DieHard 28.71495 Operator's Manual page 7

To calculate the wattage: Wattage = AMPS x 120 (AC Voltage).
To calculate the starting load: Starting Load = 2 x wattage.
In general, the startup load of the device or power tool determines whether
your inverter has the capability to power it.
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.
When using the vehicle's 12 volt accessory port, this inverter is designed
to supply 60 to 70 watts when the vehicle is not running. With the vehicle's
engine running, it can supply up to 100 watts. To use the full 750 watt output,
you must connect the inverter directly to your battery.
NOTE: The 100 watt limit is to accommodate the fuse ratings for all vehicles.
Some vehicles may allow the full output. If the vehicle fuse blows when you
switch on the device you are trying to use, you have to either use a smaller
device or you must connect the inverter directly to the battery.
IMPORTANT: This inverter uses a modified sine waveform (diagram A) which
is not quite the same as power company electricity (diagram B). For the
following devices, we strongly recommend that you use caution and check the
device's manual to make sure it is compatible with modified sine waveform.
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. Transformer less battery chargers
Using the inverter with any of these devices may cause the device to run
warmer or overheat.
Diagram A
Modified sine waveform
produced by inverter
Diagram B
Pure sine waveform
typical of home AC outlet
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