Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2071
| Posted: 11:27pm 12 Jul 2024 |
Hi all:
Yes Rodger I agree, but, and there is always a but, in this case there is no length to go to, Hack off the outer 230v winding and sit one on top of the other, wrap a bit of fiberglass tape around cores, put 14 turns of battery cable through - about 4 minutes to put the cable through, and one 3 stack Toriod transformer ready to go.
It will take me some time to get it all set up, I have a sh*t load of work to do around the property, and I have to build the new cabinets.
I have really learnt a lot from the first three builds, now I know exactly what works and all the unforeseen problems I had not considered - So it's only a time constraint at the moment as everything is already planned out and locked in.
Mike, I visited a friend who had planned to build an inverter with my help over a year ago, he eventually found the three correct Solar inverters and had removed the toriods, sadly health issues have derailed his plans - a "relatively" low cost commercial system I helped him put together is still running fine though. So I came home with the three toroids.
That picture makes me cry - A solar installer told me of the hundreds they literately threw in the tip over the past few years from school upgrades, these older SMA are getting as rare as hens teeth, and some people are still asking hundreds of dollars for one - crazy.
Cpoc I have run close to 8kW for 20 minutes on the current inverter, these 3 stack toroids are good for about 5kW sustained running with some toriod cooling, I almost never have that load level, but I do have short high peak demands.
With two of these 3-stack transformers and two power stages there is no doubt that it will run at 15kW, but not for long (toriod heat), but 8kW - 10kW should be a walk in the park, and way more than I would ever need.
You larger Toroids, combined with a slightly heaver output winding should have no trouble with 6kw for one set - 12kW should be easy.
The power limit really comes down to connection quality and loss (heat), you seem to have that fully under control and know exactly what you are doing from what I've seen in your posts, so keeping the Toroids and chokes at a reasonable temperature is likely the only limiting factor.
EDIT Removing center plug: I have a large tool socket the fits in the center hole, I support the Toroid on four blocks of timber on a concrete floor, use a small sledge hammer to hit the center plug out. It really sticks to the wrapping tape, I haven't tried cutting the wrapping with a Stanley knife first, I think it would come away easier if I did, about 6 hard blows usually gets it moving. I might try cutting the tape and removing one of these new cores today.
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Edited 2024-07-13 10:35 by KeepIS