Huawei LUNA2000-5-S0 - 4.2 Grid-tied and Off-grid ESS

Figure 4-10 fully fed to grid
4.2 Grid-tied and O-grid ESS
● The grid-tied and o-grid ESS is mainly used to supply power to loads when
the grid is unstable and there are primary loads. The grid-tied and o-grid
ESS switches the inverter to the grid-tied or o-grid state through the Backup
Box. When the grid fails, the inverter switches to the o-grid state and
supplies power to primary loads in backup mode. When the grid recovers, the
inverter switches back to the grid-tied state.
● The grid-tied and o-grid ESS must be equipped with batteries. Otherwise,
the o-grid output will be abnormal when the PV voltage is too low.
4.2.1 Grid-tied and O-grid ESS Networking
Networking 1: Single Inverter（Backup Box）
The grid-tied and o-grid ESS consists of the PV strings, LUNA2000 batteries,
inverter, AC switch, load, Backup Box, PDU, Smart Power Sensor and grid. The grid
connection status of the inverter is switched by using the Backup Box.
LUNA2000-(5-30)-S0
User Manual 4 Application Scenarios and Settings
Issue 15 (2024-01-12) Copyright © Huawei Digital Power Technologies Co., Ltd. 49