Cummins
Cummins 4000 Watt Power Inverter Modified Sine Wave Truck Inverter 12V to 110 Volts Four AC Outlets Two USB Ports (Full Cable Kit Included) CMN4000W
Cummins 4000 Watt Power Inverter Modified Sine Wave Truck Inverter 12V to 110 Volts Four AC Outlets Two USB Ports (Full Cable Kit Included) CMN4000W
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Genuine Cummins power, sold by an authorized Cummins retailer. The Cummins CMN4000W is a 4000 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
- 4000 W continuous, with 8000 W surge for start-up loads
- AC outlets: 4 x standard North American (15 A each)
- Charge phones and tablets without using an AC outlet (1 x USB-A 2.4 A, 1 x USB-C 18 W)
- Detachable LCD with 12 ft extension cable; Bluetooth app; voice alarm
- Ready to wire up: 36 in. positive and negative cables included
Cummins CMN4000W specifications
| Brand | Cummins |
|---|---|
| Model / MPN | CMN4000W |
| Continuous power | 4000 W |
| Surge (peak) power | 8000 W |
| Input voltage | 11–15 V DC |
| Output | 115 V AC, 60 Hz |
| Waveform | Modified sine wave |
| Efficiency | Up to 90% |
| No-load current draw | < 0.6 A |
| Low-battery alarm / shutdown | 11.0 ± 0.3 V / 10.5 ± 0.3 V |
| Internal fuses | 18 x 30 A |
| Dimensions | 18.15 x 13.27 x 4.78 in. |
| Weight | 17.99 lb (unit) |
| AC outlets | 4 x standard North American (15 A each) |
| USB ports | 1 x USB-A 2.4 A, 1 x USB-C 18 W |
| Battery cables | 36 in. positive and negative cables included |
| Display / app | Detachable LCD with 12 ft extension cable; Bluetooth app; voice alarm |
| Cooling | Automatic cooling fans |
| Operating temperature | 32–104 °F |
| Warranty | 1-year limited warranty |
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 CMN4000W power inverter
- 36 in. positive and negative battery cables
- Detachable LCD remote display with 12 ft extension 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 CMN4000W is a good fit for a microwave plus a coffee maker, a fridge, power tools, or a full truck-cab setup. Expect a draw of roughly 1 amp of 12 V current for every 10 W of AC load, so a large battery bank and short, heavy cables are essential.
| Appliance | Typical running watts | Fits the CMN4000W? |
|---|---|---|
| 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 | Yes |
| Coffee maker (drip) | 600–1000 W | Yes |
| Microwave (700 W cooking) | 1100–1200 W | Yes |
| Circular saw (start-up) | 1400–2500 W | Yes |
| Hair dryer | 1200–1875 W | Yes |
| Space heater | 750–1500 W | Yes |
| Toaster oven | 1200–1500 W | Yes |
These are typical figures. Always check the wattage label on your own appliance.
Modified sine wave vs. pure sine wave: the honest version
The CMN4000W 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 CMN4000W Owner's Manual (PDF)
FAQ
Will the CMN4000W run a microwave?
Yes, a typical 700 W compact microwave pulls about 1,100–1,200 W from the wall.
Can I plug it into my cigarette lighter / 12 V socket?
No. It must be wired directly to the battery with the supplied cables. The manual recommends an ANL fuse near the positive terminal and keeping cables as short as possible.
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.
Is this a pure sine wave inverter?
No, it is modified sine wave. See the section above for what that means for your devices.
What warranty does it have?
1-year limited manufacturer warranty.
When will it ship?
Orders placed by 2 PM PT ship the same day, and we ship to all 50 states. Call 916-235-0009 with questions.
Compare other sizes
- Cummins CMN5000W, 5000 W
- Cummins CMN3000W, 3000 W
- Cummins CMN2000W, 2000 W
- Cummins CMN400, 400 W
- Cummins CMN120S, 120 W
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