Massimo MEI 1200 User manual

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Table of Contents
General Information ………………………………… 2
Before Installation …………………………………… 4
Installation …………………………………………… 6
Connecting the Cables ……………………………… 11
Important Performance Check ………………………… 12
Troubleshooting ……………………………………… 13
Specifications …………………………………………… 14
Warranty Terms ……………………………………… 15

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General Information
This pure sine wave inverter is designed meet the requirements of a complete off--grid
solar system. It converts DC12V power to AC120V power, the common household
power that charges and operates a wide range of electric appliances, including laptops,
cellphones, digital cameras, fans, music players, air conditioners, and more.
Note: Pure sine wave power is similar to the waveform of grid power. In a pure sine
wave, the voltage rises and falls in a smooth and clean fashion with very low harmonic
distortion, similar to utility power. This results in an inverter that is more stable and
efficient. Only pure sine wave inverters can power sensitive appliances that require a
high-quality waveform with little harmonic distortion, such as refrigerators, washing
machines, microwave ovens, air conditioners, mercury lamps, sodium lamps, and
electric drills.
①On/Off Switch
②LED (GREEN): When this green LED is illuminated, the inverter is operating.
③LED (RED): When the red LED is illuminated, the inverter has shut down, due to
overheating, overload, under voltage, or over voltage.
④LCD display
⑤Remote switch connection port: Insert a wired remote switch here (optional).
⑥USB power port: 5V/2.4A for charging tablets, smart phones, and other small
electronic devices.
⑦AC outlets:U.S sockets*4
⑧Fans
⑨Positive terminal
⑩Negative terminal
Inverter Key Features

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*Soft Start function: This inverter can increase output voltage
progressively when connecting to heavy loads with minimum
noise interruption.
* Remote control function (optional): Users can control this
inverter from a distance with a remote control.
* Excellent surge ratings for differing loads.
* ETL ROSH FCC REACH APPROVAL.
* Advanced LCD display and LED indicators.
* Pure sine wave technology delivers clean power to safely
operate sensitive electronic devices.
* Convenient mounting kits are available.
* Multiple protection features, including battery protection, AC overload,
over temperature, and short circuit protection.
* 5V/2.4A USB port for quickly charging small electronic devices.
Before Installation

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Please read the instructions, warnings, and caution statements in this manual prior to
installation.
Device Safety
1. Operating the inverter when it is seriously damaged could
be dangerous.
2. Contact customer service if the inverter appears faulty.
Do not disassemble or attempt to repair the device as this
will void the warranty.
3. Always disconnect AC/DC connections and make sure the
inverter power switch is in the OFF position before
performing any maintenance or circuit wiring.
4. Under no circumstances should the household AC power
output terminals be connected to the inverter's AC outlets.
This inverter is ONLY designed for a 12V battery bank.
5. Ensure the polarity of the battery connections is correct
when connecting the terminals. Incorrect polarity
connection may cause permanent damage to this inverter.
Personal Safety
1.Installation and wiring of this inverter must comply with NEC
codes and be completed by a certified electric technician.
2. Be cautious when touching bare terminals of capacitors.
They may retain high or lethal voltages, even after power
is disconnected.
3. Wear eye and clothing protection while connecting the
inverter to the battery bank. If battery acid contacts skin or
clothing, wash immediately with soap and water. If acid
enters the eye, immediately flood the eye with running cold
water for at least 10 minutes and seek medical attention.
4. Do not put flammable items near this inverter during
installation, check for dangerous gas fumes, and make

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sure all electrical connections are tight. The connection
process may cause sparks.
5. To avoid dangerous short circuits, avoid wearing metal
items during installation, such as rings, bracelets, necklaces,
or watches.
6. A frozen battery should never be operated with a charger
or inverter.
Battery Safety
1. Do NOT let the positive (+) and negative (-) terminals of
the battery touch each other.
2. Use only deep cycle, sealed lead-acid, flooded, or gel batteries.
3. Explosive battery gases may be released while charging.
Always charge batteries in a well-ventilated area.
4. Overcharging can damage the battery plates. Charging
continuously at a high setting can cause the battery to be
damaged, faulty, and/or ineffective. Prior to charging the
device, please review the battery manufacturer’s
requirements and follow the instructions carefully.

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Installation
Always make sure the inverter is switched o- before connecting to other devices.
Follow the important guidelines below to determine the installation location.
* Well-ventilated, cool, dry area. The inverter must be located in an area where the
fan is not blocked or exposed to direct sunlight. It should be placed in an area that
is free of any moisture, with a minimum of 10 inches of clearance on all sides to
provide adequate ventilation.
* Away from re hazard: Flammable items, liquids, or combustible materials should not
be placed near this inverter, due to potential sparks the unit could produce.
* Away from children: Keep this unit away from children, due to potential fire and
electrical hazards.
* Close to battery bank: Placing the inverter close to the battery can prevent excessive
voltage drop. However, do not install the unit above or below a battery bank.
Mount and secure the inverter: This inverter can be mounted
with brackets (optional). Refer to the mounting section below
for details.
Mounting the Inverter
1. Turn o- the inverter.
2. Determine the appropriate mounting position. Attach the
mounting brackets on both sides of the inverter with
3x5mm screws (three on each side). Note: Screws longer
than 5mm will not fit.
3. Place the inverter in the desired position and mark the
location of the four mounting fasteners.
4. Drill holes for the four mounting fasteners.
5. Mount the inverter with four 6x35mm screws.
Mounting Diagram

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Warning: Vertically mounting the inverter is not recommended; it would affect the
efficiency of fans.
Sizing Off-Grid Solar Batteries:

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Calculating How Many Amp-Hours You Need
Step 1: Determine inverter size
First calculate the peak load or maximum wattage of your applications by
adding up the wattage of the appliances and devices that could run at the
same time. For example, a room with two 60-watt light bulbs and a 300-
watt desktop computer will need an inverter size up to 420 watts (60 times
two, plus 300).
Step 2: Figure out energy used in a day
Figure out how long each electronic device will run during the day, in hours.
Multiply the wattage of each device by its running time to get the energy
in watt-hours per day. For example, a microwave oven is 750 watts. Divide
this by 12VDC to calculate amps: 750 watts/12volts=62.5 amps. If the
microwave will be run for four hours, then you will need at least a 250Ah
battery (62.5 amps times four hours).
Battery Connecting Methods

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Figure 1. This wiring setup shows
an inverter connected directly to a
vehicle engine battery for light load
devices.
Figure 2. This wiring setup shows
a battery connection for medium load
devices. This setup only allows the
inverter to draw power from the auxiliary
battery, not the vehicle starting battery.
To maximize battery capacity, you may need to connect several batteries. Two
identical batteries can be connected with positive-to-positive (+ to +) and