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Black and red rectangular inverter with LCD screen, AC outlet, dual USB ports, cooling fan and battery clamps

chaomin

chaomin CMZ-4000 300W 4000W 12V 220V modified sine wave inverter

SKU CH-06GA-66FN3 MPN CMZ-4000

Converts 12 V battery power to 110 V or 220 V AC with 300 W continuous and 4000 W peak output, dual USB ports up to 4.2 A, and an LCD status screen

  • Key features- 8 Safety Protection Function: ?Reverse polarity protection
  • Overall height2.2 in (5.59 cm)
  • Overall width4.4 in (11.2 cm)
  • Overall length7.87 in (20 cm)
  • Product weight1.44 lb (0.65 kg)
  • 300W continuous power runs laptops and small appliances
  • 4000W peak handles brief start-up surges
  • Smart LCD shows input voltage, output voltage, battery level and load in real time
  • Dual USB ports deliver up to 4.2A total for fast phone and tablet charging
  • Eight protection circuits guard against reverse polarity, over-voltage, under-voltage, overload, over-current, short circuit.

Continuous and peak power

The chaomin CMZ-4000 is a modified sine wave inverter that converts 12 V vehicle power into 110 V or 220 V AC. It delivers 300 W of continuous output and can handle momentary peaks up to 4000 W. An LCD screen shows input voltage, output voltage, battery capacity and load in real time.

Devices under 300 W versus heavier loads

The inverter suits phones, tablets, laptops, LED lamps, shavers, breast pumps and similar electronics that stay within the 300 W rating. It cannot run kettles, microwave ovens, power tools or other appliances that draw more than the continuous rating, and the modified sine waveform may cause issues with sensitive medical or audio equipment.

Modified sine wave output waveform

The unit produces a modified sine wave rather than a pure sine wave, which limits compatibility with certain inductive or precision loads. Buyers should verify that their intended devices accept this waveform before purchasing.

How it compares

Measured against everything we stock in Diagnostic Tools & RV Electronics, at today’s prices. Recalculated every night.

Price $40.99
Pricier than about 74% of the 432 comparable items (median $18.99).

Specifications

Product
Brand nameChaomin
Model nameCMZ-4000
Size & build
Overall height2.2 in (5.59 cm)
Overall width4.4 in (11.2 cm)
Overall length7.87 in (20 cm)
Product weight1.44 lb (0.65 kg)

Questions about this item

Should I choose the 300W rated or the 4000W peak version of the CMZ-4000?

The CMZ-4000 is a single unit with 300W continuous rated power and 4000W peak power for brief surges; choose it if your loads stay under 300W steady.

What does the 300W rated power mean when I plug in a laptop and a lamp?

You can run a 50–100W laptop plus a 20W LED lamp together continuously, but the total steady draw must stay below 300W or the overload protection will trip.

The inverter has a 12V DC input — what voltage range does it actually accept?

It operates from 10.5V to 15V DC; below 10.5V low-voltage protection shuts it down, above 15V high-voltage protection activates.

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