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Forum Index : Wanted : Wanted: Source for 8-10Kw toroid cores.
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sPuDd Senior Member  Joined: 10/07/2007 Location: AustraliaPosts: 251 |
Hello all, I'm building an 8-10Kw 48V inverter. The inverter etc I can make, but I've been unable to find a suitable source of cores. The Asian manufacturers will ship them if you want a minimum of 10 units. Is there an Australian manufacturer who has cores I could stack for more power, or just has that kind of item without making a one-off? Is there a large toroid used in some piece of equipment that I could strip down & stack for a new core? I'd like a larger inner diameter to accommodate easier winding. I may wrap the primary as multiple large enamelled winding wire inside fibreglass woven cloth tubing rather than PVC insulated regular cable. Better cooling. The whole core will be carefully supported and forced air cooled. My minimum load power is about 300 watts. Average load is about 1000 watts. High load is 7500 watts for a few hours. There will be an EV slurping up more power at a later date. Also, this will not be a budget build, so spending money on a quality core that lasts forever is where I stand. Much appreciated, sPuDd.. Edited 2023-03-30 16:03 by sPuDd It should work ...in theory |
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| Godoh Senior Member Joined: 26/09/2020 Location: AustraliaPosts: 278 |
You could try someone who makes Torroids and sells inverters, transformers etc. Tortech are one mob I know of, I have seen another company in WA advertising on Gumtree but can't recall their name at the moment. Pete |
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Revlac Guru  Joined: 31/12/2016 Location: AustraliaPosts: 849 |
sPuDd. You could try, https://www.aemcores.com.au/technology/unicore/duocore/ Mark is very helpful if he is still there. Cheers Aaron Off The Grid |
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| sPuDd Senior Member Joined: 10/07/2007 Location: AustraliaPosts: 251 |
Thanks Godoh and Revlac, I'll give them both a call and see if they have any cores available. sPuDd.. It should work ...in theory |
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Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
I priced getting Toroids made some time ago and the prices were huge for an Australian made one. Getting them from Asia is much cheaper but the freight is a killer. If I were you I would go around to all the local solar installers and offer beer for Aerosharps if they find any. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| rogerdw Guru Joined: 22/10/2019 Location: AustraliaPosts: 696 |
I scored an early type BP 6Kw GTI with a toroid. It is a rebadged SMA and the toroid is encapsulated, but that would still make a great start. I also priced a toroid from AEM Cores and while I ended up building up a core using most of 4 x 3Kw Aerosharp toroids, I think if I was starting again I would simply pay the money. I'm in SA, so could avoid freight costs by picking it up. The reason I didn't buy one was mainly because to get the size I wanted I still would have had to sandwich two together, though I'm pretty sure I could have still made it work with a flatter and larger diameter. An advantage would be that they also 'anneal' them or whatever the process is once wound. IRRC 100mm is the widest material they use, so there are limits still. Having said that, it wasn't really all that difficult to build up the cores I used ... BUT ... one version of 3Kw Aerosharp toroids is made up of hundreds of short pieces of material ... and that would be difficult to use to keep nice and tight. On the other hand, the other version with blue tape around it, are wound with one continuous piece and they worked beautifully. I rang around several years ago and found a repairer who was happy to sell me any inverter he got in, for $25 each. I don't get to Adelaide all that often, but when I do I call in and pick up various stuff. Apart from all the Aerosharps I've collected, I occasionally pick up something else just to take home to play with. Best entertainment you can get for $25.  I had never seen any SMA stuff, so bought one to check it out. While it is transformerless (that's where the TL comes from in the model number) I was super impressed at how they are built. With a power driver, you can have it apart and down to all its basic bits inside minutes ... like 3 or 4 perhaps. Not that anyone ever fixes them I suppose, but all the same I was impressed with the design and the build quality. Cheers, Roger |
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