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Forum Index : Electronics : Potential transformer source

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johansen
Newbie

Joined: 01/08/2014
Location: United States
Posts: 8
Posted: 11:40pm 10 Oct 2025
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Ive acquired a triplite su6000xfmrrt3u UPS..

The toroidal transformer is a foot in diameter and 4 inches thick (dimensions of the outer winding)


Its got a 208-240 primary and a 120-208-240 secondary.

Only pulls 19 watts no load losses.


The center hole remaining in the winding (you would need to chip the epoxy out) is large enough you would not need to remove the secondary, both could be connected in parallel.

I chipped the core out and get a useable diameter of 4 inches. Transformer is sitting at 1.4 volts per turn of 8 gauge copper. Unfortunatly the 120/240 secondary is on top of the 208-240 primary which is under a copper foil shield so its got to get unwound. If i decide to do that.
Edited 2025-10-11 10:30 by johansen
 
KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 1915
Posted: 04:46am 11 Oct 2025
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If you have an idea of the number of turns you need and you measure the cross sectional area of the core, punch some numbers into an online calculator like this, Flux-Density Calc it might help with the answer, aim for 10,000 Gauss or a bit less to keep the core away from saturation.

Sounds like quite a good candidate though.
NANO Inverter: Full download - Only Hex Ver 8.1Ks
 
Godoh
Guru

Joined: 26/09/2020
Location: Australia
Posts: 574
Posted: 08:01am 11 Oct 2025
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I just looked up that unit you have, they are incredibly expensive.
It would have to be a dead UPS to be worth salvaging the transformers from.
Good luck
Pete
 
oreo

Senior Member

Joined: 11/12/2020
Location: Canada
Posts: 116
Posted: 12:52pm 11 Oct 2025
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That is a good find.
I presume it is similar to this one?
video

Yes, these Tripp lite units are pretty expensive.  APC and Tripp lite make similar 5kva units which are much cheaper, however I presume they don't have toroidal transformers?

APC 5kva

5kva tripp lite
Greg
 
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