Cobra
PURE SINE 400W

Pure Sine 400 Watt Power Inverter

$129.95

The PURE SINE 400W Power Inverter with Fast Charge USB is perfect for pro drivers, travelers, campers, and more who want to power medical devices like CPAP machines or sensitive electronics like laptops, gaming systems, and entertainment devices.

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Cobra PURE SINE 400W

Pure Sine 400 Watt Power Inverter

$129.95
List price $129.95
Click Here For Bulk Business Pricing
Cobra PURE SINE 400W
List price $129.95
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Discounts for Military, First Responders, Teachers and Students through
ID.me military, first responder, teacer and student discountsSee Terms

Discounts for Military, First Responders, Teachers and Students throughID.me military, first responder, teacer and student discountsSee Terms

Remote On/Off Controller Bundle

$189.90

Power where you need it. When used with Cobra PRO, PURE SINE, or POWER inverters, the Remote Controller enables on/off control from anywhere inside your vehicle along with fast charging of your smartphone or other devices. 

View On/Off and Operating Status on all Cobra inverters 1500W and higher (On/Off Status for other models). Includes remote controller with USB-A and USB-C fast charge ports, RJ-45 cable, and mounting kit.

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Find a better advertised price online for any current Cobra product and we’ll match it within 30 days of purchase.

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Enjoy free standard shipping on all orders of $80 and up. Select Free Ground Shipping over $80 at checkout.

Simple Returns

Not satisfied? No questions asked. All products purchased factory direct come with a 30-day money back guarantee.

PURE SINE 400W POWER INVERTER

With 400 Watts of Pure Sine Wave power, you'll be able to run medical equipment and sensitive electronics without any operating issues.

1Ideal for Medical Equipment & Sensitive Electronics

Pure Sine Wave output provides a clean electrical current to ensure your medical devices and electronics operate properly.

290% Efficient Pure Sine Wave

Highly efficient inverter, giving your devices and appliances longer run times and extending your vehicle’s battery life.

3400 Watts Continuous / 800 Watts Peak

400 Watts of continuous Pure Sine power with 800 Watts peak can reliably handle your medical devices and electronics.

42 GFCI Protected AC Outlets

Easily power up to 2 of your medical devices, electronics, or small appliances with GFCI protected AC outlets for each.

515W USB Fast Charge Ports

Quickly charge your smartphones, tablets, or other mobile devices from the convenient USB-A and USB-C ports.

6Pentagon Protection Safety

Built-in protection for Over Temperature, Reverse Polarity, Over Voltage, Low Voltage Alarm, and Low Voltage Cutoff.

ADDITIONAL FEATURES

2 Year Warranty

Industry-leading 2 year warranty provides complete peace of mind

COBRA REMOTE COMPATIBLE

Monitor and charge devices with Fast Charge USB from anywhere inside your vehicle

16" #12 AWG and 12V Cables Included

Includes heavy-duty direct-to-battery cable and convenient 12V accessory cable

Input/Output LED Indicator

A 2-color LED indicator lets you know your power inverter status at all times

INDUSTRY-LEADING SAFETY

When you need safe and reliable portable power,nothing comes close to a Cobra

Rugged Industrial Design

Designed to look and work great in your car, truck, RV, or semi

Cobra power inverters product lineup

POWER YOU CAN TRUST

With a range of 400 to 3000 Watts, our family of reliable and dependable power inverters provides the power you need, whether it’s to work, play, or get away.

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POWER WHERE YOU NEED IT

Our POWER 500W power inverter is small enough to fit just about anywhere but capable enough to charge and power your devices and small appliances.

PRO DRIVERS CAN COUNT ON COBRA

Our PRO 1500W, 2500W, and 3000W inverters provide all the power you might need to charge or operate devices, electronics, and standard appliances.

POWER TO GET THE JOB DONE

With our PRO series of power inverters, you’ll get the job done with 4 GFCI protected AC outlets and Cobra’s industry-leading Pentagon Protection built-in safety.

HAVE MORE FUN OUTDOORS

Whether you’re camping, tailgating, or on a road trip, you’ll have more fun outdoors knowing you can power the devices and appliances you need to entertain.

