Modified Sine Wave Power Inverter 12V DC to 230V AC MP57050

Modified Sine Wave Power Inverter 12V DC to 230V AC MP57050
22. Declaration
This product complies with the following :
89/336/EEC (EMC)
2006/95/EC (LVD)
2002/95/EC (RoHS)
BS1363 Part 2 1995
23. Contact
Email :
Web :
Maypole Ltd, Birmingham, UK
May 2012
Modified Sine Wave
Power Inverter
12V DC to 230V AC
MP57050 500 Watt
MP57030 300 Watt
1. Introduction
Thank you for purchasing our Power Inverter. It is a compact and highly portable
power inverter. is the leader in the field of high frequency inverter. From12V DC
outlet in your vehicle or boat, or directly from a dedicated 12V/24V DC battery, the
inverter will efficiently and reliably power a wide variety of household AC products,
such as TVs, computers VCRs, etc. The inverter is designed to provide years of
trouble-free operation and includes automatic safety monitoring circuit to protect the
inverter, connected devices and your battery from inadvertent overload conditions.
Read this guide before installing or using the inverter and save it for future reference.
Operating Instructions
This product was developed carefully and designed for permanent use.
Please read these instructions carefully and keep then for subsequent reference.
Please read the PRECAUTIONS section carefully to avoid any damage to the power
inverter or the other units that are used.
2. Safety First
Incorrect installation or misuse of the inverter may result in danger to the user or
hazardous conditions. We urge you to pay special attention to all CAUTION and
WARNING statements. CAUTION statements identify conditions or practices that
may result in damage to the inverter or to other equipment. WARNING statements
identify conditions that may result in personal injury or loss of life.
▲WARNING! Shock hazard, keep away from children.
·The inverter generates the same potentially lethal AC power as a normal household
wall outlet. Treat it as you use any other AC outlet.
·Do not insert foreign objects into the inverter’s AC outlet, fan or vent openings.
·Do not expose the inverter to water, rain, snow or spray.
·Do not, under any circumstance, connect the inverter to AC Power.
▲WARNING! Ventilation
·The inverters housing may become uncomfortably warm, reaching 140F (60℃)
under extended high power operation. Ensure at least 2 inches (5 cm) of air space is
maintained on all sides of the inverter for adequate cooling. During operation, keep
away from materials that may be affected by high temperature.
▲ WARNING! Explosion hazard.
·Do not use the inverter in the presence of flammable fumes or gases, such as in the
bilge of a petrol powered boat, or near propane tanks. Do not use the inverter in an
enclosure containing automotive-type, lead-acid batteries. These batteries, unlike
sealed batteries, vent explosive hydrogen gas which can be ignited by sparks from
electrical connection.
·When working on electrical equipment always ensure someone is nearby to help you
in an emergency.
19. Precautions
·Ensure that the incoming current does not exceed 15 Volt.
·Check that terminals on the battery connection leads are tight at regular intervals. Loose
connections can generate heat and/or damage the inverter or the power source.
·Improper use of the power inverter can cause injuries.
20. Technical Data
MP57030 300W MP57050 500W
MP57030 600W
Modified sine wave
MP57050 1000W
40A x 1
35A x 2
Shut off output voltage, re-power
on to recover
Auto Shut off
Fuse will break
With DC wire in the packing
The warranty will lapse in case the power inverter is used improperly.
Metal and electrical parts should not be disposed of in household waste
system. Information about proper disposal is available from your local council.
16. Malfunctions (Protective features of the power inverter)
Low battery voltage may damage the battery but not the power inverter as it switches
Once the normal operating voltage is reinstated, the unit can be operated again.
Overload protection - If the incoming voltage exceeds 15Volt DC, or if the permanent
output is exceeded, the unit switches off automatically.
Short-circuit-If the wires are crossed or the output has short-circuited, this usually
causes the 15 amp fuse to blow. Unplug the load from the power inverter and exchange
the fuse.
Overheating protection-If the internal temperature of 65℃ is exceeded, the unit
switches off automatically. After a cool-down phase of approx.15 minutes, the unit can
be switched on again.
17. General Problems
Some inductive motors may require several start-up attempts. If the device only runs for
a moment, switch the power inverter on and off quickly and repeat until the device runs.
Humming in music systems
The loudspeakers of some stereo systems may hum as they cannot filter the modified
sine waves that the power inverter generates.
Problems when operating a TV.
The power inverter is already screened, although there may be visible interference,
especially if the TV signal is weak. Try one of the following actions:
·Position the power inverter as far away as possible from the unit, the aerial and the
aerial cable.
·Look for the best possible position for the aerial cable, the power cable, the TV and the
power inverter, use good quality aerial cables.
Problem: Low outgoing voltage
Reduce the outgoing output.
The power inverter is overloaded
Ensure adequate incoming voltage of
Incoming voltage is below 10.6 Volt
over 10.6 volt
Note: Only use RMS voltmeters to measure the outgoing voltage.
Problem: battery power is too low
Poor condition of the battery
Replace the battery
Inadequate power supply or
inappropriate voltage drops
Problem: No output
The power inverter is not at operating
Switch the power inverter off and on again. If
necessary repeat the process until the
operated unit starts.
Cigarette lighter requires power.
Switch the ignition on.
Battery voltage below 10 Volt.
