21
ERROR
MESSAGE
EXPLANATION REASON SOLUTIONS
Isolation
Failure
Ground insulation
impedance of
Battery is to low
Isolation failure
could be caused
by multiple
reasons like
battery not being
grounded well, DC
cable is broken,
battery are aged
or surrounding
humidity is
comparatively
heavy, etc.
1. Use multi meter to check if the resistance
between earth & inverter frame is about zero. If
it's not, please ensure that the connection is well.
2. If the humidity is too high, isolation failure may
occur.
3. Check the resistance between BAT to earth and
PV to earth, if the resistance is lower than 100k,
check the system wiring connection.
4.Try to restart the inverter, check if the fault is
still occurs, if not, means it is just an occasional
situation, or contact after-sales.
Ground
Failure
Ground leakage
current is too high
Ground failure
could be caused by
multiple reasons
like that the
neutral cable on
the AC side is not
connected well or
the surrounding
humidity is
comparatively
heavy, etc.
Check (use multi-meter) if there is voltage
(normally should be close to 0V) between earth
& inverter frame. If there is a voltage, it means
the neutral & ground cables are not connected
well on the AC side. If it happens only in the
early morning/dawn /rainy days with higher air
humidity and is recovered soon, it should be
normal.
Relay Check
Failure
Self checking of
relay failure
Neutral & ground
cables are not
connected well on
AC side or just an
occasional failure
Check (use multi-meter) if there is high voltage
(normally should be lower than 10V) between N
& PE cable on the AC side. If the voltage is higher
than 10V, it means the neutral & ground cable are
not connected well on AC side or restart inverter.
DC Injection
High
/ Inverter detects
a higher DC
component in AC
output
Try to restart the inverter,check if it still occurs. If
not,it is just an occasional situation. Otherwise,
contact after-sales immediately.
EEPROM R/W
Failure
/ Caused by a strong
external magnetic
eld etc.
Try to restart the inverter,check if it still occurs. If
not,it is just an occasional situation. Otherwise,
contact after-sales immediately.
SPI Failure Internal
communication
fails
Caused by a strong
external magnetic
eld etc.
Try to restart the inverter,check if it still occurs. If
not,it is just an occasional situation. Otherwise,
contact after-sales immediately.
DC Bus High BUS voltage is too
high
/ Try to restart the inverter,check if it still occurs. If
not,it is just an occasional situation. Otherwise,
contact after-sales immediately.
Back-Up Over
Load
Back-up side is
over loaded
Total back-up load
power is higher
than the back-up
nominal output
power
Decrease back-up loads to make sure the total
load power is lower than back-up nominal output
power.
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