7
8
The MAX-X series inverter works as follows:
1>The PV panels gather solar to generate DC power to inverter.
2>With input current detection circuit, it can monitor all the PV panels' working status
and use MPPT to track the maximum power point.
3>With inverter circuit change DC power to AC power, and feed power back to grid per
grid reuqirement.
4>With
output
isolation
relay
can
isolate
AC
output
and
grid
,
if
anything
goes
wrong on
either
inverter
side
or
grid
side
,
isolation
relay
can
disconnect
inverter
immediately.
3.4 Working Principle
3.5
Inverter Storage
3.7 AFCI Detection Function
3.8 Anti-PID Function
3.6 Grid Types
On
-
grid
connection system diagram:
Fig
3
.
4
symbol
A
B
C
D
PV
string
Inverter
Electric meter
Gird
symbol
Description
Description
1>Do not unpack the inverter and store it in a ventilation dry place .
2>Keep the storage temperature at -30
℃
- +60
℃
and humidity at 0-95%.
3>A maximum of three inverters with package can be stacked.
4>If the inverter has been long-term stored, inspections and tests should be conducted
by qualified personnel before it is put into use.
After being stored for a month or longer, the inverter's time and date
could be wrong, you need set the time and date before using, for more
details please refer to Chapter 7.1 inverter commissioning.
The MAX-X series, MAX100-133KTL3-X LV inverters connect to the grid like following
drawing 3.5,MAX 125-150KTL3-X MV inverters connect to the grid like following
drawing3.6.
400V
400V
400V
230V
230V
230V
480V
4 80V
480V
Fig
3
.
5
Fig
3
.
6
AFCI (Arc Fault Circuit Interrupter) is a kind of circuit protection device, the main
function is to prevent the fire caused by fault arc.The electrical insulation aging,
breakage, loose connection, air breakdown caused by air humidity and so on, all of these
may cause an electric spark,which is called arc.
The AFCI function of the MAX-X series inverter is optional, and the detection equipment
is assembled inside the inverter. When an arc-drawing condition is detected on the PV
input side, the arc current could be detected by the CT assembled on the PV input-side
wire. Then the inverter will shut down. Meanwhile, the inverter will display the
corresponding fault message and the buzzer will sound, which could help to avoid harm
and economic loss to the user.
The full name of PID is Potential Induced Degradation. Since the PID effect, a large
amount of charge could accumulate on the surface of the photovoltaic module, which
makes the surface passivation of the module worse. Eventually, the fill factor, open-
circuit voltage, and short-circuit current of the module are reduced, and the power of the
photovoltaic module is attenuated.
The Anti-PID function uses the principle of reversible PID changes. MAX-X series inverters
rectify AC voltage at night and boost it to generate a DC voltage. The DC voltage is
connected to PV + and the ground respectively. When add a positive bias voltage to the
module to make the PID effect reverse,the Anti-PID function could repair the
photovoltaic modules at night and prolong the service life of photovoltaic modules.
NOTE:
Anti-PID function is optional.
NOTE:
AFCI function is optional.
A
B
C
D
