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.
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 02:20am 03 Jul 2019
Copy link to clipboard
Print this post
LadyN before I would spend money on a high-frequency I would buy one of those cheap inverter boards like the first one I built only $29
Or you can get one like poida the great ran for a long time for around for eighty bucks
One of the 10000 watt boards with the totem pole drivers just like my red one I built with the 24 h y 008 are $150 bucks
Any of those routes would be cheaper than buying one high frequency inverter and what gives you a lot better results
hook whichever one of those you get up to that Transformer Amber sending you
If you do decide to get one of those little 4 mosfet boards for $29 let me know and I'll send you a few hy4008 mosfets to put in it like I did mine
That Transformer is out of a 8000 watt power jack I think warpspeed said it was probably more like 2000 watt continuous
I've seen them run that exact same Transformer at 4000 Watts online
I'm sure it gets very hot at 4000 but you are not likely to be running that very long
Warp speed estimate was for continuous
You can get I think a five or six thousand watt board for a hundred bucks
Anyway you would decide to go would be a lot better than high frequency
Jacob is back in town right now that Transformer will be sent out here in the next couple days probably after the 4th of July but it will be coming very soon Edited by BenandAmber 2019-07-04be warned i am good parrot but Dumber than a box of rocks
stockleys Regular Member Joined: 21/06/2019 Location: United KingdomPosts: 54
Posted: 08:00am 03 Jul 2019
Copy link to clipboard
Print this post
Of course I will keep you posted. Over night, I pulled 990wh. (Fridge, laptop, phone charger and an air purifier). I ran the kettle from it this morning with no drama. I do need some more batteries soon. Loads of sun at the moment, not much capacity to store it.
Yes. All for the sake of a snubber diode I still don’t know why the originals failed after switching it off in the first place. But everything on the dc-A.C. side is new now. So fingers crossed. I’m now not going to switch it off unless absolutely necessary
I still think the kettle is going to be the biggest demand. But wanted over sized inverter so it’s under less stress.
Benandamber, I think ladyn wanted to get a broken hf inverter to experiment with and repair as a learning project.
I found out, my inverter new was around the £400 mark. So not cheap cheap but not expensive at the same time. I have seen so called 2000w inverters for £80. I some how think mine is better than that.
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 07:49pm 03 Jul 2019
Copy link to clipboard
Print this post
I tried to give her a high frequency inverter that I ran air conditioner in an RV
And there was nothing wrong with it I had just used the case for a low frequency inverter
If your inverter uses the exact same design as the oo2 board
it has a flaw You Can Read All About It on here
poida the Great had me do some work to the oo2 board so this flaw was removed
The flaw makes an inverter blow up just out of the blue
From everything I've read on the web people usually eventually move over to low frequency
Well you're high frequency inverter is working
Could I get you to consider
building you a low-frequency inverter they are cheap lots of fun and you can get help on here
You had the skills to fix your high frequency one
I'm sure you'll have the skills to build a low frequency one
You just have to read and follow directions I know nothing and it worked out good for me
Everyone needs a backup inverter
Edited by BenandAmber 2019-07-05be warned i am good parrot but Dumber than a box of rocks
stockleys Regular Member Joined: 21/06/2019 Location: United KingdomPosts: 54
Posted: 10:07pm 03 Jul 2019
Copy link to clipboard
Print this post
i was contemplating it when i was having issues (by my stupidity) with repairing this inverter.
but to be honest, space is tight (untill we move)
i only have a small space in which to place my batteries, controller, inverter etc. along with my work gear (water filtration for window cleaning)
im hoping once my first born is here (5 weeks ) we may be able to get a bigger place. only down side is, out garden is south facing and gets direct sun from 7:30am till 9pm (this time of year) so im getting over 13 hours of direct sun to my solar panels. not many gardens around here can boast that due to the density of other buildings.
how would the 002 make any difference on a hf or a lf inverter? the board does the same job on each right?
my inverter didnt have an egs002 originally, but it does now.
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 06:19am 04 Jul 2019
Copy link to clipboard
Print this post
Honestly I don't know enough about it to tell you exactly what's going on
But on my post Little China inverter board tells all about what to do to eliminate the problem
Congratulation on your new addition to the family
I'm going to try my best to get a video tomorrow of what my little 4 mosfet 29 dollar inverter will do and upload it to YouTube
It might be very comparable to your high frequency inverter and it probably don't take up any more space than your high frequency one
Come on and build you a inverter
Very addictive it won't get you into any trouble it's a good hobby
And everyone needs a backupbe warned i am good parrot but Dumber than a box of rocks
tinyt Guru Joined: 12/11/2017 Location: United StatesPosts: 438
Posted: 02:22pm 04 Jul 2019
Copy link to clipboard
Print this post
Hi stockleys,
In the pictures you posted, I cannot read the capacitance and voltage ratings of the two large electrolytic capacitors. Do you remember them?
