic Storage + Community PV

Community PV is currently being used in many overseas applications, the following example is a community PV storage project in Alabama, USA.

The project involved 62 households, with a total of 800kWp of PV and 1.5MWh of batteries installed. The households are given priority in the PV storage system for their use, with surplus power shared (sold) and the shortfall taken through the DC bus. The system is dispatched by the EMS system.

Example of a community PV project in Alabama, USA

3. Light storage + whole county promotion

 The county-wide promotion in full swing is not just about selling electricity, more and more provinces are asking for energy storage to be included in the county-wide promotion. For example, in bus terminals, schools, and government offices where there are many rooftops and high electricity consumption.

 The following example shows a light and storage solution for a bus terminal. The system includes PV modules, grid-connected inverters, AC-coupled inverters, batteries, EMS systems, etc., which can effectively reduce the power consumption of the grid, load clipping, and ensure the safety of electricity consumption.

 The working logic is that the PV system supplies daytime bus charging and office power, with the remaining part of the battery charging and the shortfall being supplemented by the grid. Fast charging of electric buses can be supported. In the evening, the battery charges the bus (slow charging), and the shortfall is replenished by the grid. EMS monitors the status of the charging pile, the photovoltaic storage system, and the grid in a unified manner and allocates the power in conjunction with the bus travel schedule. Under special circumstances, the ATS switches to an off-grid power supply to ensure normal power supply to the station control system and safety facilities.

Light storage solution for the bus terminus

In addition to the above PV storage + system, there are also application scenarios such as PV storage + micro-grid, PV storage + DC building, PV storage + sunroom, etc. The optical storage + system may become a new growth point for domestic PV, let's wait and see.