Power inverter has cut-off automatically
due to overheating.
Fuse has blown
Charge or exchange the battery.
Allow the power inverter to cool down.
Ensure there is enough air circulation
Exchange the fuse. Check that the wires are
Connected correctly when connecting the
power inverter
·Do not connect live AC power to the inverter’s AC outlets. The inverter will be
damaged even if it is switched OFF.
·Do not expose the inverter to temperatures exceeding 104F (40℃).
△CAUTION! Do not use the inverter with the following equipment:
·Small battery operated products such as rechargeable flashlights, some rechargeable
shavers and nightlights that are plugged directly into an AC receptacle to recharge.
·Certain battery chargers for battery packs used in hand powered tools. These
chargers will have warning labels stating that dangerous voltages are present at the
charger’s battery terminals.
△CAUTION! Check that the battery voltage (12 Volt) is the same as the input
voltage of power inverter (for example, DC 12V of battery connected with input
voltage 12V of the inverter)
·Don’t disassemble or modify the inverter by yourself.
3. Safety Features
·Input protection: Polarity reversal (Fuse)/Over and under voltage/Low battery Alarm
and shut Down
·Output protection: Short circuit-Overload-Over temperature
·Power ON/OFF SWITCH and LED indicator
·Full isolation of Input and output circuits
·Low power consumption (standby)
·LVD meets EN60950 and e8 mark
·EMC meets EN61000-6-3, EN55022
4. Installation Environment
For safe and optimum performance, install the inverter in a location that is dry
Do not expose to water or spray, do not use or store in a damp environment.
·Cooling - Operate only in ambient temperatures between 0℃ and 40℃. Keep away
from surface heating vents or other heat producing equipment.
·Location - Clean and free of dust and dirt. This is especially important if the inverter
is used in a working environment.
5. Operating Principle
The inverters work in two stages, during the first stage the DC to DC converter
increases the DC input voltage from the power source (eg.12 volt battery) to 300 DC
volts. In the Second stage, the high voltage DC is converted to the (AC) power
required using advanced power MOSFET transistors or IGBT technology in a full
bridge configuration. The result is excellent overload capability and the capacity to
operate difficult reactive loads.
power inverter.
6. Diagram 1.
(Note - This picture is for reference only)
7. Operating Instructions
(1) ON/OFF power switch
This switch turns ON/OFF the inverter
(2) Power indicator
When lit, it indicates the inverter has been turned on and is ready for use.
(3) Overload (Fault) indicator
If the LED overload on, indicates that the inverter in the state of warning or protection,
please stop to use it soon.
(4) AC outlets
Output AC power, Please see the following Photos, Different countries can select the
Right socket as following.
(5+ and 5-) 12Volt Battery connections posts
Please connect the inverter to the battery observing the correct polarity. Red terminal is
positive (5+) and black terminal is negative(5-)
(6) High speed cooling fan
The fans cool the internal circuits automatically, while the inverter is in working
(7) Connecting lead
For Connection of the inverter to batteries
8. Power Supply
The power supply source needs to guarantee at least 10.5 Volt to max.15.0 Volt DC and
enough permanent output to operate the unit.
The power supply source can be a battery or a similar DC power supply.
To establish the estimated necessary power supply (in amps) divide the respective output
(in Watt) of the operated unit by the incoming voltage. (12 Volt in the case of a car
9. Connection to the power supply
·Unpack the power inverter and ensure that the switch is at the OFF position.
Caution: Inverter may only be operated with 12 Volt batteries. It cannot be
operated at 6 Volts and at 24 Volts the inverter will be damaged!
Please observe the correct polarity when connecting the input leads and battery.
Connect the Red positive lead to terminal 5+ and the Black negative lead to terminal 5
Connect the Red and Black clips to the battery Positive and Negative terminals
10. Connecting the load
The load connected needs to lie within the specifications of the power inverter (500W).
Insert the plug into the socket of the power inverter.
Press the “On” switch-the green LED lights up, the unit is operational.
The LED will turn off if the voltage drops below 10V and the power inverter switches
off-switch off the consumer and disconnect the plug.
11. Rechargeable units
Caution: Some rechargeable units can be directly connected to standard sockets. These
units can damage the power inverter.
When a rechargeable unit is used for the first time, observe the temperature for approx.
10 minutes, if it becomes relatively hot, the unit cannot be operated using the power
Rechargeable units can be easily operated using a separate charger or transformer.
The power inverter is fitted with an internal blade fuse. Defective fuses should be
exchanged with new fuses of the same rating. To access disconnect unit and remove
screws from the end covers of the inverter. Slide off the top cover to expose the circuit
board and fuses.
13.Position of the power
No liquid may be allowed to enter the unit.
The ambient temperature should lie between 10°and 27℃-do not place on or directly
adjacent to a heat source.
Do not expose to direct sunlight..
Do not place any objects on top.
Do not use close to inflammable materials or in a places where inflammable vapours or
smoke can occur.
14. Connection via the vehicle’s battery
It is recommended running the vehicle’s motor for approx.15 minutes every hour to
prevent the battery from discharging.
The power inverter can be operated when the motor is running or when the motor is at
a standstill.
It is possible that the power inverter may not work due to the voltage drop during the
starting process.
15. Alarm (low battery voltage)
The power inverter switches off automatically when the voltage drops below 10 Volt.
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