Growatt MTL-S - 1.3 PV Isolation Low

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: 02 8065 1298
Email: australia@ginverter.com
Email:
ausupport@ginverter.com
www.ginverter.com
volt higher, thus is 265 volt.
(3) Then click “Operate” to apply the change. Once inverter accepted, it would show “Set
OK” in “Set Result” filed.
(4) Tick the “Read” checkbox, and click “Operate” to read and check the change.
After BOTH of the above adjustment had been done successfully (For new version inverters
installed after 9, October, 2016), please switch ON the AC switch to start up inverter.
1.3 PV Isolation Low
Cause: Insulation problem.
Error message
Description
Solutions
PV Isolation Low
Insulation problem
Error message
shown on the screen
all the day
Contact Growatt
to claim warranty
Message can only be
found in mornings,
and will disappear in
the afternoon.
Inspection
needed, it could
be a leakage on
DC side anywhere
from panels to DC
isolator, including
earth wires and
solar panels
Inspection procedure of insulation problem on site:
Check the earth wiring on AC side, check the isolation on DC side (PV side).
1. Check if the inverter’s AC side is well grounded,
2. Switch off the DC isolator, unplug the DC connectors, test the positive to earth and
negative to earth voltage or resistance on the DC MC4 plugs. If the voltage is not 0, please
check the earth wire of the solar panels.
3. Turn on the DC switch to measure the voltage of DC positive to ground and the voltage of
DC negative to ground. The reading will be 0 under normal condition, if the voltage is not 0,
you can locate the fault area by dividing the voltage by Voc of PV solar module, as a panel
with Voc=21v , if the test indicate that the Positive to ground voltage is 42V, Negative to
ground voltage is 63V, then the fault is located between the 2 and 3 panels from positive
side.