Manual Solis V1.0 (page 23 of 34) (Dutch)

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4.3.3 PC Discrete Rate Analysis

Dispersion rate is an index to describe string current fluctuation and also to evaluate string’s

continuity of power generation, which is indicating the health status of the plant. The less the

dispersion rate is, the more stable the plant is running and the better the power generation is.

Otherwise, defective bypasses might exist which may affect the power generation.

[Operation Prerequisite]

1) Dispersion rate analysis time is 10am to 14pm every day. Please check the dispersion rate

analysis result after 10am for that day;

2) Number of input strings to the inverter is equal to or larger than 6;

3) Real-time power of inverter is larger than 10% of rated power.

[Hint] If there are some strings not connecting to PV panels, or their connected power is far

different from others’, it is not recommended to add these strings to the dispersion rate analysis

(click on these strings to set)

[Function Operation]

1) Function location: click [O&M] -Dispersion Rate Analysis, check single device for its

dispersion rate curve and data;

2) Check string dispersion rate data for each plant device and if necessary export the

dispersion rate data;

3) Set necessary strings to not participate into dispersion rate calculation.

Based on a rule of thumb in the following intervals, inspect all strings that either have

zero current or obvious low current on site.

10-20% 5-10%0-5%

20%+Abnormal

Communication

faults in AC

combining box

or inverters

Some strings might

have disconnection

or breakage

Some strings have

obvious lower power

output comparing

with other strings

As a rule of thumb,

some strings have

low power output

when the dispersion ratio

is higher than 7%

Normal

4 . Platform Operations

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Solis V1.0 Manual

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