The first item to consider while buying your inverter is the power that the inverter would provide. To do that you will have to look on the back of each items that wil run from the inverter and find the wattage draw. Once you have totalled up the wattage you need simply find an inverter which will provide about 50% more than you require. That help compensate for inductive surge requirement caused by pump motors and compressor motors. Now find out the size you need for the battery pack. If the inverter must produce 500 watts all the time then the battery must also provide 500 plus the wattage lost from the inverter conversion function. It means that you must check the rating of the inverter to find out the loss.
Types of inverter: Modified sine wave & Pure sine wave.
The difference between a modified wave and a pure sine wave is in the quality of the waveform as teh inverter creates AC power from DC. Advanced switching circuitry enables pure sine wave inverters to more accurately mimic the power you find in your household outlets.
Modified sine wave inverters are fine for most applications - particularly where the appliances has its own power adaptor, such as with chargers and laptop computer. Some types of audio quipment, like personal stereos or amplifiers, will create a 'buzz' when running on modified sine wave power. Some motorized euipment will also not perform properly on this type of power. A pure sine wave inverter will eliminate such operational isues and is also a good choice when the equipment being used is sensitive, such as with research or medical equipment.
What shoud i look for?
Check energy efficiency of the inverter, the charger quality, and battery life. Which should ideally be about 4-5 years. The energy efficieny, usually noted in the brochure, should ideally be about 85 %. This means that only about 15% of energy is lost when the inverter converts direct current from the battery to the alternating current used to power household appliances. Lower the energy loss, lesser the battery back-up needed. Charger quality is important because you need to constantly recharge the battery. An efficient charger saves electricity.
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