Maywah Energy MaySun-1200W User manual

MaySun-1200W Microinverter
Dongguan Maywah Electronics Co. Ltd
Add.：3rd Floor, Shenzhou Science And Technology
Park,No.37 Xingwu Rd., Wusha Community,
Changan Town, Dongguan, Guangdong, China
Tel：[phone]
Fax: [phone]
© All rights reserved

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MaySun-1200W User Manual
Important Safety Information，Read this First！
This manual contains important instructions to follow during installation and maintenance of the
Microinverter. To reduce the risk of electrical shock, and to ensure the safe installation and operation of the
Microinverter, the following safety symbols appear throughout this document to indicate dangerous
conditions and important safety instructions.
Safety Instructions：


Perform all electrical installations in accordance with all local electrical codes.
Be aware that only qualified personnel should install and/or replace Microinverters.
Connect the Microinverter to the electrical utility grid only after receiving prior approval from the utility
company，and only qualified electrical engineer can perform the operation.
Non-professionals do not disassemble or repair the inverter. If the inverter fails, please contact your
dealer or manufacturer.
Before installing or using the Microinverter, please read all instructions and cautionary markings in the
technical description and on the Microinverter system and the PV-array.
Please install the inverter in ventilated place and away from flammable materials.
Do NOT disconnect the PV module from the Microinverter before removing AC power.
The inverter transform solar photovoltaic (PV) DC power into AC power and fed into the power grid. Do
not use this product for other purposes, for any damage and loss resulting from non-intended use, the
manufacturer / supplier disclaims all responsibility.
Warning Sign This indicates a situation where
failure to follow instructions may be a safety hazard or
cause equipment malfunction. Use extreme caution and
follow instructions carefully.
Heat Sign Burn hazard, if not follow instruction may be
burned. Use extreme caution and follow instructions
carefully.
Be aware that the body of the Microinverters is the heat sink and can reach
a temperature of 80 ℃
under extreme conditions. To reduce risk of burns,
do not touch.
Please install the inverter where children can not reach to reduce risk of
shock and burns. Minors and mental patients prohibition use of this
products.

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MaySun-1200W User Manual
1. Product description：
1.1 Appearance and instructions
①PV input（MC4）1
②PV input（MC4）2
③PV input（MC4）3
④PV input（MC4）4
⑤AC input- connect to the previous
⑥AC output-connect to the next
⑦LED display
⑧Item No.
1.2 Product dimension：
①
②
⑤
④
⑥
③
⑦
○
8

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MaySun-1200W User Manual
1.3 Product features：
MPPT(maximum power point tracking)，effectively track and lock maximum power output
of solar panels
When the inverter track the maximum power point of the solar panel, it will automatically
locked and with stable output
4 independent MPPT（MPPT）
standard MC4 input port，easy and safe installation
Integration AC output port
Pure sine wave output
anti-islanding protection function：inverter will automatically stop output when the utility
grid off or fault.
Over-temperature protection, short current protection and over-load protection
IP65 waterproof function
1.4 System structure drawing
A：solar panel(PV)
B：MaySun-1200W Microinverter
C：AC cable
D: AC distribution box
E：home utility
F: low voltage utility grid
Description：Connect 4PCS of solar panel to 1pc of MaySun1200W Microinverter. The inverter use
MPPT function to absorb the maximum energy from solar panels, then use high efficiency inverter
conversion to transform the DC to AC, and then use the synchronous high-frequency modulation
and 0 phase offsets technology to achieve delivery the energy input to the utility grid.
A
B
c
D
E
F

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MaySun-1200W User Manual
1.5 Application design sketch

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MaySun-1200W User Manual
2. MaySun1200W Parameters
Input Data(DC)
MaySun 1200W
Recommend PV modules
300W×4pcs
Maximum DC input voltage
50V
MPPT voltage range
25-40V/14-20V
Operation voltage range
10.5-50V
One way maximum input current
20A
Output Data（AC）
@120VAC
@230VAC
Peak power output
1200Watt
1200Watt
Rated output power
1150Watt
1150Watt
Rated output current
9.58A
5A
Rated voltage range
90-160VAC
180-260VAC
Rated frequency range
50Hz/60Hz Auto
50Hz/60Hz Auto
Power factor
>98%
>98%
Maximum units per branch
3pcs（single phase）
5pcs（single phase）
Permission Max-current per branch
30A
30A
Efficiency
@120VAC
@230VAC
MPPT efficiency
99.5%
99.5%
Maximum output efficiency
92%
92%
Night power consumption
<50mW Max
<70mW Max
Exterior
Ambient temperature range
-40℃to +60℃
Operation temperature range（inverter inside）
-40℃to +82℃
Dimensions (WxHxD)
370mm×305mm×38mm
Weight
2.85kg
Waterproof rating
IP65
Cooling
Natural convection - No fans
Feature
Power transmission mode
Reverse transfer, load priority
Electromagnetic compatibility
EN50081.part1 EN50082.part1
Grid disturbance
EN61000-3-2 Safety EN62109
Grid detection
DIN VDE 1026 UL1741
Package
Inner box Dimensions
430×375×115mm
Unit G.W.
4KG
Carton Dimensions
440x410x265mm
Carton G.W.
8.6KG

