Schumacher Power Inverter PI-140 - Manual (Page 4)

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To calculate the wattage: Wattage = AMPS x 120 (AC Voltage).
To calculate the starting load: Starting Load = 2 x WATTS. In general, the start
up load of the device or power tool determines whether your inverter has the
capability to power it.
To calculate the continuous load: Continuous Load = AMPS x 120 (AC Voltage).
Always run a test to establish whether the inverter will operate a
particular piece of equipment or device. In the event of a power overload, the
inverter is designed to automatically shut down. This safety feature prevents
damaging the inverter while testing devices and equipment within the wattage
range of the inverter.
If a device does not operate properly when first connected to the inverter, turn the
inverter ON (I), OFF (O), and ON (I) again in quick succession. If this procedure is
not successful, it is likely that the inverter does not have the required capacity to
operate the device in question.
This inverter is designed to power 100 watt devices or less when
used with the vehicle 12 volt accessory port. To use the full output you must use
the battery clips adapter and connect the inverter directly to the battery.
NOTE: The 100 watt limit is to accommodate the fuse ratings for all vehicles.
Some vehicles may allow the full output. If the fuse blows when you switch on the
device you are trying to use, you have to either use a smaller device or you must
purchase the 12 volt accessory outlet to battery clips adapter (Schumacher Model
SAC-103) and connect the inverter directly to the battery.
This inverter uses a nonsinusoidal waveform. Therefore, we do
not recommend you use it to power the following devices:
1. Switch mode power supplies
2. Linear power supplies
3. Class 2 transformers
4. Line filter capacitors
5. Shaded pole motors
6. Fan motors
7. Microwave ovens
8. Fluorescent and high intensity lamps (with a ballast)
9. Transformerless battery chargers
Doing so may cause the device to run warmer or overheat.