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kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 04:28am 22 Jul 2019
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I removed the black potting from my toroid. It took me several hours. Trying to fiqure out how to unwind it. Its 144lbs and I can hardly lift it. I was thinking about hanging it from the rafters in my garage.
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 04:30am 22 Jul 2019
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For testing the toroid I connect live to red and neutral to one of the black wires?
Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406
Posted: 04:40am 22 Jul 2019
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The two red wires are 240v.Cheers, Tony.
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 04:43am 22 Jul 2019
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Make sure you have a lightbulb with a switch across it has to be old type filament light bulb
Not sure about the wires I would have to see the Transformer and the wires coming out of itbe warned i am good parrot but Dumber than a box of rocks
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 04:44am 22 Jul 2019
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I think he's wanting to test it with 110 warp-speed the wiseEdited by BenandAmber 2019-07-23be warned i am good parrot but Dumber than a box of rocks
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 01:19pm 23 Jul 2019
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123V on the 240V winding gave 46.7V on the 90V winding with 17W idle and with 27 additional turns on the 90V winding I got 97V out and 17W idle 123V on the 90V winding with the 27 extra turns gave 156V out with 29W idle
tinyt Guru Joined: 12/11/2017 Location: United StatesPosts: 438
Posted: 02:49pm 23 Jul 2019
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Let me see if I understand your test setup:
So, 97 - 46.7 = 50.3V across the 27 turns (please confirm)
Assuming the above is correct, for 17W idle, your turns per volt = 27/50.3 = 0.536 or volts per turn = 50.3/27 = 1.863
The 90V winding can be assumed to have 46.7 x 0.536 = 25 turns The 240V winding can be assumed to have 123 x 0.536 = 66 turns
I don't know what the ideal idle wattage is for the core size you have. Maybe the 29W idle is acceptable.
If you go for 17W idle and just want a single 120V output, you don't have to touch the 240V winding, just use it as the 120V secondary output of your inverter (assuming the 240v winding is the one adjacent to the core). But you might not want to do this because you will have more copper loss and lower wattage capability.
I don't know if the wire size for the primary will fit in the remaining space to still get 10KW.
I think this still needs further study to get dual 120V output, low idle power, and 10KW capable.Edited by tinyt 2019-07-25
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 04:51pm 23 Jul 2019
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Yeah your hypothesis is correct
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 07:07pm 23 Jul 2019
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A lot of these guys on here run grid ties during the day along with their inverters Madness being one of them if you have any questions
I don't think we have a second hand market for these grid ties here in the United States I could be wrong though
So that big Transformer might be just as exactly what you need
I know I drooled over that Transformer for over a year no one would respond to me
Very excited about this build please keep us updatedbe warned i am good parrot but Dumber than a box of rocks
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 08:13am 27 Jul 2019
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I started to unwind the outermost winding There are 5 strands of 4.6mm diameter enamled copper for each turn. I'm not sure how I am going to manage to rewind using this wire. I was thinking about maybe using this core and getting some more cores to make a warpInverter because they seem better.
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 09:06pm 29 Jul 2019
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Got these in the mail today.
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 12:46am 30 Jul 2019
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Them are nicebe warned i am good parrot but Dumber than a box of rocks
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 10:01pm 11 Aug 2019
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The 5 4.6mm wires are connected together and then connect to a 1 AWG wire. If the cross sectiontial area of the 5 4.6mm wires is (16.8mm2 * 5) 84mm2 why do the 5 4.6mm wires connect to a 1 AWG wire with a cross sectional area of only 42.4mm2 ?
Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406
Posted: 10:47pm 11 Aug 2019
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The problem is heat and temperature rise.
A single wire can run at a much higher current density because it is surrounded by air and has better cooling.
If you wrap the same wire around to form a solid transformer winding with many turns, the heat cannot get out, and the whole thing gets very hot.
So you need to reduce the current rating, or use thicker wire inside a transformer than the wires coming out of the transformer.Cheers, Tony.
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Posted: 03:05am 13 Aug 2019
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I removed the 90V winding on the outside. Do I need to mess with the 240v winding to get 120v split phase?
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 03:15am 13 Aug 2019
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Does the 240 volt winding have a Center tapbe warned i am good parrot but Dumber than a box of rocks
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 03:16am 13 Aug 2019
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Does the 240 volt winding have a Center tap
If not then probably not
Warp speed is awesome when it comes to Transformers (or anything else) if that Transformer ain't exactly what you want
I would get with him and Rewind it the way you want it
This may be something you're using for the next 20 years make it right exactly the way you want it the first time but that's my opinion anyway
It's a lot of work to wind a Transformer but I do it and have done a bunch of them and your skill level is quite a bit beyond mine Edited 2019-08-13 13:20 by BenandAmberbe warned i am good parrot but Dumber than a box of rocks
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 03:21am 13 Aug 2019
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Or I'll just trade you a 52-pound 5000 watt 1 that's a factory Transformer LOL
Amber winds most of our Transformers
That thing should be really easy to totally rewind there shouldn't be very many terms at all like there would be on a small one it should be cake besides it just been so heavy Edited 2019-08-13 13:24 by BenandAmberbe warned i am good parrot but Dumber than a box of rocks
Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406
Posted: 08:44pm 13 Aug 2019
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It looks like you will have to strip off the secondary and start from scratch with a bare core. Then you can rewind it to have a far lower idling current, and fit two 110v secondaries.Cheers, Tony.
kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 89
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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