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MaySun-1200W User Manual
3. Installation
3.1 Notes before installation
3.1.1 Check the product and the parts if complete, the list as below:
Product or parts name
Quantity
MaySun-1200W Microinverter
1
User Manual
1
Screws
1
Auxiliary support
1
AC cable
1
3.1.2 Check the installation Ambient if as requested：
Local ambient temperature is -20℃~60℃；
No easy corrosive gas or liquid nearby；
Not be installed in easily flooded or snow-covered areas；
Not be installed in an enclosed or non-ventilated place；
Prohibition install it near flammable materials；
Not be installed in direct sunlight；
Install the Microinverter in the place where children can not touch.
3.1.3 Solar panel if as requested：
Recommend to use 60cells or 72cells solar panel，the Voc must be in the range of the
inverter’s operation voltage range. If you use 36cells solar panel, you can connect 2pcs
in series then connect to Micoinverter, and the total power can’t over 350W.
There have 4 input ports of the MaySun-1200W，we recommend to use 4pcs of solar
panel to connect with the Microinverte.
MaySun-1200W input port use standard MC4 connector, please check if there have
MC4 connector of solar panel.

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MaySun-1200W User Manual
3.1.4 Confirm the voltage and frequency of the MaySun-1200W which you ordered is match with
your local utility grid.
Except bracket, solar panel, inverter and other related parts, you also need the below
tools and parts:
Screw driver
Monkey wrench
Wire stripper
AC distribution box
breaker
3.2 Installation step:
3.2.1
3.2.2
3.2.3
3.2.1 Fix the Maysun1200W Micorinverter in the right position according to the bracket and
junction box.（eg. Install it in the middle of the 4 solar panels.）
Prohibition to connect the Maysun1200W Microinverter to utility grid
if do not install the inverter following the below steps.
Please determine the installation site refer to 3.1.2
Make sure the inverter and bracket grounding, otherwise install a
dedicated line for the inverter of grounding.

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MaySun-1200W User Manual
3.2.2 Use the AC cable to connect the neighboring Maysun1200W Microinverters, and the
end terminal of cable connect to the AC box.
3.2.3 Covered the solar panel with opaque object, then connect the Maysun1200W
Microinverter with the 4pcs of solar panel.
Select the right earth leakage protection switch and breaker according
to the system maximum current.
Before connect the AC box, make sure do not connect to utility grid.
If the AC output voltage in the range of 200-250V, the maximum is 5pcs
Maysun1200W Microinverters for each branch; if the AC output voltage
in the range of 100-130V, the maximum is 3pcs Maysun1200w
Microinverters for each branch; the maximum current is 30A for cach
branch.
Maysun1200W have 4 DC input ports, each input port can connect
maximum 350W(20A), over power or over current will damage the
Maysun1200W.

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MaySun-1200W User Manual
3.2.4 Check all the terminal in right and stable connected ,then connect to utility grid and
remove the opaque object on the solar panel.
3.2.5 Check the LED on the Maysun1200W, if the LED in green, congratulations, you
complete finish the installation.
1、LED instructions：DC power supply the LED，if the DC voltage around 10.5V, the LED will light up.
2、LED in green：
LED stable green ：Microinverter work，MPPT locked.
LED flicker green：Microinverter work，MPPT is been tracking.
3、LED in red：
LED stable red：protection statue，check ○
1DC voltage if low（below 10.5V）or high（above
50V）○
2Utility grid power off or the utility voltage is not match the Microinverter ○ 3Short circuit
of AC terminal.
Red Green Flashing：○
1Microinverter start to work；○ 2input voltage or current not stable, pls
check if there have enough current from the solar panel.
4. Steps for replace fault Microinverter：
1、Use opaque object to cover the solar panels which connect to the fault Microinverter；
2、Disconnect the fault Microinverter and utility grid；
3、Disconnect the fault Microinverter and AC cable；
4、Disconnect the fault Microinverter and solar panel；
5、Remove the fault Microinverter from the bracket；
6、Fix the new Microinverter to the bracket；
7、Connect the new Microinverter to the AC cable；
8、Connect the new Microinverter to the solar panel；
9、Connect the new Microinverter to the utility grid；
10、Remove the opaque object on the solar panel.