The MotoMaster 750 W Intelligent Power Inverter (model no. 011-1901-4) is an electronic device designed to convert low-voltage 12 V direct current (DC) from a battery source (such as those found in cars, motor homes, or boats) into conventional 115 V alternating current (AC) for powering standard household devices. This allows users to operate items like TVs, VCRs, portable stereos, and laptop computers in vehicles or other remote locations.
Function Description:
The power inverter serves as a mobile power outlet, enabling the use of AC-powered devices from a DC power source. It features multiple connection options, including a 12 V outlet plug for loads under 100 W and direct battery clamps for loads up to 750 W. Additionally, it includes a USB port for charging USB-powered devices. The inverter is equipped with a digital display that indicates available wattage and provides error codes in case of operational issues.
Important Technical Specifications:
AC Power:
- AC output voltage (nominal): 115 V, 60 Hz
- Maximum continuous AC output power: 750 W
- Peak power: 1500 W
- AC output frequency: 60 ± 1 Hz
- AC output waveform: Modified sine wave
DC Power:
- USB output: 5 V / 2.1 A max
- No load current draw (at 12 V input): < 0.4 A
- Efficiency (maximum): 85%
- Low-voltage alarm: 10.5 – 11.0 V
- Low-voltage shutdown: 10.0 – 11.0 V
- High-voltage shutdown: 15.0 – 16.3 V
Physical Specifications:
- Ambient operating temperature range: 0–40°C (32–104°F)
- Dimensions (L x W x H): 8 3/16 x 5 3/8 x 2 3/16" (20.9 x 13.7 x 5.7 cm)
- Weight: 2 lb 9 oz (1.16 kg)
Usage Features:
Connecting the Power Inverter:
The inverter can be connected to a 12 V DC power source in two ways:
- Via a 12 V outlet plug: For continuous loads under 100 W, the provided cable with a 12 V outlet plug can be inserted into the vehicle's 12 V outlet.
- Directly to a 12 V battery: For continuous loads between 100 W and 750 W, the provided cable with clamps is used to connect directly to the vehicle's 12 V battery. It is crucial to connect the RED cable to the POSITIVE port (+) and the BLACK cable to the NEGATIVE port (–) on the inverter, and then to the corresponding battery terminals. Incorrect polarity will damage the unit and void the warranty.
Operating Devices:
- Users must calculate the total wattage of AC devices to be connected to avoid overloading the inverter. The inverter has a continuous power rating of 750 W and a peak power rating of 1500 W.
- Devices should be switched on one by one after being plugged into the inverter's AC outlets or USB port.
- The digital display shows the available wattage. For example, if connected via the 12 V outlet plug, the 100 W quadrant illuminates, indicating a maximum load of 100 W. As the load increases, other quadrants may illuminate or turn off to indicate the remaining capacity.
- The USB port provides 5V/2.1A DC power for charging external USB-powered devices but does not support data communication.
Automatic Safety Features:
The inverter incorporates several safety mechanisms:
- Low-voltage alarm and shutdown: Activates when battery voltage drops to 10–11 V (alarm) and shuts down at 10.0–11.0 V to protect the battery from over-discharge.
- High-voltage shutdown: Activates if battery voltage rises to 15.0–16.3 V, protecting the inverter from defective charging systems.
- Overload protection: Automatically shuts down if a device rated more than 750 W is connected.
- Overheat protection: Activates with an alarm and shutdown if the inverter overheats due to improper ventilation or high ambient temperature.
- Output short-circuit protection: Activates in case of a short circuit in a connected device.
- Built-in fan: Activates when internal temperature increases significantly due to power usage.
- Replaceable fuse: An 8 A fuse (125 V) is used for protection against fire or electric shock.
Safety Guidelines:
- Avoid operating the inverter if it has been dropped or damaged.
- Ensure proper ventilation and avoid placing the inverter near heat sources or in direct sunlight.
- Do not insert foreign objects into outlets or ventilation openings.
- When connecting to a battery, remove all jewelry and wear protective eyewear and clothing. Ensure the battery compartment is well-ventilated to prevent explosions from flammable fumes.
- Do not start the car engine during inverter operation when connected to the battery.
- Always disconnect the power cables from the car battery when the device is not in use.
Maintenance Features:
Cleaning:
- Periodically clean the exterior with a damp cloth and mild soap solution.
- Ensure vents and fans are free of dust and debris.
- Never immerse the device in water or use corrosive detergents, wire brushes, or abrasive objects.
Battery Condition:
- Regularly operating the inverter from a vehicle's battery until the low-voltage alarm sounds will shorten the battery's life.
- The battery operating time depends on its charge level, capacity, and the power drawn by connected devices.
- For average loads of 750 W, it is recommended to start the vehicle regularly (e.g., every hour or two) to recharge the battery.
- If frequently running electrical products for extended periods, consider connecting the inverter to a separate deep-discharge type battery.
- The power inverter should be disconnected from the power source during battery charging.
Fuse Replacement:
- The inverter uses a replaceable 8 A fuse (125 V) located inside the 12 V outlet plug of the connector cable (J).
- To replace the fuse, twist off the upper cover of the 12 V outlet plug, remove the faulty fuse, insert a new one of the same type and rating, and twist the cover back on.
Troubleshooting:
The digital display (D) provides error codes for various issues:
- Low-battery alarm/shutdown: Indicates low battery voltage; recharge the battery.
- High-voltage shutdown: Indicates high battery voltage; verify the charging system and battery.
- Overload shutdown: Occurs when connected devices exceed the inverter's power rating; reduce the load.
- Overheating shutdown: Occurs when the inverter exceeds its safe operating temperature; turn off, allow to cool, clear ventilation, and move to a cooler place.
- No power to power inverter: Check battery, inverter damage, cabling connections, and fuse.
- Buzz in audio system: May be due to inadequate internal power supply filtering; use a high-quality filter.
- Television interference: Adjust inverter/television orientation, antenna, and cable; use shielded antenna cable.
Warranty:
The MotoMaster product carries a one (1) year warranty against defects in workmanship and materials. Defective parts will be repaired or replaced free of charge within the warranty period, provided the original purchaser returns the product with proof of purchase. The warranty does not cover wear or breakage due to misuse or abuse.
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