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Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1650

Posted: 05:46am 10 Feb 2026

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phil99 said The blown track in the middle of that pic. may need looking into as well!
You need to find what caused that.

More than likely this was self inflicted when I was setting up the buck converter and I have removed all the raised track and probed the board where no more shorts were found

I will solder some insulated wire to restore the connection but honestly was this track even needed as where it connects is at Vbat already ?

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2991

Posted: 05:57am 10 Feb 2026

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Quote was this track even needed as where it connects is at Vbat already ?

That may be the answer. During the capacitor charging phase all the initial charging current would have gone through that track, bypassing the resistors. Way more than it could handle.

Unless the experts advise otherwise leave it out.
Edited 2026-02-10 15:59 by phil99

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1650

Posted: 06:10am 10 Feb 2026

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Yea I did make a positive and negative rails to terminate the wires easily and that connection was on the positive rail so I think you hit the nail on the head with that answer Phill.

Anyway this is tomorrows job as it is a warm one and I will see how it goes running the inverter off the psu.

I do still need to install the resistor bank and the 450amp switch once the inverter is tested and working.

Regards Bryan

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1650

Posted: 08:13am 10 Feb 2026

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The more I'm thinking about this as I do have 2 more of the circuit boards for this inverter and in reality 2 more Aerosharp toroids to donate as that aliexpress inverter can make way for the project.

Now today TinyT did provide some great suggestions for probing the IDC connector but it was a pain to setup those cheap male to female connectors I bought as most got loose with my 9" screen project that went south.

So I do think a circuit board should be made to make the scope connections easier then as each inverter is made that 2K pot can be tuned so the inverter can go keep powering what I throw at it which will be my Unimig Viper 182 mig welder.

Now as this is on 24 volts I do think it will be flatout on 4Kw and the only thing stopping me from going to 48 volts is that buck converter as the one I got has a 35 volt max voltage and I do need to find some that are 48 volt. Oh and another matched 48 volt batterybank.

Anyway I am happy the problem was found so tomorrow does look promising.

Regards Bryan

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