Author Topic: No brand/5500W inverter disaster porn  (Read 1046 times)

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Offline noneyabussiness

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Re: No brand/5500W inverter disaster porn
« Reply #75 on: August 13, 2021, 05:42:15 pm »
ok, removing the 393 does NOT remove over current control,  it gives it BACK to the eg8010 chip... the 393 was causing problems with blowing mosfets in oztules inverter ( and others including mine ).  it was as oz explained fighting the eg8010 current control ( which works perfectly fine) as it would " trip " in a instant and re-enable too fast, which with a tight toroidal transformer means certain death for primary mosfets as it introduces a non-constant waveform..  why he ended up building his own board to start with.

the eg8010's current control is VERY good, shuts down smoothly and never caused issues,  again with oztules and others ( including mine), as it takes its sample from the negative DC side there should be no " earthing " issues like the VFB side ( as that is sampled from the AC side) .. oztules thread on these boards is a treasure trove of information that is worth the read if you are interested, he explains things so much better..

Offline lighthunter

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Re: No brand/5500W inverter disaster porn
« Reply #76 on: August 13, 2021, 07:18:07 pm »
"ok, removing the 393 does NOT remove over current control,  it gives it BACK to the eg8010 chip... the 393 was causing problems"

Correct, i knew that and wrote it wrong.  Thanks for the correction.

As for isolation, my HV arrays are both ungrounded but to troubleshoot this i tried grounding both of them neg to earth. Didnt help. The battery + and - are floating not earthed but they are connected to a low V array which could act like an antenna. Ive no idea. I know it is an isolation problem but was not able to resolve in any way. So removing pin one helped me out. The only reason i  refered to the removal of the 393 is because deleting pin one of egs002 will solve that problem too but you would loose current shutdown wheras removing 393 doesnt. For some of us old fellers messing with surface mount stuff and ending up with a working board is quite a challenge.



Health Warning: May contain traces of nut!
LH

Offline Pete

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Re: No brand/5500W inverter disaster porn
« Reply #77 on: August 13, 2021, 09:36:36 pm »
Hi LH, I get what you are saying about surface mount boards. I have take two of the 393 chips off my 8010 boards, In the end I used a sharp knife and prised one leg of the chip off at a time while heating it with the soldering iron.
I tried first using solder braid but that did not take enough off to allow the chip to lift easily.
So reverted to mechanical force and heat.
So far the inverter I accidentally blew up is working now. The only odd thing is that to get the relay to pull in I have to short pins 1 and 2 of the op amp, then once the relay comes in all is good. I can turn off and it will start fine as long as I haven't disconnected the battery supply.
So I will run it for a while and see if it keeps behaving.
Pete

Offline noneyabussiness

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Re: No brand/5500W inverter disaster porn
« Reply #78 on: August 13, 2021, 11:04:01 pm »
another good way is using a  Stanley blade , cut hard against the 393 chip body,  both sides so actual chip falls away... then just use a blob of solder to remove " legs " ...

Offline Pete

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Re: No brand/5500W inverter disaster porn
« Reply #79 on: September 04, 2021, 02:04:32 am »
I have two of those Aliexpress type 8010 boards now. I used two transformers that came from an 8kw powerjack. One for each inverter.
Just wondering I have read that it is really important to get the right size inductor for the transformer to prevent blowups.
Both the transformers I have, used a torroidal core with a couple of turns of the primary winding around them as inductors.
Have any of you people who have used these boards had experience with inductors and do you know if the PowerJack ones are OK to use.
So far the inverters appear to be working fine, nice sinewave but I have not tried any massive loads on them yet.
I wanted to know that there is a fair chance that they won't blow up before I went for the full load tests.
Pete

Offline noneyabussiness

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Re: No brand/5500W inverter disaster porn
« Reply #80 on: September 04, 2021, 06:53:42 pm »
reading Oztules thread, the pj ones were fine... however Warpspeed has improved on em dramatically by other peoples experience...

Offline Pete

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Re: No brand/5500W inverter disaster porn
« Reply #81 on: September 04, 2021, 09:35:01 pm »
Thanks Noneya, will read up on Warps inductors
Pete