Huawei SUN2000 Series User Manual page 48

SUN2000 Smart PV Optimizer
User Manual
Table 6-1 Checking the PV string resistance
PV String
Resistance
(R1 + R2)/2 kΩ is
infinite.
(R1 + R2)/2 kΩ < N
(R1 + R2)/2 kΩ > N
Issue 04 (2023-04-21)
Possible Cause
● The PV string is
● The cables are
Some optimizer
output power
cables are not
connected.
● The actual
● Some optimizer
● PV modules are
● The optimizer is
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Suggestion
● Rectify the open-circuited PV
open-circuited.
● Identify the string cables
not connected
to the same PV
string.
Check whether PV modules and
PV string cables are correctly
connected.
● Check whether the number of
number of
optimizers in the
PV string is
● Check whether PV modules and
greater than
expected.
● Check whether the output
input power
cables are not
connected.
not connected
to optimizers
but directly
connected to PV
strings.
faulty.
string.
correctly.
optimizers in the PV string is
correct.
PV string cables are correctly
connected.
resistance of each optimizer is
normal.
1. Disconnect the output
power cables of the
optimizers in the PV string.
2. Check whether the output
resistance of each optimizer
is normal. For details, see
Table 6-2.
Figure 6-2 Measuring the
optimizer output resistance
6 FAQ
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