I am assuming they are the output filters of the DC-DC. Maybe if you can connect more capacitors in parallel, load surge current capability can be improved.Edited by tinyt 2019-07-06
stockleys Regular Member Joined: 21/06/2019 Location: United KingdomPosts: 54
Posted: 06:53pm 04 Jul 2019
Copy link to clipboard
Print this post
I can’t remember the railing of them. Inverteris mounted and running with the lid on now. But yes the 2 large caps are the dc-dc filter (I think)
When funds permit, I am really considering building a of inverter now
Strange problem appeared today. We had an apaintment at the doctors, came home after 2 hours and the inverter has shut down. Switched off and back on. Fine. Went out to work, came back a few hours later and it was off again. I should really have looked inside for the fault code. But it can’t be over current as all that was running was a fridge (70w). An fm radio (35w) and an air filter (15w)
Batteries were full according to battery monitor
Couldn’t have been over temp as I have made sure the fans work. It’s never been above 42 degrees.
Before it happens again and I have a look at the code light, has anyone any ideas?
Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904
Posted: 10:06am 05 Jul 2019
Copy link to clipboard
Print this post
Fridge startup current?
Back in the days when I had a 24V system and was running two fridges all was fine until the (rare) event of both fridges starting up at the same time occurred. Inverters usually have an over current shut down. Klaus
tinyt Guru Joined: 12/11/2017 Location: United StatesPosts: 438
Posted: 05:22pm 05 Jul 2019
Copy link to clipboard
Print this post
Maybe it got attached to you after you performed surgery on it and will not fail if you are around. Just kidding!
Seriously, I am assuming that the fault code is indicated by the EGS002 led. If it happens again, prior to recycling power, cover it and yourself with a thick and dark blanket so that you can see whatever led flashing light that leaks thru the vent holes of the cover. Similar to what photographers of the late 1800 early 1900 do. Also, maybe the video camera of cell phones are more sensitive to the led light than the human eye.
Just thinking out of the box.
stockleys Regular Member Joined: 21/06/2019 Location: United KingdomPosts: 54
Posted: 06:32pm 05 Jul 2019
Copy link to clipboard
Print this post
Came home today to find it shut down again. No led light on the egs002. Took the lid off without switching off. It appears the pwm board for the dc-dc side had sh*t down (the egs is powered by a secondary winding on one of the hf transformer)
It ran all night and all day. Went out at 1pm, came back at 7pm. It was off. It couldn’t have been low battery because it was only running small loads. And being topped up by 800w of solar
The only thing I can think, but can’t prove, is that my charge controller allowed the batteries to hit 15v (I hope not). I k ow this inverter shuts down if it hits 15v.
stockleys Regular Member Joined: 21/06/2019 Location: United KingdomPosts: 54
Posted: 06:34pm 05 Jul 2019
Copy link to clipboard
Print this post
Fridge start up is about 900watts. One and only fridge connected to it. Don’t have the space for a second as much as I would like another.
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 07:49pm 05 Jul 2019
Copy link to clipboard
Print this post
I had a really nice high frequency inverter the best I've ever seen ran air conditioners power tools anyting hooked up to it
it was supposed to be a 10,000 watt I'm sure it was more like five or six
Real nice aluminum case so i took all the high-frequency guts out of it and put a $29 low-frequency board in it
I did modify the board I did exactly what poida the Great told me to do
I put a higher amperage mosfet in it build up the traces and put Giant capacitors in it also
And I have not regretted it yet been using it for quite a while nowEdited by BenandAmber 2019-07-07be warned i am good parrot but Dumber than a box of rocks
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 07:56pm 05 Jul 2019
Copy link to clipboard
Print this post
Seriously I every video I've seen on YouTube and watched over the years
Everything I've read people mess with high frequency inverters for quite a while until they get so sick of them
Then they get them a low frequency inverter
Only exception is this mpp solar inverter
And I haven't kept up with it so they may have changed over to low-frequency tobe warned i am good parrot but Dumber than a box of rocks
LadyN Guru Joined: 26/01/2019 Location: United StatesPosts: 408
Posted: 08:05pm 05 Jul 2019
Copy link to clipboard
Print this post
Which one?
That's right!
Unless the person does not want to be handy and fix the broken inverter, in which case the freq. does not matter.
There's a classmate of ours whose father is a very successful local businessman. He buys a lawnmower every season because he does not want to deal with tinkering it to get it running back again after being in storage.
