Grid-Tied And Off-Grid Ess; Grid-Tied And Off-Grid Ess Networking - Huawei LUNA2000 Series User Manual

LUNA2000-(5-30)-S0
User Manual


3.2 Grid-tied and Off-grid ESS

The grid-tied and off-grid ESS is mainly used to supply power to loads when the grid is
unstable and there are primary loads. The grid-tied and off-grid ESS switches the inverter to
the grid-tied or off-grid state through the Backup Box. When the grid fails, the inverter
switches to the off-grid state and supplies power to primary loads in backup mode. When the
grid recovers, the inverter switches back to the grid-tied state.

3.2.1 Grid-tied and Off-grid ESS Networking

Networking 1: Inverter + Batteries
The grid-tied and off-grid ESS consists of the PV strings, LUNA2000 batteries, inverter, AC
switch, load, Backup Box, PDU, and grid. The grid connection status of the inverter is
switched by using the Backup Box.
Figure 3-7 Grid-tied and off-grid ESS basic networking diagram
Networking 2: Inverter (with Batteries) + Inverter (Without Batteries)
The grid-tied and off-grid ESS supports inverter cascading. One inverter connects to and
manages batteries, and the other inverter is used to generate extra energy. The Backup Box
can be connected to only one inverter.
Issue 01 (2020-09-18)
In this mode, Fully fed to grid is selected. For details, see
Copyright © Huawei Technologies Co., Ltd.
3 Application Scenarios and Settings
6.3 Battery Commissioning.
27