This is a very good 2kva 12v pure sine wave inverter, It has important advantages over high frequency inverters, such as peak power handling capacity and reliability. This low-frequency inverter can operate at the peak power level substantially higher than the nominal power, for a period of several seconds – which is great for starting appliances with high initial power draw (e.g. electric motors). The inverter also operates using a powerful transformer (as opposed to electronic switching components in high frequency inverters) - this results in a stronger, sturdier inverter which is less prone to damage. 

In addition to the standard function of inverting the power (i.e. converting the battery DC electricity into mains AC 230V 50Hz electricity), this inverter has other useful features and components: 

- It has a mains AC input which can take power from the national grid or a generator. The inverter is also equipped with a powerful built-in mains charger for charging the batteries (suitable for lead- acid battery types only), with programmable operating charging current; - When the mains AC input power is connected the inverter will activate the power transfer switch to work in a “bypass” mode, where the AC input mains power will be directly connected to the AC output, therefore “bypassing” the battery-to-output inverter circuit. The active mains input will also switch on the in-built battery charger unless the charger is set to OFF. 

- The inverter can work as an uninterrupted power supply (UPS) unit. By default, when the mains AC power input is connected and active, it will be connected to the mains AC output through the bypass transfer switch, powering the appliances directly. If suddenly there is a power cut or mains AC input is not available for any other reason, the inverter will automatically connect the batteries and start running the mains AC output from the batteries – without any interruption to the appliances.