Cummins

Cummins 400 Watt Car Power Inverter DC 12V to 110V AC Converter Full Kit CMN400

Name: Cummins 400 Watt Car Power Inverter DC 12V to 110V AC Converter Full Kit CMN400
Brand: Cummins
SKU: CMN400
Price: 68.99 USD
Availability: InStock

$68.99 USD

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Genuine Cummins power, sold by an authorized Cummins retailer. The Cummins CMN400 is a 400 W 12 V DC-to-115 V AC power inverter for trucks, RVs, work vans, boats and job sites. Order by 2 PM PT for same-day shipping to all 50 states. Questions? Call 916-235-0009 or email speedstuff2017@gmail.com.

Why you'll like it

400 W (battery clamps); about 120 W through a 12 V socket plug (10 A socket) continuous, with 800 W (battery clamps) surge for start-up loads
AC outlets: 2
Charge phones and tablets without using an AC outlet (1 x USB-A 2.4 A, 1 x USB-C 3.0 A / 18 W)
Backlit power switch, cooling fan

Cummins CMN400 specifications

Brand	Cummins
Model / MPN	CMN400
Continuous power	400 W (battery clamps); about 120 W through a 12 V socket plug (10 A socket)
Surge (peak) power	800 W (battery clamps)
Input voltage	11–15 V DC
Output	115 V AC
Waveform	Modified sine wave
Efficiency	Up to 85%
Low-battery shutdown	10.5 V
AC outlets	2
USB ports	1 x USB-A 2.4 A, 1 x USB-C 3.0 A / 18 W
Connection	12 V plug plus 36 in. cables with battery clamps and ground cable
Controls	Backlit power switch, cooling fan
Weight	Approx. 2.99 lb
Dimensions	Not published by the manufacturer (omitted)

Specs come from the manufacturer's manual and official listings. Anything the manufacturer doesn't publish is marked "omitted" instead of being guessed.

What's in the box

Cummins CMN400 inverter
12 V accessory plug cord
36 in. positive/negative cables with battery clamps
Ground cable
Owner's manual

Which size inverter do I need?

Add up the running watts of everything you will use at the same time, then leave about 20% headroom. Motors and compressors (fridges, saws, pumps) can pull 2–3 times their running watts for a moment when they start. The CMN400 is a good fit for laptops, TVs, game consoles, small fridges and slow cookers. Above about 120–180 W you need the battery cables, not the 12 V socket.

Appliance	Typical running watts	Fits the CMN400?
Phone / tablet charger	10–20 W	Yes
Laptop	60–90 W	Yes
CPAP (no humidifier)	30–60 W	Yes
LED TV 32–50 in.	50–120 W	Yes
Electric blanket	100–200 W	Yes
12 V-replacement mini fridge	60–150 W	Yes
Slow cooker	150–300 W	Yes
Full-size refrigerator (start-up)	150–1200 W	Maybe, check your appliance label
Coffee maker (drip)	600–1000 W	No, choose a larger size
Microwave (700 W cooking)	1100–1200 W	No, choose a larger size
Circular saw (start-up)	1400–2500 W	No, choose a larger size
Hair dryer	1200–1875 W	No, choose a larger size
Space heater	750–1500 W	No, choose a larger size
Toaster oven	1200–1500 W	No, choose a larger size

These are typical figures. Always check the wattage label on your own appliance.

Modified sine wave vs. pure sine wave: the honest version

The CMN400 puts out a modified sine wave. Modified sine wave runs most chargers, laptops, phones, TVs, lights, power tools, heaters and coffee makers just fine, and it costs far less than pure sine wave. Some devices do better on pure sine wave: certain CPAP heated humidifiers, variable-speed tools, some battery chargers for cordless tools, audio gear (which may hum), medical equipment, and anything with a sensitive motor or a timer clock. GFCI outlets and devices may not work properly on modified sine wave either. If your equipment's manual calls for pure sine wave, buy a pure sine wave inverter.

Manual & Downloads

Cummins CMN400 Owner's Manual (PDF)

FAQ

Will the CMN400 run a microwave?

No. A microwave draws about 1,100 W or more, so you need a 1500 W or larger inverter connected directly to the battery.

Can I plug it into my cigarette lighter / 12 V socket?

Yes. Vehicle sockets are usually fused at 10–15 A (about 120–180 W), so heavier loads need the battery cables.

How long will my battery last?

Roughly divide your load watts by 10 to get the 12 V amps drawn. For example, a 500 W load draws about 50 A, so a 100 Ah battery gives about 1–1.5 hours of usable runtime. Run the engine for long or heavy use.