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Godoh
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Joined: 26/09/2020
Location: Australia
Posts: 556

Posted: 06:08am 09 Sep 2024

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Hi Bryan, I use double pole DC breakers on the input side of my GTI inverters and also double pole AC breakers on the output.
The labels on my inverters say turn the output off first then the input to isolate them.
Turning off the AC breakers on the output shuts them down by anti islanding then isolating the panels from them makes them safe to work on.
300 volts DC would be pretty nasty if it got hold of you.
I run one of my GTI inverters at around 240 volts DC and the other is around 170 volts DC. I would have liked to keep the DC under the 120 volt level but the GTIs I have wont start up at that voltage.
Have fun
Glad to hear the ute just needed and oil change. Not sure why it would smoke so much and need a trailer but hopefully it is fixed
Pete

Revlac

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Joined: 31/12/2016
Location: Australia
Posts: 1167

Posted: 09:38am 06 Sep 2025

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If you want to scratch off some of the conformal coating and solder some wire onto the board, some details Here

And Here is the boards the code and setup, depends on which version you have, 2 resistor's on the power board were changed to 5K1, you might have done that all ready, there is version 1 and version 2 of the controller board if you use them or some other.

Cheers Aaron
Off The Grid

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1539

Posted: 04:23am 07 Sep 2025

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Hi Aaron thanks for those links mate lots of good reading too

Anyway dusted all the cobwebs of the inverter board and the driver board and had jacked red back to contend with

Now as I do have the HY5608 fets I'm only going to 3 on each leg to start as if I do blow them it's only 12 fets gone to fet heaven.

Got all the passives soldered in and this morning put all the 5 watt resistors on ready to solder in.

Now with the fet spacing for the heatsinks it has been that long the grey matter has kicked in so if one does have that measurement it could save me from doing it more than once due to incorrect spacing.

Regards Bryan

Edit: Ok measuring with my Verniers I got 24.4mm spacing between the centre hole of the each mosfet.
Edited 2025-09-07 15:26 by Bryan1

Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1539

Posted: 07:53am 07 Sep 2025

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Well finally got the main board all finished

now silly me after drilling didn't take the heatsink off the mill and sure enough on the 11th hole broke a tap

O'well my 3mm taps have lasted well over 20 years

so from then on took the heatsink off and deburred it and got the rest of the holes tapped. On one heatsink the original mounting hole on the Aerosharp got in the way but eh there is no real need to use 6 HY5608 fets each rail.

I still need to make some brackets to clamp the heatsinks and it does say the low side has to be isolated but this black duck doesn't know what side that is

so once I do know I can join the heatsinks on the high side.

Cheers Bryan

poida

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Joined: 02/02/2017
Location: Australia
Posts: 1439

Posted: 08:33am 07 Sep 2025

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my 4 x 4 FET inverter is still going since about Aug 2019.
I've seen 90+ AMPS at 50V into it. probably more.
It might be a how to say.."not quite perfect design" but it does not die.
IF..
if it has enough inductance at the highest DC current input and then some
on the primary choke.
And at high frequencies too.

if there is not enough, the short high current spikes will munt the FETs.
(munt being an Un Zud saying - waves to Solar Mike)

best of luck and keep a few coldies in the fridge.

wronger than a phone book full of wrong phone numbers

Revlac

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Joined: 31/12/2016
Location: Australia
Posts: 1167

Posted: 09:07am 07 Sep 2025

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Hi Bryan, For some reason I thought you had the original Red MAD Boards, anyway I forget things as well, I have a set of these green PCB's that Poida posted on the forum some time back, haven't built the power board yet, but have completed 2 of the controller boards, On the Power PCB (the side that has the 10 pin connector) under the heatsink on the PCB it is marked VS1 and VS2 and are split heatsinks.
Your build is looking good.

Cheers Aaron
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Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1539

Posted: 09:27am 07 Sep 2025

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Poida our house Selectronic SA32 has been going 24/7 since'04

and my shed Kipoint inverter where I sent an email to them in '05 with the same spec's of the Selectronic they designed a 3Kw around the spec's. I also mentioned don't bother with a LCD as it die over time so it was left out.

Now as I do have a heap of those HY5608 fets I will put one more on each leg so they run nice and cool under load.
Edited 2025-09-07 19:42 by Bryan1

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