Using multiple DC o AC power inverters question

[Nobody]

It's been a long time since the college electronics labs, but would it
be feasable to:

Take 2 or 3 of the el'chepo DC to 110Vac power inverters, wire them
each into a 1:1 AC isolation Xformer. The wire the AC isolation
outputs in parallel. Connect it all up into a GFI outlet with a 15A
breaker to get a higher output current rate?

Thanks everyone for any input, and even reading this...

JJ

 

[Ian Stirling]

It's been a long time since the college electronics labs, but would it
be feasable to:

Take 2 or 3 of the el'chepo DC to 110Vac power inverters, wire them
each into a 1:1 AC isolation Xformer. The wire the AC isolation
outputs in parallel. Connect it all up into a GFI outlet with a 15A
breaker to get a higher output current rate?

Err, no.
The AC, while of the same nomianl voltage and frequency will not be the
same phase.
They will rapidly go bang.

 

[mc]

You cannot put different AC sources in parallel like batteries. They won't
be in phase. Some of them will be wanting to swing positive when others are
swinging negative. Remember what AC *is*...

 

[Joerg]

Nobody wrote:

It's been a long time since the college electronics labs, but would it
be feasable to:

Take 2 or 3 of the el'chepo DC to 110Vac power inverters, wire them
each into a 1:1 AC isolation Xformer. The wire the AC isolation
outputs in parallel. Connect it all up into a GFI outlet with a 15A
breaker to get a higher output current rate?

No. They are never 100% the same plus if one fails the other two will
try to feed it "from the back". You might come home to find several fire
engines around the smoldering remains of your house.

 

[budgie]

It's been a long time since the college electronics labs, but would it
be feasable to:

Take 2 or 3 of the el'chepo DC to 110Vac power inverters, wire them
each into a 1:1 AC isolation Xformer. The wire the AC isolation
outputs in parallel. Connect it all up into a GFI outlet with a 15A
breaker to get a higher output current rate?

As others have pointed out, the phase of the AC outputs would have a random
relationship, and varying with time as well. To achieve a workable
configuration, one needs to be made master and the inverters of the others
driven from that master. Then you only need worry about voltage differences and
the effect of circulating currents.

Simplest way to get a bigger inverter is buy one.

 

[ehsjr]

You cannot put different AC sources in parallel like batteries. They won't
be in phase. Some of them will be wanting to swing positive when others are
swinging negative. Remember what AC *is*...

Nothing to do with what AC is, everything to do with the
way it is "made". Rotary 120V AC generators of the same or
close to the same frequency can happily be paralleled.
They will frequency & phase lock to one another when done
properly.

Inverters are a whole 'nother story.
Ed