Inverters 12v dc to 240v ac

The AC output waveform of the 2500W INVERTER is called a "quasi-sine wave" or a "modified sine wave". (See Figure 2). It is a stepped waveform that is designed to have characteristics similar to the sine wave shape of utility power. A waveform of this type is suitable for most AC loads, including linear and switching power supplies used in electronic equipment, transformers, and motors. This waveform is much superior to the square wave produced by many other dc to ac inverters.

Figure 2. Modified Sine Wave

Certain rechargers for small nickel cadmium batteries can be damaged if connected to the 2500W INVERTER.
Two particular types of equipment are prone to this problem:
1) Small battery operated appliances such as flashlights, razors, and night lights that can be plugged directly into an ac receptacle to recharge.
2) Certain battery chargers for battery packs used in hand power tools. These chargers will have a warning label stating that dangerous voltages are present at the battery terminals.


This problem does not occur with the vast majority of battery operated equipment. Most of this equipment uses a separate charger or transformer that is plugged into the ac receptacle and produces a low voltage output. If the label on the ac adapter or charger states that adapter or charger produces a low voltage ac or dc output (less than 30 volts), 2500W will have no trouble powering this charger or adapter safely.

The modified sine wave produced by the 2500W INVERTER is designed to have an RMS (root mean square) voltage of 115 (or 225) volts, the same as standard household power. Most AC voltmeters (both digital and analogue), 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 read the RMS voltage of a modified sine wave correctly. They will read about 2 to 20 volts low when measuring the output of the 2500W INVERTER. For accurate measurement of the output voltage of the 2500W INVERTER, a true RMS reading voltmeter, such as a Fluke 87, Fluke 8060A, Beckman 4410, or Triplett 4200, must be used.