Using two single phase inverters instead of a split phase inverter

harrisonpatm said:

Can someone explain why this did indeed work in the video linked by OGITC?

Click to expand...

Yup, he says it right towards the beginning:

0:39 mark:

"The one caveat with this is that we are not going to be able to power our 240V circuit and the most we're going to be able to power without using a transformer that actually steps the voltage up is going to be 120V


and then later on:
1:48 mark:

"This power bank here is essentially going to power every other leg in our 240V panel, and this one will serve every other leg"


And at this mark he shows exactly what I was referring to with oscillating voltage
4:08 mark:

As you can see when he connects across the two hot legs, the voltage starts at ~195VAC, then is slowly goes up to ~240VAC, then it starts to drop all the way down to almost zero VAC, and then starts to climb again

He refers to it as "Weird voltage". But what is happening is that the two sine waves are not in sync with each other. And as time passes, the waves will become 180* of each other, which cancels out and becomes zero volts. Then as they swing back to 0* of each other, 240VAC will show up again.
The reason this is happening is that if he were to show the frequency of each of the inverters, you'd see that they are
1) not identical. One of them could be 58Hz, and the other 60Hz, or even 59Hz and 62Hz, or something of that sort
2) not in sync and drifting back and forth, because of #1

This is the same phenomenon that occurs with sound canceling headphones. The mic picks up the audio on one side, and then outputs it on the speaker side 180* off so that the sound is canceled out

Yup, he says it right towards the beginning:0:39 mark: View: https://youtu.be/WZS7-0KPYwU?t=39 "The one caveat with this is that we aregoing to be able to power our 240V circuit and the most we're going to be able to power without using a transformer that actually steps the voltage up is going to be 120Vand then later on:1:48 mark: View: https://youtu.be/WZS7-0KPYwU?t=108 "This power bank here is essentially going to power every other leg in our 240V panel, and this one will serve every other leg"And at this mark he shows exactly what I was referring to with oscillating voltage4:08 mark: View: https://youtu.be/WZS7-0KPYwU?t=248 As you can see when he connects across the two hot legs, the voltage starts at ~195VAC, then is slowly goes up to ~240VAC, then it starts to drop all the way down to almost zero VAC, and then starts to climb againHe refers to it as "Weird voltage". But what is happening is that the two sine waves are not in sync with each other. And as time passes, the waves will become 180* of each other, which cancels out and becomes zero volts. Then as they swing back to 0* of each other, 240VAC will show up again.The reason this is happening is that if he were to show theof each of the inverters, you'd see that they are1) not identical. One of them could be 58Hz, and the other 60Hz, or even 59Hz and 62Hz, or something of that sort2) not in sync and drifting back and forth, because of #1This is the same phenomenon that occurs with sound canceling headphones. The mic picks up the audio on one side, and then outputs it on the speaker side 180* off so that the sound is canceled out