17
18
7. Working Modes
The Z21 series inverters have the following main operating modes providing for different conditions:
Mode1
：
Energy produced by the PV system is first used for the
local load, the excess energy is then used for charging
batteries, and then finally feeding into the grid.
Mode2
：
If there are no PV panels, battery energy is used for the
local load first, the grid also can supply power when the
battery capacity is insufficient.
Mode3
：
If the grid is faulty or there is no grid, the system can still
operate, PV panels and batteries supply energy for the
local load. There is a BACKUP port on the inverter for
emergency power supply.
Mode4
：
The battery can be charged by the grid, charging time
and power can be set up adaptably.
An error message will be displayed on the APP if a fault occurs.
Table 8-1 is
the
Description of Error Message
Error message
Utility Loss
Fac Failure
PV Over Voltage
Over Temperature
Isolation Failure
Ground I Failure
Relay-Check Failure
DC Injection High
EEPROM R/W Failure
SPI Failure
DC Bus High
AC HCT Failure
GFCI Failure
Vac Failure
Battery Over Temperature
Battery Under Temperature
Battery Cell Voltage Differences
Battery Over Total Voltage
Battery Discharge Over Current
Battery Charge Over Current
Battery Under SOC
Battery Under Total Voltage
Battery Communication Fail
Battery Output Short
Description
Grid disconnected
Grid frequency no longer within permissible range
Overvoltage at DC input
Over temperature on the case
Ground insulation impedance is too low
Too high ground leakage current
Relay self-checking failure
Too high DC injection
Memory chip failure
Internal communication failure
Too high BUS voltage
Output current sensor failure
Detection circuit of ground leakage current failure
Grid voltage no longer within permissible range
Battery Over Temperature
Battery Under Temperature
Li-Ion Battery Cell Voltage Differences
Li-Ion Battery Over Total Voltage
Battery Discharge Over Current
Battery Charge Over Current
Battery Capacity Low
Battery Under Total Voltage
Battery Communication Fail
Battery Output Short
8 Error Messages
Table 8-1