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Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1697

Posted: 05:24am 01 Mar 2026

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Keepis I did try your gui but the path.ini failed so in the end I just went with the commandline avrdude

KeepIS

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Joined: 13/10/2014
Location: Australia
Posts: 2062

Posted: 05:46am 01 Mar 2026

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You need the GUI script and the settings file in the same directory.

From the GUI click the Help button, and it will tell you what should be in the file and the correct name of the file.

No problems, when you get the inverter sorted, we can always look further into it.

NANO:Inverter V 8.2ks - Linux AvrDude GUI script V3.3

tinyt
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Joined: 12/11/2017
Location: United States
Posts: 492

Posted: 05:55am 01 Mar 2026

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Bryan1 said Ok with this wet weather got the noise of my genset going to charge the shed battery.

Anyway powered up the controller board and measured 17.8 volts on the 18V zener, now when the ohm meter is used the Vbat + and VBat - are shorted out. Doing an ohm check on a few fets shows the gate is isolated and the source and drain pins are a dead short, so would this mean the fets are gone?

Anyway setup the scope and got a pic of the L01 and L02 first test

Regards Bryan

Your scope H setting should be in the milliseconds and not nanoseconds so that you can display at least 3 cycles of 50Hz.

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1697

Posted: 05:24am 02 Mar 2026

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Any finally noticed that cable on the avrdude was a 10 pin one

just long enough to reach the power board so gave it a test.

So the BV is working and showing the same voltage as my old fluke scope meter and I tried first @ 24 volts and 200mA where the BV stopped at 11.1 volts so turned off the PSU and adjust the current to 400mA. When turned it back on the current went to 207mA. Now upping the voltage to 27 volts didn't change the BV voltage.

Now I did another test with my fluke scope meter and moved the Vbat voltage to 28 volts which did see the AC voltage to a whole 3 volts where the fluke was a clean sinewave and 49hz.

So first signs of life

Silly me did have the 10 pin backwards

so I am wondering those new fet drivers may have quietly let out the magic smoke.
Edited 2026-03-02 16:23 by Bryan1

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1697

Posted: 06:02am 03 Mar 2026

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Ok just spent a few hours putting the pin connectors for all the wiring and put new 2184 fet driver chips in and still got that BV stuck at 11.1 volts with 28 volts input.

Now take the ribbon cable off which is the correct way this time

and the Vbat goes straight upto 24 volts with less than 100mA of current.

So with a new control board all with new parts and I did do several checks to ensure all components are in correct.

I'm now at a loss at what is wrong as everything is connected properly and that green led on the power board stayed on with the test above.

Regards Bryan

Revlac

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Joined: 31/12/2016
Location: Australia
Posts: 1221

Posted: 06:25am 03 Mar 2026

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Bryan, I might get a chance tonight to look at it, or tomorrow, already loaded the code (on previous page) and it ran ok, At around 20v from the power supply green light on and running I had 15Vac at the power board primary, No toroid connected, I did try a small scope on the primaries and its quit choppy as expected with no filters or caps.
Will get back later, but it seems like your very close to running.

Edited 2026-03-03 16:28 by Revlac

Cheers Aaron
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Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1697

Posted: 01:22am 04 Mar 2026

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Well took the power board out this morning and nothing looked out of place although I did clean off the flux from around the solder pads to clean it up.

Did an ohm check on all the fets and all of them were same with drain measuring around 196K so they all look ok.

Put the board back in and no change with a 28 volt 300mA input it's drawing 255mA and the BV is staying around 11 volts so no change.

Revlac

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Joined: 31/12/2016
Location: Australia
Posts: 1221

Posted: 02:34am 04 Mar 2026

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With power off and the 10 pin connector removed from the controller pcb I measured 55k between the 60V supply terminal and pinA3 on the nano on the 2 controllers I have, this is for the battery voltage sense, I still don't have a display connected yet to check and see the BV on the screen when its up and running.
Edited 2026-03-04 12:35 by Revlac

Cheers Aaron
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Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1697

Posted: 03:26am 04 Mar 2026

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Ok I did take out the ribbon cable from the control board and got the same 55K from the 60 volt to A3 but get this those 60 volt pins on the connector aren't even connected on the control board and I left that Vbat rail(60 volt) connection off due to the burn out last time.

Now also with the ribbon cable disconnected the VBat shown on my DMM is 24 volts from the 28 volt input supply where the current was only 75mA.

Now with the ribbon in place the BV is 11.3 volts with a 254mA draw, the green led on the power is lit.

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