So he sells the mower once hes done with it and buys a new one when he needs it.
When I ran the numbers it did not make sense to me until she explained to me what the mowing companies charge to mow lawns.
Taking that into account, he was only spending around ~$100 more than if he had taken care of the mower.
I don't think he cares about $100 once a year. $100 is a LOT of money to me though!
BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961
Posted: 08:09pm 05 Jul 2019
Copy link to clipboard
Print this post
Yep there's a mowing company that does the same thing down here and they just take the riding mowers 2 the recycling center after they're done with them
Still look and run like brand new
You would not believe what comes to the recycling center
just crazy stuff like batteries that's only four months when the company you putting all the gas lines in left town
cheaper for them to recycle them to load it up and haul it with them
I have a big valve 14 in butterfly valve don't know what I'm going to do with it but I wasn't about to see it being recycled so I bought it
Maybe one day I'll make a pumpkin chunker or it would make a good valve for big farm pondEdited by BenandAmber 2019-07-07be warned i am good parrot but Dumber than a box of rocks
LadyN Guru Joined: 26/01/2019 Location: United StatesPosts: 408
Posted: 08:28pm 05 Jul 2019
Copy link to clipboard
Print this post
My brothers have been going around recycling centers over the last few months for me and all they send pictures of are solar panels, appliances and industrial items like big metal boxes, chains, etc
No batteries, transformers, or the fun stuff!
I had asked my brother to meet you guys before and he's planning to make time. Maybe all of you can go on a recycling center trip then!
stockleys Regular Member Joined: 21/06/2019 Location: United KingdomPosts: 54
Posted: 11:01pm 06 Jul 2019
Copy link to clipboard
Print this post
ok so it didnt shut down today :D
next niggle. warm cables and voltage drop
from the battery bank, i have less than 1 meter of 50mm2 cable. positive feeds into a fuse box 1x 300a mega fuse and 4 midi fuses (solar/wind controllers)
neutral goes into a 300a buss bar.
the 300a fuse gets a little warm when i run the kettle (1900w drawn from battery) but the cable from the fuse to inverter (50mm2) the lugs on the end hit 38 degrees c.
the neutral lugs dont get show any change in temperature.
all lugs were made off with a hydraulic crimper. all connections are done up as light as is sensible (without bending anything)
whats going on? any ideas? the cable is rated for 340 odd amps. but im pulling less than 200 amps.
yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166
Posted: 02:10am 07 Jul 2019
Copy link to clipboard
Print this post
98% of the repair work I do is bad connection joints or high resistance. if you get a heavy load on the cable you can probe around the joint with both of the multimeter probes and see the voltage differential (drop) point to point. you might have to file something flat, remove some oxidation, replace a bolt or washer or recrimp fittings.
maybe your cutout problem is overvolt protection, some inverters have a 14.7-14.8 volt limit, equalisation can push the battery voltage beyond that. edit : typo...again Edited by yahoo2 2019-07-08 I'm confused, no wait... maybe I'm not...
Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498
Posted: 02:16am 07 Jul 2019
Copy link to clipboard
Print this post
How far is your battery voltage sagging with the huge currents involved? You would need a very large battery capacity.There are only 10 types of people in the world: those who understand binary, and those who don't.
stockleys Regular Member Joined: 21/06/2019 Location: United KingdomPosts: 54
Posted: 02:20am 07 Jul 2019
Copy link to clipboard
Print this post
my charge controller does not have equalization im using agm batteries aswell so it wouldnt be good for them.
all cables, lugs, fuse box was brand new for this setup. i might uprate to 70mm2.
and possibly uprate the size of cable inside the inverter 2x 6mm2 positiver, 2x 6mm2 negative. per transformer the voltage drop between battery and inverter on the negative, under load from the kettle is 22mv. positive has a drop of 96mv. most of which is between the fuse and inverter terminal.
like i say, its only the link between fuse and inverter that heats up. all lugs were bought at the same time, and the short positive link was cut from the same cable as the cable from battery to fuse.
i know the fuse is going to have some voltage drop. the manufacturer even specifies a given drop per 100amp. im kinda thinking, uprate to 70mm2 and fuse using 2x 150amp rather than 1 300a fuse.
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.
Print this post
I still don’t know why the originals failed after switching it off in the first place. But everything on the dc-A.C. side is new now. So fingers crossed. I’m now not going to switch it off unless absolutely necessary 
) we may be able to get a bigger place. only down side is, out garden is south facing and gets direct sun from 7:30am till 9pm (this time of year) so im getting over 13 hours of direct sun to my solar panels. not many gardens around here can boast that due to the density of other buildings.
