5
•Do not insert foreign objects into the inverter’s AC outlets or USB charging port.
WARNING: TO REDUCE THE RISK OF FIRE:
•Make sure that the 12 volt outlet is free of debris and the inverter fits tightly in the outlet. 
•Do not replace any vehicle fuse with one of a rating higher than recommended by the vehicle manufacturer. This product is 
rated to draw 10 amperes from a 12 volt vehicle accessory outlet. Ensure that the electrical system in your vehicle can supply this 
without causing the vehicle fuse to open. This can be determined by making sure the fuse in the vehicle that protects the outlet 
is rated higher than 10 amperes. Information about the vehicle fuse ratings are typically found in the vehicle operator’s manual.
•If the vehicle fuse opens repeatedly, do not continue to replace it. Discontinue use of the vehicle accessory outlet and locate 
the source of the overload. NEVER patch the fuse with tin foil, wire, or the like, as this may cause serious damage elsewhere in 
the electrical circuit or cause a fire.
•Do not operate near flammable materials, fumes or gases.
•DO NOT expose to extreme heat or flames. 
CAUTION: TO REDUCE THE RISK OF INJURY OR PROPERTY DAMAGE: 
•Remove appliance plug from outlet before working on the appliance.
•DO NOT attempt to connect or set up the unit or its components while operating your vehicle. Not paying attention to the 
road may result in a serious accident.
•Always use the inverter where there is adequate ventilation. Do not block ventilation slots.
•ALWAYS turn the inverter off by pressing the translucent on/off button, then disconnecting it from the DC source when not 
in use.
•Make sure the nominal powering voltage is 12 volts DC, center connection positive (+).
•When using this unit in a vehicle, check the vehicle owner’s manual for maximum power rating and recommended output.  
Do not install in engine compartment — install in a well ventilated area.
•Do not use with positive ground electrical systems.* Reverse polarity connection will result in a blown fuse and may cause 
permanent damage to the inverter and will void warranty.
  *The majority of modern automobiles, RVs and trucks are negative ground. 
•Keep in mind that this inverter will not operate high wattage appliances or equipment that produces heat, such as coffee 
makers, hair dryers, microwave ovens and toasters.
•Do not open the inverter — there are no user-serviceable parts inside.
•Do not use this inverter with medical devices. It is not tested for medical applications.
•Keep away from children.This is not a toy!
•Install and operate unit only as described in this Instruction Manual.
•Do not use this inverter on a watercraft. It is not qualified for marine applications.
•Check unit periodically for wear and tear. Do not disassemble the unit; return it to the manufacturer when service or repair is 
required. Opening the unit may result in a risk of electric shock or fire, and will void warranty.
•Read And Understand This Instruction Manual Before Using This Unit.
SAVE THESE INSTRUCTIONS
WARNING: TO REDUCE THE RISK OF INJURY OR PROPERTY DAMAGE: 
Follow these instructions and those published by 
battery manufacturer and the manufacturer of any equipment you intend to use with this unit. Review cautionary markings on 
these products and on engine.
INTRODUCTION
Congratulations on purchasing your new 
Stanley
®
 800 Watt Power Inverter
.
 Read this Instruction Manual and follow the 
instructions carefully before using your new inverter.
This power inverter is configured to supply continuous power in the form of two 120 volt AC outlets and a 5 volt USB charging 
port to run most household or electronic appliances. 
HOW THIS INVERTER WORKS
This inverter is an electronic device that converts low voltage DC (direct current) electricity from a battery to 120 volts AC 
(alternating current) household power. It converts power in two stages. The first stage is a DC-to-DC conversion process that 
raises the low voltage DC at the inverter input to 145 volts DC. The second stage is a MOSFET bridge stage that converts the 
high voltage DC into 120 volts, 60 Hz AC.
Power Inverter Output Waveform
The AC output waveform of this inverter is known as a modified sine wave. It is a stepped waveform that has characteristics 
similar to the sine wave shape of utility power. This type of waveform is suitable for most AC loads, including linear and 
switching power supplies used in electronic equipment, transformers, and small motors.
