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Forum Index : Electronics : Epever Inverter Repair

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Joined: 30/06/2019
Location: Australia
Posts: 20
Posted: 09:23am 16 Nov 2020
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Hello All
Before i found out about the OZINVERTER i bought an Epever Inverter, unfortunately it stopped working after 6 month, I was lucky enough to get a replacement and was able to keep the original. During the VIC lock down, beside start building OZNANOMAD inverter, i decided to take a look and see if i can repair the Epever inverter. Nothing seems to have burnt out so no obvious fault. Anyway due to building the OZNM i had bought some test equipment.

Finally i think i may have isolated the problem being 1 of 4 IGBT. Basically i was able to test all 4 and 1 out of the 4 didnt show a diode between Emitter and collector. So i am going to replace that one and see what happens.

Now the issue is trying to get a couple of the IGBT without paying for it thru the nose or wait 6 weeks for it to arrive.

The orignial IGBT is the NGTB75N65FL2WG and here is the data sheet: NGTB75N65FL2W

As i am still pretty raw to the electronic industry i was wondering if i can try a lower amp one. Which i can get from RS-components. Here is the data sheet.

The only thing i can see difference is the maximum current, i basically want to purchase 2 for testing and see if i can fix the problem, if it does i can replace them with the correct size IGBT at a later date.
Just wondering if  my thinking is ok.
Senior Member

Joined: 31/07/2017
Location: Australia
Posts: 298
Posted: 10:38pm 16 Nov 2020
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For smaller loads than designed for, should be perfectly fine... but if you want the original rating, you have to use at least the original igbts... which you are already aware of.
I think it works !!

Joined: 09/08/2007
Location: Australia
Posts: 3432
Posted: 12:18am 17 Nov 2020
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In fact when repairing something that has uber big expensive output devices, its actually good practice to do a first test with a cheaper and lower rated equivalent if possible.

If it goes bang again, fewer tears may be shed.  The smaller devices still make useful spares for the future, and one day you may be very glad you have them.
Cheers,  Tony.


Joined: 31/12/2016
Location: Australia
Posts: 376
Posted: 12:53pm 21 Nov 2020
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It might be a good idea to check the gate drive on that IGBT and the one next to it (if you haven't already), just in case.
Sometimes the gate resistor and or diode can get burned as well as the driver itself, missed one once and those 80A 650V IGBT's can really go off with a BANG, good to have the cover back on and stand back when it gets fired up, How did I learn this.

Was worth the experience and eventually had a successful repair, still going, longer than before the repair.
Cheers Aaron
Off The Grid
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