Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated

[pmgr]

Hi  pmgr, all

26 V, 30 A

Maybe someone can answer where to that thin red wire goes , starting from first filter cap?

AND this question:   Check in film at 5min. 06sec. Arduino have just Start the program, The supercaps  holds  just below 25Volt and decreasing its  voltage slowly down to about 20 V,  while (1.5) -- 2 Amps is Now feeding the transformer!! Why 2 Amps when the charging of the super caps only took 0.5 Amps??
If there is a built in current limiter for charging?

Seaad, when did you download your video? Is this the very first video that Pierre uploaded or did you download it when he uploaded it a second time?

Unless my memory is failing me, I remember that the VERY FIRST video Pierre uploaded said 36V and it stated no amperage as far as I recollect (but again I might be wrong, I am getting old  ). I do recall that the font did not look the same yellow either as your image (see my image below with red font). Has anyone downloaded copies of each video after Pierre uploaded them the first time and the second time? Maybe they are different? The second version of the first video is 14:14min long total. How long is yours?

And regarding the small red wire, I believe that wire goes to the voltmeter for the supercaps? Maybe that explains everything! The measured voltage for the supercaps is not measured after the resistor but before the resistor (voltage of the small capacitor).


Correction: that small red wire does not appear to go to the voltmeter. It goes into the wire bundle that comes from the relays.


PmgR

[seaad]

pmgr

Q: ""when did you download your video? Is this the very first video that Pierre uploaded ""=  First vid 2018-02-28

The 2nd near identical but with more colorful labels and some cuts in mid of the film as I remember. I don't have that one.  /Arne

[citfta]

It appears that most of you don't know anything about welding.  Pierre says in the video that it is a home-made transformer.  If you look at the welds on the laminations they certainly look like home-made welds.  They do not look like welds made by machine which is the way almost everything is welded now days.  I believe he took a stock transformer and cut the welds with a grinder and then took it apart and then with his own designed coils reassembled the transformer and rewelded the laminations.  They certainly look like hand welded spots.

[seaad]

Don't the welding spots make shortcuts in the lamination with increased losses?   In my experimentation I always avoids "naked" ends (not primed) of the laminated sheets come together.  / Arne

[partzman]

It appears that most of you don't know anything about welding.  Pierre says in the video that it is a home-made transformer.  If you look at the welds on the laminations they certainly look like home-made welds.  They do not look like welds made by machine which is the way almost everything is welded now days.  I believe he took a stock transformer and cut the welds with a grinder and then took it apart and then with his own designed coils reassembled the transformer and rewelded the laminations.  They certainly look like hand welded spots.

Yes you are correct!  I had not noticed this previously but I have done considerable welding and those welds are definitely crude.  Welding is done in cores that are not held by frames or bolts in order to keep lamination noise down in low frequency power transformers and yes, the welds do create larger eddy current losses in the laminations.

So, the question is, did he rewind the entire transformer or just the secondary?  My guess would be just the secondary.

Regards,
Pm