The modified sine wave produced by this inverter has an RMS (root mean square) voltage of 120 volts. Most AC voltmeters 
(both digital and analog) are sensitive to the average value of the waveform rather than the RMS value. They are calibrated for 
RMS voltage under the assumption that the waveform measured will be a pure sine wave. These meters will not correctly read 
the RMS voltage of a modified sine wave. Non-TRUE RMS meters will read about 20 to 30 volts low when measuring the output 
4
SAFETY GUIDELINES / DEFINITIONS
DANGER:
 Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING:
 Indicates a potentially hazardous situation which, if not  avoided, could result in death or serious injury.
CAUTION: 
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
CAUTION:
 Used without the safety alert symbol indicates potentially hazardous situation which, if not avoided, may result in 
property damage.
RISK OF UNSAFE OPERATION.
 When using tools or equipment, basic safety precautions should always be followed to reduce 
the risk of personal injury. Improper operation, maintenance or modification of tools or equipment could result in serious injury 
and property damage. There are certain applications for which tools and equipment are designed. The manufacturer strongly 
recommends that this product NOT be modified and/or used for any application other than for which it was designed. Read 
and understand all warnings and operating instructions before using any tool or equipment.
IMPORTANT SAFETY INSTRUCTIONS
WARNING: 
This product or its power cord contains lead, a chemical known to the State of California to cause cancer and 
birth defect or other reproductive harm. Wash hands after handling.
GENERAL SAFETY WARNINGS AND INSTRUCTIONS FOR ALL POWER INVERTERS
READ ALL INSTRUCTIONS
WARNING:
 Read all instructions before operating product. Failure to follow all instructions listed below may result in electric 
shock, fire and/or serious injury.
•
Avoid dangerous environments.
 Don’t use appliances in damp or wet locations. Don’t use appliances in the rain.
•
Store idle appliances indoors. 
When not in use, appliances should be stored indoors in dry, and high or locked-up place – out 
of reach of children.
•
Don’t force appliance.
 It will do the job better and with less likelihood of a risk of injury at the rate for which it was 
designed.
•
Use right appliance. 
Do not use the appliance for any job except that for which it is intended.
•
Disconnect appliances. 
Disconnect the appliance from the power supply when not in use, before servicing, and when 
changing accessories such as blades and the like.
•
Proper cooling is essential when operating the inverter. 
Do not place the unit near the vehicle’s heat vent or in direct 
sunlight.
•
Use of accessories and attachments. 
The use of any accessory or attachment not recommended for use with this appliance 
could be hazardous. Note: refer to the accessory section of this manual for further details.
•
Check damaged parts. 
A part that is damaged should be properly repaired or replaced by manufacturer.
•
Outdoor use extension cords.
 When an appliance plugged into this unit is used outdoors, use only extension cords intended 
for use outdoors and so marked. NOTE THAT THIS INVERTER IS NOT INTENDED TO BE USED OUTDOORS.
•
Extension cords. 
Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy 
enough to carry the current your product will draw. An undersized cord will cause a drop in line voltage resulting in loss of 
power and overheating. The following table shows the correct size to use depending on cord length and nameplate ampere 
rating. If in doubt, use the next heavier gauge. The smaller the gauge number, the heavier the cord.
Minimum Gauge for Cord Sets
Volts   Total Length of Cord in Feet (Meters)
120V 0-25  26-50  51-120  101-150
  (0-7.6m) (7.6-15.2m)  (15.2-30.4m)  (30.4-45.7m)
240V  0-50   51-120  101-200  201-300
  (0-15.2m) (15.2-30.4m)  (30.4-60.9m)  (60.9-91.4m)
Ampere Rating
More  Not more    American Wire Gauge
Than Than 
 0 -   6  18  16  16  14
  6 -  10  18  16  14  12 
10 -  12  16  16  14  12
12 -  16  14  12  Not Recommended
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK:
•Do not connect to AC distribution wiring.
•Do not make any electrical connections or disconnections in areas designated as 
IGNITION PROTECTED.
 This includes DC 
cigarette lighter type plug connection or airplane adapter. This unit is NOT approved for ignition protected areas.
•
NEVER 
immerse the unit in water or any other liquid, or use when wet.
PI800PS_ManualENSP_051116.indd   4-5 5/11/2016   11:17:56 AM