Inverter Converter

How can I convert 120 Volts DC into 120 Volts AC??? This is for a project I am working on. I need to run an small air compressor (120V - 15 amps). I know I could use a power inverter that converter 12V to 120V etc, but my friend said since I already have a 10 battery bank, I could build a 120DC to 120AC for a fraction of the cost of a big inverter. can someone tell me how to build one or give me and schematic? Thanks A VFD is a variable frequency drive. It uses electronics to rectify AC into DC, generate a frequency, then use output electronics to synthesize an AC waveform. With a battery bank, you need to do only the last part of this. I don't know if anyone makes just this module. AC motors are generally pretty forgiving of waveform, it doesn't need to be a perfect sine wave. They generally are made using a pulse width modulated output. 120VAC has 170V peak to peak. I expect your batteries need to be this, or half this, to work directly. Google to find circuits used for VFD's. You can leave yours at 60Hz, don't need to change speed, though this may not make much difference. PIC microprocessor site and others have example VFD circuits. Their application note nicely explain the PWM schemes and tradeoffs. Yours could be fairly simple. Some VFD's may also run on DC. Check their specs. A 3HP unit is about $300 USD, so probably not too much cheaper than the inverter. Why not start by checking pricing on a 2000 watt inverter powered by 12V or 24V? Should be able to find for about $200 new. Plus, if you get an inverter, it could be used to drive other loads if needed. Maybe you can get a used inverter to use or VFD to experiment with on ebay, if you are comfortable working with transistors. I would use 96V, use a MOSFET bridge to allow positive and negative going waveforms, then set up a controller and output transistor to PWM the output. It's actually a fairly complex project, and the time required may be big compared to the money saved. Maybe your friend can help... The voltages involved make it a little bit dangerous. Be safe, use caution.

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Buy Inverters

These days, it is impossible to spend even one moment without electricity. In modern times, there are number of appliances and other tools which are operated with power. Any power cut creates a total chaos. Inverter is the wonderful devices which provide electricity in those times of power cut. For various reasons, inverters are no longer a luxury rather has become a necessity. A typical power inverter converts a 12V DC power into standard 230V AC power for household use. It can also let you run the AC also in times of emergency. Besides household appliances like bulbs, fans, tubes, you can run various other devices like laptops, video-game players or portable DVD players and many more. You can use a power inverter for camping in parks also where there is no electricity connection provided. Most of the power inverters have built-in transfer switch. When utility power is resumed, you can switch back from inverter power. The transfer switch in the high-end inverters lets the external power to flow into appliances automatically. High quality inverters are very safe and reliable. In case of excess power usage, inverters switch them off themselves. Some inverters have GFCI protection. GFCI protection refers to Ground Fault Protection. When inverters are used outside the house, they are protected in case they get wet or damp. It resets itself and turns itself on after sensing the condition. This feature protects the user from dangers like electrical shocks and fire. Some of the reputed brands offering high quality inverters include Genus, Luminous, Su-Kam, Birla Power, Hykon, APC, Prolite, Videocon, Unitron, Microtek, True Power and Unique Max. When you look at inverter prices, they vary according to different brands and models. Inverters come in various sizes which are measured in watts. Size also affects the invert prices. To decide the size of the inverter, you need to first determine the total draw of devices you intend to use. You can calculate the power rating as Volts x Amp = Watts The wattage rating is printed on most of the devices. To determine the total wattage usage, you simply need to add up their power rating and see if it falls within the power specifications of the inverter. If you are planning to buy an inverter, you can search online shopping portals like Naaptol.com. They provide right information about inverter prices in India. You can compare the features of various inverters available in the market before making a decision. For more detail on Inverters log on to http://www.naaptol.com

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