Modified sine wave

Modified sine wave has been created to save cost. Modified sine wave inverters and UPS systems just switch their DC supply between positive and negative poles to give you a simulated sine wave form.

Modified sine wave inverters and UPS systems are very cheap to produce but could be very costly if installed onto the incorrect equipment, for example, motors, fluorescent globes with standard ballasts, anything with a high inrush, speed control motors or anything that has sensitive information stored on it, or is of a sensitive nature itself. These should not be installed onto a modified sine wave inverter/UPS.

Please note that some UPS systems most notably the 600VA, under-the-desk type UPS systems are modified sine wave, but because a PC only runs off the inverter for a short period, when there is a power failure, they are less likely to be damaged as a result from the modified wave form.