Audio amplifier as a DC-AC power inverter, any comment?

[(unknown)]

Thanks Tom, I've tried http://altenergy.blog-city.com but could not found what I need.  Maybe I'm lost.  If I may re-phrase my statement, what i really like to know is, can I use a high power audio amplifier as a DC-AC power inverter?  For instance, if I have a 60 Hz sine wave generator, a 500 watts audio amplifier both of which powered by a 12 Volts car battery, a 12/220V transformer (with 12V side connected to the audio output of this audio amp), can this setup produce a usable 220V, 60Hz power source?  What other implications on audio amp operation or output signal wave form can this setup create? Thanks for feedback anyone can give me. Nonx.

[commanda]

Theoretically yes. Efficiency is a problem. Car amp's aren't optimised for power conversion efficiency. Also, they're meant for playing music, not sine waves. The dynamics of "area under the curve" are different. I doubt a 500 watt car amplifier will deliver 500 watts at 60 Hz. Not for more than a couple of cycles anyway.

Second problem is regulation. Are you going to manually wind the volume up & down as the load changes?

Also, a power transformer is a lot more reactive than the speakers that the amplifier was designed to drive.

Maybe find a specialist in car audio, and ask them.

Amanda

[(unknown)]

Thanks Amanda.  What about those 12-volt booster amplifiers that are push-pull type with output auto-transformer, can that be re-wound to have a secondary to step-up to 220 volts the 12Vdc source by way of 60Hz sine wave in the input, in a level such that output wave form is not clipped?  Thanks.

Nonx

[nanotech]

Something I was thinking about is winding two coils.

One will be for the 12VDC

One will be for the 120VAC (or 220VAC in your case).

Wire the 12VDC coil to two slip rings so the current is always going through the coil in the same direction and mount it on a rotating shaft driven by a DC motor at exactly 360RPM (60Hz, right?)

Then make the 120VAC coil wrap around as a stator coil.

Essentially this will be a stepup transformer (kinda) with the 12V side on a rotating shaft.

How does everyone like this idea for a homebrewed inverter?  You could go with as large or small a windings as necessary to handle the current load you want, just make the stator winding count 10 times the rotor's, right? (12V on say 20 windings, 120V on 200 windings, correct?)

[drdongle]

This is called an "MG" set, way old technology, not very efficient.

[scottsAI]

Seems to me your trying to make an AC sin wave inverter on the cheap?

I will tell you how.

I bought an APC 3000 UPS for $125 w/ship on eBay. (Actually 4:-)

This unit is a sin wave output inverter. Internally runs on 48 volts. Internal Fans keep cool for long run times. I'm rewiring my home and using it as a UPS, when the power fails the UPS supplies the power. Has the transfer switch in side!

Other smaller APC UPS are sin output, I think as small as the 1000 watt units.

Broken units are very cheap. Warning, Not easy to repair. The transformers are worth the price to make your own design, make sure it has a fan, or add one, they get warm while running for a long time. The 3kw UPS draws 48 watts when not in use. I do not like this, so plan to put my own electronics in side.

Have fun.

[Jerry]

About using the 500 watt car amp as an inverter through at 12 volt to 220 volt transformer. The 500 watt car amp is primaraly designed to work into a 4 ohm load per chanel.

500 watts at 4 ohms is at around 45 volts. Ohms law EXE Devided by R = Watts.

The car amp rating was given as total power most likly for 2 chanels.

Another thing to keep in mind about CAR AUDIO. There are "NO" laws governing specs none zip doda there ain't any.

Your amp may do 500 watts or it may do 100 watts. Curenly the worlds most powerfull car amp does an acual 10,000 watts and that is trure actual RMS power.

This amp is from Earthquake the model PW-10000. We sell these. We use 4 of these in our record holding compitition SPL car ( a 78 ford curier).

Weve acctully clocked this amp at 13,344 watts into a 1/2 ohm inductive load.

The call these amps "Digital". There design is much like inverter and car speed controls.

I drive an 85 ford ranger. It is all electric. The curtis speed control is about 12" long 6" wide and 3" tall. Its rated 400 amps at 120 volt This is 48000 watts of control In a very small package.

Its a kik to drive,no gas bill.

                JK TAS Jerry

BTW TAS is for The Audio Source Of Salem. We do car adio and mobile electronics.

                  JK TAS Jerry