Maywah Energy MaySun-1200W-B User manual

Microinverter
MaySun-1200W-B MaySun-600W-B MaySun-300W-B
Dongguan Maywah Electronics Co. Ltd
Add.：3
rd 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-B MaySun-600W-B 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-B MaySun-600W-B User Manual
1. Product description：
1.1 Appearance and instructions
○
1 PV input（MC4）○ 2 PV input（MC4）○ 3 PV input（MC4）○ 4 PV input（MC4）
○
5 AC input- connect to the previous ○ 6 AC output-connect to the next ○ 7 LED display ○ 8 Item No.
1.2 Product dimension：
MaySun-1200W-B
MaySun-600w-B
①
②
⑤
④
⑥
③
⑦
○
8

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MaySun-1200W-B MaySun-600W-B 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
Wifi communication(Options)
1.4 System structure drawing
A：solar panel(PV)
B：MaySun 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 MaySun 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-B MaySun-600W-B User Manual
1.5 Application design sketch

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MaySun-1200W-B MaySun-600W-B User Manual
2. MaySun Microinverters Parameters
Input Data(DC)
MaySun 1200W-B
MaySun 600W-B
MaySun 300W-B
Recommend PV modules
300W×4pcs
300W×2pcs
300W×1pcs
Maximum DC input voltage
50V
MPPT voltage range
25-40V
Operation voltage range
22-50V
One way maximum input current
20A
Output Data（AC）
MaySun 1200W-B
MaySun 600W-B
MaySun 300W-B
Peak power output
1200Watt
600Watt
300Watt
Rated output power
1150Watt
540Watt
270Watt
Rated output current
@120V:9.58A @230V: 5A
@120V:4.8A @230V:2.5A
@120V:2.4A @230V:1.25A
Rated voltage range
@120V:90-140V @230V:180-260V
Rated frequency range
50Hz/60Hz Auto
Power factor
>98%
Maximum unitsper branch
@120V:3PCS @230V: 5PCS
@120V:6PCS @230V: 10PCS
Max-current per branch
30A
Efficiency
MaySun 1200W-B
MaySun 600W-B
MaySun 300W-B
MPPT efficiency
99.5%
Maximum output efficiency
92%
Night power consumption
<70mW Max
Exterior
MaySun 1200W-B
MaySun 600W-B
MaySun 300W-B
Ambient temperature range
-40℃to +60℃
Operation temperature range
-40℃to +82℃
Dimensions (WxHxD)
370mm×305mm×38mm
289mm×200mm×38mm
191×176×38mm
Weight
2.85kg
1.53kg
0.83kg
Waterproof rating
IP65
Cooling
Natural convection - No fans
Feature
MaySun 1200W-B
MaySun 600W-B
MaySun 300W-B
Communication function
Wifi (Options)
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
MaySun 1200W-B
MaySun 600W-B
MaySun 300W-B
Inner box Dimensions
425×370×115mm
340×245×98mm
300x205x115mm
Unit G.W.
4KG
2.6KG
1.27KG
Carton Dimensions
435x380x240mm(2pcs)
435x380x240mm(4pcs)
420x315x365mm
Carton G.W.
8.6KG
11.5KG
6KG

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MaySun-1200W-B MaySun-600W-B 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
Microinverter
1
User Manual
1
Screws(1200W)
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(2 for Maysun-600W)，we recommend to use 4pcs
(2pcs for MaySun-600W) of solar panel to connect with the Microinverte.
MaySun Microinverters input port use standard MC4 connector, please check if there have MC4
connector of solar panel.

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MaySun-1200W-B MaySun-600W-B User Manual
3.1.4 Confirm the voltage and frequency of the MaySun Microinverter 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 Maysun 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 Maysun 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-B MaySun-600W-B User Manual
3.2.2 Use the AC cable to connect the neighboring Maysun Microinverters, and the end terminal of
cable connect to the AC box.
L
N
E
3.2.3 Covered the solar panel with opaque object, then connect the Maysun Microinverter with the 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
Maysun-1200W Microinverters(10PCS for Maysun-600W) for each
branch; if the AC output voltage in the range of 100-130V, the maximum
is 3pcs Maysun1200w Microinverters(6pcs for Maysu-600W) for each
branch; the maximum current is 30A for each branch.
Maysun1200W have 4 DC input ports(Maysun600W have 2), each
input port can connect maximum 350W(20A), over power or over
current will damage the Maysun Microinverters.

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MaySun-1200W-B MaySun-600W-B 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 Maysun Microinverters, if the LED in green, congratulations, you complete
finish the installation.
4. LED instructions：DC power supply the LED，if the DC voltage around 10.5V, the LED will light up.
1、LED in green：
LED stable green ：Microinverter work，MPPT locked.
LED flicker green：Microinverter work，MPPT is been tracking.
2、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.
5. 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.