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Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1619

Posted: 07:55am 06 Dec 2025

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Went upto Rogers after work today and what a learning experience it was helping solder on the wire to the board

So VS1 & VS2 now have 50sqmm wire on each pad and had enough length off the toroid wire for the battery connect so 65sqmm

So the 50sqmm wire for VS1 & Vs2 will be bent down to attach to each choke, now we did measure the inductance using Rogers meter and both chokes came in a 24uH within a point of each other so good to see they are matched.

Now I did mention about charging the caps before turn on and suggested the battery connect would do it and got told well the inrush of current to charge the caps will show the fireworks

and a bleed resistor is required to limit the current on the positive rail to charge the caps. So lesson learned and that is one thing I never read in all the reading on this inverter.

So one step closer.

Regards Bryan

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1619

Posted: 06:54am 10 Dec 2025

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Well in my gear I did find 3 off 40 watt 200ohm resistors that all measure within 3 ohms so I could use one of them to slowly charge the caps before the first turn on.

Now for members that have build this inverter how did you guy's go about charging the caps

Regards Bryan

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1619

Posted: 09:02am 17 Jan 2026

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G'Day Guy's,
Well finally had an afternoon to work on this inverter after work today and after installing the fan got the box in it's new home and got the Anderson Connector all done

So getting closer...

Cheers Bryan

rogerdw
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Joined: 22/10/2019
Location: Australia
Posts: 952

Posted: 09:29am 17 Jan 2026

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That's looking good Bryan, definitely getting closer.

Cheers, Roger

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1619

Posted: 08:04am 18 Jan 2026

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Well got a bit more done today and it was taking 3 steps forward and one step back

Found some old terminal block so cut it in half and screwed them onto the perspex plate only to find one of the closures was buggered

So that idea is going to be scrapped and I'll machine up some new terminal blocks.

Then got onto the finish soldering the brain board and soldered up the lcd board where silly me didn't see the front holes on the nano aren't used and lost a couple of pads desoldering.

So went and grabbed another Nano and soldered everything in properly and found out the hard way where last time I had to use my good laptop to program the nanos last time as both the linux and my shed computer wouldn't program the Nano.

I will get more done thru the week and hopefully next weekend it will be finished then the fun can start and see if it will power my mig welder.

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