Let me preface this by saying that any off grid system can produce power that is just as "clean" if not "cleaner" than what you get from the power company--IF you choose the right inverter. That's why I'm letting you know about this, so you don't make the mistake many others have made and end up having to repurchase equipment later on.
BACKGROUND FOR NEWBIES
First, a little background for those who are new to off grid systems. If you've never heard of an inverter before, it's a component in a renewable energy system that converts DC power (what is stored in batteries) into AC power (what you use in your home). Most quality inverters also have a charger built in. The charger is used when your battery bank may need to be manually charged with a fuel powered generator. There are two main types of inverters--sine wave and modified sine wave.
A quality sine wave inverter will produce power that is just as "clean" if not cleaner than what you get from the power company right now. Hands down, that is the first choice for any off grid system. Then there are modified sine wave inverters, which may produce a varying "quality" of power (i.e. better models may produce decent power, while the cheapest models put out awful electricity). For years, the only reason why someone would consider a modified sine wave inverter was because of price, which was roughly half the cost of a comparable sine wave inverter....