I need to buy a DC to AC power inverter. Which type should I buy?
The most efficient inverter is a square wave , not sine wave generator. The reason is that at any given moment, it's either almost perfectly conducting or insulating. Either way, hardly any power is wasted. Most of the time a sine wave generator is partly conducting, which means that some of the DC power going in is wasted as heat, like in a resistor. But square wave inverters have some drawbacks. Not all appliances like them. Draw up a list of which appliances you're going to use it with and ask their manufacturers if a square wave supply is OK. The other drawback to square wave power is that it contains the fundamental frequency and also high frequency harmonics, which cause radio interference. This can cause problems with nearby TVs, radios, cellphones and computers. You can do things to reduce this problem, but it's a complicated subject. My advice is, if the amount of power you need is fairly small, so a little bit of wastage is acceptable, use sine. If power is at a premium, like if you're using a car battery out in the bush, and you haven't got fussy neighbours or temperamental electronic gear around, use square.
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