COMPARE MODELS

PURE SINE 400W

PURE SINE 400W

POWER 500W

POWER 500W

PRO 1500W

PRO 1500W

PRO 2500W

PRO 2500W

PRO 3000W

PRO 3000W

Output Waveform Pure Sine Modified Sine Modified Sine Modified Sine Modified Sine
Continuous/Peak Power 400W / 800W 500W / 1000W 1500W / 3000W 2500W / 5000W 3000W / 6000W
Perfect For Pro Drivers
Campers
RV Enthusiasts
Travelers
Campers
RV Enthusiasts
Pro Drivers
Campers
RV Enthusiasts
Pro Drivers
Contractors
Campers
RV Enthusiasts
Pro Drivers
Contractors
Campers
RV Enthusiasts
Can Power Medical Devices
Sensitive Electronics
Smartphones/Laptops
Entertainment Devices
Smartphones/Laptops
Entertainment Devices
Small Appliances
Smartphones/Laptops
Electronics
Entertainment Devices
Kitchen Appliances
Smartphones/Laptops
Electronics
Entertainment Devices
Power Tools
Kitchen/Bath Appliances
Smartphones/Laptops
Electronics
Entertainment Devices
Power Tools
Kitchen/Bath Appliances
GFCI Protected AC Outlets 2 2 4 4 4
Volt/Watt Meter 2-Color LED 2-Color LED 7-Segment LED Display 7-Segment LED Display 7-Segment LED Display
Included Cables 16' #12 AWG and 12V Cables 16' #10 AWG and 12V Cables (2) 48" #4 AWG Cables (4) 48" #4 AWG Cables (4) 48" #2 AWG Cables
Cooling Fans 1 1 2 2 2
Cobra Remote Controller with Fast Charge USB Compatible Compatible Compatible Compatible Included
3.0 Amp USB Fast Charge Ports USB-A / USB-C USB-A / USB-C USB-A / USB-C USB-A / USB-C USB-A / USB-C
Efficiency Rating 90% 90% 90% 90% 90%
Pentagon Protection Safety
2 Year Warranty
cETL Certified
Terminal Protector Boots
Mounting Kit for Remote Controller

POWER WHERE & WHEN YOU NEED IT

Cobra's family of power solutions are the safe, reliable way to provide you with power, wherever and whenever you need it. With advanced technology and built-in safety protection, you can always count on Cobra for your power needs.

WHAT'S IN THE BOX

Included with your PURE SINE 400W power inverter are 16" #12 AWG power cables and a 16" 12-Volt accessory cable.

Item # CPI400PSW

Continuous Power: 400W

Surge Power: 800W

Efficiency Rating: 90%

No-load draw: < .6A

Output Waveform: Pure Sine Wave*

* Some packages may mistakenly list the Output Type as “Modified Sine Wave”. This is incorrect and should be Pure Sine Wave.

Input Voltage Range: 10.5 - 15.0V DC

Output: 115V AC, 60Hz, 3.4A, 400W

Low Voltage Alarm: 10.5V DC

Low Voltage Cut-Off: 9.5V DC

AC Receptacles: 2 GFCI Protected AC Outputs

Fast Charge USB-A Output: 5V/3.0A, 9V/1.67A Fast Charge

Fast Charge USB-C Output: 5V/3.0A, 9V/1.67A Fast Charge

Remote-Ready Output Port: Yes

Remote Included*: No

*Sold Separately

12V Vehicle Accessory Cable: Yes

Includes Direct-to-Battery Cables: Yes

Direct-to-Battery Cables: 16" #12 AWG Cables

Thermal Shut-Down: Yes

Reverse Polarity Protection: Yes

Volt/Watt Meter: 2-Color LED

Warranty: 2 Year

Package Type: Gift Carton

Product Weight: 1.98 lbs

Product dimensions: 8.86" H x 5.39" W x 2.83"D

Package dimensions: 11.02" W x 9.06" H x 3.15" D

Master pack quantity: 6

Master pack dimensions: 10.24" H x 11.42" W x 18.90" D

Master pack weight: 16.04 lbs

UPC: 0 28377 31556 5

Master pack barcode: 2 00 28377 31556 9

The fan does not run

This is normal.  The fan will only run when needed, if the inverter starts to get hot.

The output voltage is low

The voltage from your inverter is a little different than the voltage in your home.  The voltage in your home is called a “sine wave”, while the voltage from the inverter is a “modified sine wave”.  Because of this difference, you will need a  meter that measures “true RMS” voltage.  If your meter does not measure “true RMS”, then it will read low.

If it does not say “true RMS” on the front of your meter, then it is not a true RMS meter and it will read low.

My outlet tester shows an open ground

Outlet testers are intended for testing normal utility power in your home.  With normal utility power, the neutral and ground are connected together in your fuse box.  Outlet testers are designed under this assumption.

The outlet on your power inverter, however, is not configured exactly the same as in your home.  It is normal for an outlet tester to show an open ground. This does not indicate a problem with your inverter.

Does it matter where I mount my inverter?

Your power inverter is not weatherproof, so it needs to be installed where it will be protected from heat and moisture.  Keep a minimum 1 inch clearance around the inverter for ventilation.

The inverter can be mounted in any position -- horizontal, vertical, or upside-down.

My inverter makes a squealing sound (alarm sound)

If the battery voltage gets too low, your inverter will sound a low-voltage alarm.  This can happen for any of the following reasons:

-The battery is low and needs to be charged

-A loose connection with the battery cables

-A loose connection in the cigarette socket (if you are using a cigarette power cord)

-The battery cables to the inverter are too small

-The appliance is pulling excessive power from the battery

If you get low voltage alarm then try running the engine so that the alternator is supplying extra power.  If you get the alarm even with the alternator running, then check all the cable connections.  There might be a loose connection somewhere.

How much power can I draw from each AC outlet?

If your inverter has more than one AC outlet, the full inverter power is available from any of the outlets.

 

See more FAQs