inverter circuit wanted

I think you're better of and cheaper with a DC fan.

Rene

Who would choose an ID like "ruleworld" and then prove to be illiterate?

I have used a simple, cheap "modified sinewave" automotive inverter rated about 175 watts to run a floor fan, a fluorescent lamp, and a radio from a 12 volt SLA battery for a few hours during power failures. The output voltage reads about 110 VAC. Some meters might give a false reading on rectangular waveforms. 180 volts seems too low for a 220 V application and much too high for 120 V. Your UPS might be bad. You can probably do better with a DC fan and some white LEDs for light.

Paul

Hello Paul,

Same here. We have used a StatPower power pack (18Ah battery plus 300W inverter) to run the wood stove fans when the mains went. They were a little more noisy and didn't run as fast but I just cranked up their dimmer-like speed control.

Before this climate change stuff.... In the UK we would light the Paraffin Mantel Lamp and wonder at it's immense brightness. A few games of cards with toast, dripping and Bovril then off to bed with a flickery candle and extra bed things for warmyness.

I think they called it the winter of discontent so it might have been prophetic.

Of course, if you live in a hot place then it might not work like that.

Sucks to be you...... :-))

DNA

many technicians make these inverters where i live. theose units run two fan each 60w and two tube light 40w well for 2 hours. however fan runs at higher speed when power fails. they sell these units at least

Please post a link to the people who sell this units.

Or

Please list the manufactures of these units.

thank you

donald

Don't know what Bovril is but yes, mankind needs to re-learn basis skills. Heck, I had people ask me in a panicky voice how to get the car out of the garage after the power vent. All they had to do is look up and there is this little release thingie. Oh, and they had to come over to ask because, of course, they had thrown out their last non-cordless phone years ago. Duh...

When power went we played cards, cooked a nice meal, almost gourmet style and all that. The only complaint my wife had was that she'd like her regular coffee in the morning. Well, since it already was morning I rushed into the garage, bent up some thick fence wire and made a little rechaud burner. Ta-da!

People need to get used to living without A/C again. We did. Then the only problem in hot places like this is to guesstimate the probable duration of the outage and make a decision on whether or not to barbeque all that stuff in the freezer (and throw a huge party so it gets eaten). It might also be a good idea to fire up the TV once more to see if the outage was caused by a wildfire and whether you need to evacuate.

Uhh.. why would you want to make one? they're cheap enough:

And with a jump-start battery like this, you're in business.

Michael

Oh, your IP address indicates you're from Bangladesh. Don't think there's a Wal-Mart there... whoops...

You're on 220 VAC power, right?

Michael

what is ip address? yes i am on 220v ac. I managed to get a pwm circuit. dont know if it will run inductive load.

snipped-for-privacy@gmail.com wrote:

PWM circuits are used extensively for motor controllers, and even the cheap automotive inverters should run fans, power tools, and other inductive and regenerative devices. It is hard to imagine being able to build such a device cheaper than they can be bought, especially at yard sales, swap meets, and even on eBay. Perhaps 220 volt versions may not be as common or inexpensive, but the 120 VAC units will probably power a step-up transformer if needed.

If this is more for a learning experience, then there are many circuits that would be suitable to build, but usually there is a long learning curve with many burned out components before something reliable can be designed and used reliably. I would think that computer UPS supplies should also be able to handle inductive loads like fans, and I have found many of them at ham radio swap meets and other similar venues for almost nothing. Usually just the SLA battery is weak, and the components could be used to build what you need.

Good luck,

Paul

I lived in a town where the power went every time there was a storm, usually 3-4times a week. I bought a generator eventually. Now when the power goes out I spend half an hour yanking on the starter of that generator, and usually it only runs for half an hour or so then the power comes on. One day I will learn to give up. Alternativly I will one day start the genset every couple of weeks so its not a dog to get going.

I need to be locked inside with the AC on to avoid the mosquito's. I need my AC. Its a bugger that the genset is too small to run the AC.

I would use a Royer/Baxendall inverter designed to resonate at around 50 Hz. The frequency will vary with the load - it is possible to fix that with more circuitry but probably not really worth the effort since a commercial unit is USD 30 or thereabout.