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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904
Posted: 09:55am 12 Jan 2018
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My big two stack inverter has been performing well since I commissioned it. It passed a 6.2KW load test (resistive load) back then and has powered most of my tools and things in the house since.
A couple of days ago I did some MIG welding with my Transmig 175i. It worked OK, something my 3KW Power Jack clone did not manage to do.
However, yesterday, using the welder upset the big inverter. It dropped out and immediately auto re started. I could not maintain an arc after initial strike. My stick welder did the same BTW.
So I hooked up some loads to the inverter and looked at the output. It powered 4KW OK but switching on another kettle produced the brown out effect. The output voltage just collapses.
It always auto re starts when the extra load is turned off.
Its not an over current shut down, that would lock it off and has to be manually reset with my inverter.
So, what could induce the EG8110 to do that?
Anybody having any clues?
It can't be something busted or the whole thing would not work. The 10KW lithium battery bank was fully charged. Klaus
Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498
Posted: 10:39am 12 Jan 2018
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Hi Tinker I had something similar recently caused by the TIP35C on the MOSFET gate having a cracked leg. This was the result of the heat sink on it being bent backward and forward too many times. I replaced the IP35c and it worked properly again, before it would run fine at lower power levels but on high power (4+KW on a single toroid) it reset as you described. May not be the same fault but maybe a good place to start looking. There are only 10 types of people in the world: those who understand binary, and those who don't.
Clockmanfr Guru Joined: 23/10/2015 Location: FrancePosts: 429
Posted: 11:00am 12 Jan 2018
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Brown out?
In the beginning 'oztules' found a brown out situation when earthing on the domestic side of things with particular applainces.
"Ok, I have isolated the problem. As a stand alone inverter, it needs no changes.... but as a off grid type unit, it needs changes to the ac reading part.
Fortunately this is a very easy mod... we simply pull out the 4 x 50k resistors on the voltage divider, and replace them with a very small ac transformer any voltage so long as it is over 5vac to probably 30v or more.
It seems that because the original circuiit was designed to not place the AC either the load or neutral to ground... as this would blow things up if the MEN earth was messed up... safer for the unit to float....... so, they used the 200k as quasi isolation... the isolation you have when you have no isolation... that kind of isolation.
If you look at how they implemented it in the eg8010 data sheet, they have not accounted for a earthed neutral... which will short out one half of their voltage divider... this is what happened to me, the 240v became 120v just by plugging in the house leads... by using all kinds of tricks I reduced this to 15-20v.... but unstable with different environments.
The solar panels/battery and their earthing regime.... water dust etc ( is has been raining for 2 days here... another reason the problem became much easier to see) also changed the earth side of the DC and so this affected the result as well, so we can see that this system could be put off by competing earth loops.... high impedance ones as well" ...... Oztules.
I do not know your Inverter circuitry very well Tinker, so at present all i can suggest checking the above comments, then replacing the 8010 HT1536 chip.Everything is possible, just give me time.
3 HughP's 3.7m Wind T's (14 years). 5kW PV on 3 Trackers, (10 yrs). 21kW PV AC coupled SH GTI's. OzInverter created Grid. 1300ah 48v.
Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904
Posted: 01:08pm 12 Jan 2018
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Thanks guys, you gave me some ideas where to look. Those little TIP drivers connect into a terminal block, could be some were not screwed tight or loosened over time.
Clockman, my inverter does have the little transformer. My inverter is earthed and that earth wire is connected to neutral in the meter box. I will also try to connect the inverter earth directly to an earth rod close by, my other inverter is connected that way.Klaus
Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904
Posted: 09:34am 25 Jan 2018
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I found the cause and it was an easy fix .
On top of my double stack toroid is a little terminal where the capacitor connects at. I also take the 230V output from these two terminal posts.
Now, one of these was not very tightly done up , I suppose it was not keen to pass lots of current but happy enough to pass < 10A or so.
My test 4KW steady load and added 2.2KW startup from my abrasive offcut saw does not even make it blink now . This thing can handle way more than my battery could give for long.
Even with a steady 6KW load it takes quite some time for the fans to come on, it paid off to have a large heat sink and 24 Mosfets on it. The fans can keep up with this load on a 35 degree day for longer than my battery could.Klaus
Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498
Posted: 10:38am 25 Jan 2018
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Good to hear you got to the bottom of it, hopefully no smoke was released. You will have to have a word with the person responsible There are only 10 types of people in the world: those who understand binary, and those who don't.
Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814
Posted: 11:50am 25 Jan 2018
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Time to upgrade...
Drools.......
Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904
Posted: 01:11pm 25 Jan 2018
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I imagine 16 of those 335kg cells would beat Mad's forklift pack hands down by weight . I also think at that size they get a wee bit impractical but just imagine, you'd need to charge these monsters only every two weeks at my place.Klaus
Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814
Posted: 03:10pm 25 Jan 2018
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I cant see Trev using a pack of these in his hilux-he has how many in it 120??? maybe an electric semi-trailer??? lol
Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498
Posted: 09:14pm 25 Jan 2018
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What is the price of those? Going rate for Lithium is around $1 per WH which at that rate would put 16 of those at $500,000 AUD.There are only 10 types of people in the world: those who understand binary, and those who don't.
yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166
Posted: 03:51am 26 Jan 2018
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You better get a new supplier cos you are getting stiffed by about the price of a new cheap ferrari unless there is a free hat and keyring in the deal....or if Im getting a kickback. I'm confused, no wait... maybe I'm not...
Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498
Posted: 04:43am 26 Jan 2018
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Well that was the price I was quoted by several suppliers when I was looking recently at buying batteries. Some were even double that, FLA was pretty high also. I did ask on here but no one volunteered any better prices. So the best deal I found was $3,600 for a 775AH 48V refurbished forklift battery with 2 year warranty.
If you can get better prices why not volunteer some information?????
PS,
I did find this WB-LYP1000AHC, 3.2V, 1000AH, 560×360×130, 35kg $2000
So 13 times that is $26,000 USD a lot more than FLA and a 10,000 AH version is going to be in region of $260,000 USD, that's $353,000 AUD with GST Plus freight etc.
So was my estimate of $500,000 AUD that far-fetched? Maybe 20% over.Edited by Madness 2018-01-27There are only 10 types of people in the world: those who understand binary, and those who don't.
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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.
, I suppose it was not keen to pass lots of current but happy enough to pass < 10A or so.
. This thing can handle way more than my battery could give for long.
unless there is a free hat and keyring in the deal....or if Im getting a kickback.