TheBackShed.com

Forum Index : Electronics : Wiseguy (WG) Inverter Build Discussions Australia

Page 2 of 2

Author

Message

GleamBright
Newbie

Joined: 21/04/2025
Location: Australia
Posts: 16

Posted: 12:18am 24 Apr 2026

Copy link to clipboard

Print this post

Hi Jake,

You're on the right track now, be encouraged.

We're about to place our PCB orders in the next couple of weeks. Generally we've advised non Oz based builders to buy direct from PCB manufacturers, due to prohibitive shipping costs. However, we could consider it if you're willing to bear the expense. Also, Not sure where your WG build is at, but we are using the most current PCB version issued by Wiseguy about a month ago, so compatability would be a consideration.

oreo

Senior Member

Joined: 11/12/2020
Location: Canada
Posts: 132

Posted: 04:25am 24 Apr 2026

Copy link to clipboard

Print this post

Just a short note on the sendust toroid cores for making the inductors.

There are 2 suppliers outside of the China companies you should consider.
Arnold/Micrometals making cores with the trade name of "Sendust".
Magnetics making cores with the trade name of "Kool Mu"

Both these types, have very similar performance and specifications.

When I look at Aliexpress at the cores suggested above, I see a very different price than they are seeing in Australia. For 4 packs of 3 cores, I am seeing $30.18cad for each pack of 3 along with $22.94 cad shipping for all 12. So call it $11.97 each. If you buy 6+ sets of 3 you get an additional 2% off, so $11.73.

If you look at the magnetics version of this core from Digikey, it is $11.44cad at quantity 10 and $9.57cad in quantities of 25.(you will be buying more that 25) So slightly cheaper and available locally with known good quality.
Magnetics 0077192A7

The distributor for Arnold/Micrometals (TME) does not currently have this core in stock, and I am not sure what their shipping costs are.
Micrometals MS-226060

As always, YMMV but it is worth checking out standard suppliers with this type of thing.

Greg

oreo

Senior Member

Joined: 11/12/2020
Location: Canada
Posts: 132

Posted: 04:33am 24 Apr 2026

Copy link to clipboard

Print this post

Greg

tinyt
Guru

Joined: 12/11/2017
Location: United States
Posts: 558

Posted: 05:14pm 24 Apr 2026

Copy link to clipboard

Print this post

Thus is how I wound my toroid primary. I did not use flexible welding cable. Instead I used 20 strands AWG #14 (20 x 2.0809 mm2 = 41.6 mm2.)

It is more work, but I think It allows for more copper in the winding space and the copper wires get cooled better.

It is a re-wound COTS 5 KVA transformer. The inverter it is used on has the following test results using stove heating elements for load:
Load % Efficiency
1.8 KVA 95.7%
4 KVA 91.9%
6.8 KVA 86.9%
7.8 KVA 84.7%

I used the same method for the choke.

Just sharing.

Edited 2026-04-25 03:21 by tinyt

jakesea
Newbie

Joined: 30/09/2023
Location: United Kingdom
Posts: 18

Posted: 06:48pm 24 Apr 2026

Copy link to clipboard

Print this post

Thanks GleamBright, I will check the WG thread and think about it. I am using older versions of boards that's for sure.

Thank you Greg for your help and a lot of useful information. I intend to research all these cores and their availability here in the UK this weekend

jakesea
Newbie

Joined: 30/09/2023
Location: United Kingdom
Posts: 18

Posted: 07:10pm 24 Apr 2026

Copy link to clipboard

Print this post

Thanks for sharing, tinyt. If I was to wind mine now I would consider doing it this way but I have mine wound exactly as per Ozinverter manual (welding cable) and I am definitely not re-doing it now if I dont have to after so much effort 😂.

Page 2 of 2

Print this page

To reply to this topic, you need to log in.