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Forum Index : Electronics : 6Kw Ozinverter build
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renewableMark Guru  Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
They probably regret it though when they get home.  Ohh the whining...... ohhh the bitching.... Oh the bloody "I have a headache" Sometimes work is like a holiday. Cheers Caveman Mark Off grid eastern Melb |
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Ralph2k6 Senior Member  Joined: 24/09/2017 Location: AustraliaPosts: 129 |
I'll second that! Ralph |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Hey guys just looking into a dc meter. I found this The ad said do not place near large transformer hahahhahahahamwhaaaa. Seriously though how close will it root the accuracy of this? & is it smarter to just get a shunt&meter? this was the other option. Or this Cheers Caveman Mark Off grid eastern Melb |
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| Ralph2k6 Senior Member Joined: 24/09/2017 Location: AustraliaPosts: 129 |
This is a previous link from clockmanfr. Would be quite neat I think. Try this Have not got one myself but would be on my list. Ralph |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Thanks Ralph/Clockman, I hadn't thought about a wireless one, that's a ripper. Link came out funny on the desktop here it is again. You could use one like this on the inverter as it's 75mv too and put the wireless one in the house Cheers Caveman Mark Off grid eastern Melb |
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Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Mark you may find this interesting, Thursday, Friday and Saturday were dark rainy days and we only got enough charge to bring the battery back up 13, 10 and 9 % on each of those days. Yesterday (Sunday) was periods of rain, showers, and sun, the battery regained 43%. We normally drawdown around 20% each night from the 775AH battery the same as the one you are looking at. During this time at the lowest, the battery was down to 48.4V. This was the biggest drawdown I have had, it has been down to the mid 60's a couple times and back to full charge the next or following day. The point of this post is that it is working as it should and I am very happy with the results of this secondhand forklift battery (that is refurbished with a 2 year warranty). In normal use these batteries are designed to draw down to 20% every day, this would result in a much shorter lifespan though.  There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Thanks Mad, funny you posted that I just spoke to them. They don't have any stock ATM, but don't need it for prob 6 weeks anyway. What is that monitoring programme you have there? I was going to make one of these for backup power. Probably keep the grid connection for the first winter and use the changeover switch if needed and after a successful winter run, then just disconnect the mains altogether. With an av of 10kwhr a day I think we'll be fine. I also have a pure sine 4.5kva petrol gen. I have one of these on the way too, if I'm happy with it I'll get a second one, or maybe think about using the aurora for the east side (16 panels) Cheers Caveman Mark Off grid eastern Melb |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Those charts are from my Midnite charge controllers that have an online monitoring website. You can use a couple >$100 chinese inverter welders with very minimal modification as chargers. More details here. I have one that is working but I need to spend a bit more time on it to get it working properly. Another method is to rectify the output of the generator and feed that into the PV input of a GTI which will then charge your battery via the inverter. If I had the option now I would go a bit bigger but the 775AH is doing a good job. How are you progressing with the primary?? There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Yeah, I'll have a go at the recycled, had an eye problem and couldn't see too well fixed now. Need to catch up on work. Might get some time tomorrow. Cheers Caveman Mark Off grid eastern Melb |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Let me guess you were blind drunk  There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
I'm just thinking that cordless one may be a pain as it needs a 5v power supply. this one looks good too and has a programmable relay action that could be used as a low voltage disconnect. How does that one look? Cheers Caveman Mark Off grid eastern Melb |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Haha jeez you're getting to know me too bloody well. Nah I copped conjunctivitis, like most fellas I said it would just go away but Noooooo my eye went like a tennis ball, couldn't drive, nothing. Bugger, got some drops and all better in 36 hrs. Wife says men are stubborn. Cheers Caveman Mark Off grid eastern Melb |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
That one needs a power supply of less than 40V also but you could use your 12V fan power supply. You don't need to monitor the DC current constantly, a DC clamp meter is useful and would allow you to check DC current as required. I have one of these I bought from Super Cheap Auto but they don't stock them anymore. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
I got one of them from super crap only 4-6 weeks ago. Reckon for the sake of a handful of $ it's worth having a fixed meter. And that relay trip off would be good, perhaps have two methods for LVD though in case one rooted itself, things have a habit of doing that at the EXACT time when you need them. "F" Now I need to find a bloody big relay. Cheers Caveman Mark Off grid eastern Melb |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
I bought one identical off aliexpress, and I must say I was impressed by its accuracy, both at low currents (my spotlights draw 14A according to the Fluke, and it was reading only 200mA higher!) It seems quite accurate at higher currents, less than an amp out using the fluke and a 100A shunt on my alternator, cant test it up higher I would keep it away from transformers while measuring using the clamp, I discovered it didnt like being near my starter motor, wildly fluctuating readings, but connecting it up near the battery gave solid readings that didnt fluctuate- I assume the magnetic field from the starter motor was interfering with the clamps ability to measure the current |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
 Hi Mad, thanks for posting that layout pic, I replied here as I didn't want to hijack and mess another thread. When you mount the toroid side on does it need a support? No one seems to do it, so I assume the answer is no, but it doesn't seem quite right. The aero sharp is potted with epoxy, I assume people are reluctant to do this as it will affect cooling, I'm also concerned as to how the weight unevenly distributed with a few hot summers how it will affect the windings, both primary and secondary (without being potted). Cheers Caveman Mark Off grid eastern Melb |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Something you need to not forget, if you put a support bar or similar across there and bolt it all together you will create a single short circuit turn in the Toroid. That will result in lots of tears. Apart from that it is simply not needed. I had to remove the original bolt and move it a little towards the centre of the case to allow room for everything. I got one of the epoxy inserts and ground off some of the more bumpy bits put a 10MM bolt through it and put one of those nuts about 50 MM long on it and tightened it down. The top half is another epoxy insert with a washer and bolt in it screwing into the long bolt. The Aerosharp cases are 2mm thick and are very rigid, there is no way that toroid is going anywhere. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
I knew there was a reason I wasn't an electrical engineer.  Cheers Caveman Mark Off grid eastern Melb |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
If you needed extra support for some reason like a thin case, using a piece of plex or even a pvc conduit flattened out at the end would do Just not anything conductive as that would be a shorted turn yeah lol |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Thanks Boppa, I'm going to use the Aero sharp cases, so apparently, nothing to worry about. When the new bolt goes in possibly put a steel strip on the back outside where the bolt head goes and weld that to spread the load and strengthen it up. And yeah maybe a thick bit of perspex on the front. Cheers Cheers Caveman Mark Off grid eastern Melb |
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