An inverter takes the DC input and runs it into a pair (or more) of power switching transistors. By rapidly turning these transistors on and off, and feeding opposite sides of a transformer, it makes the transformer think it is getting AC. The transformer changes this"alternating DC" into AC at the output. Depending on the quality and complexity of the inverter, it may put out a square wave, a"quasi-sine" wave, or a true sine wave.
Nearly all inverters we supply have 3-stage chargers, so you can usually leave them powered up all the time. All inverters with chargers also have a built in transfer relay - what that means is that if you are running from AC or shore power, the power feeds through the inverter, with some being tapped off for the battery charger. If the AC power goes out, the inverter automatically switches to battery power. In most cases you won't even see a light flicker, it is so fast.
Selecting the right inverter
When selecting an inverter, choose a size that can power the appliances you plan to use. Typical sizes installed in RV and home are 1000 to 2500 watts. Larger inverters from 4 kW to 11 kW are used in large power systems, such as lodges, and industrial applications.
Inverters used for Homes
Most home power systems in Tanzania are wired for 220-240 VAC, and an inverter is installed to feed these circuits. An inverter not only lets you use standard appliances and tools but conventional wiring as well. In larger remote residences, particularly those using auxiliary generators, inverters can reduce the costs of power generation by up to 90%. Most inverters include a stand-by battery charger, so that when the generator is on, the batteries are automatically recharged. Once the generator is turned off, the inverter system powers the same AC circuits. Not only do you have quiet power available 24 hours a day, but in most cases the fuel savings alone can pay for the complete cost of the inverter system in less than a year!