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91
Oztules / Re: guess who bought a power jack inverter
« Last post by elajambejr on March 16, 2017, 11:10:56 AM »
I purchased one the these Power Jack inverter (8000w 240v version) about a year ago and I have to say for the money I'm quite pleased. Runs 1500w with room to spare for a fridge or something to startup at the same time without any issue. The one serious drawback is the standby load which I'd like to fix before I take it off grid.

I'm running a split phase 240v 12v version of the Power Jack which have two invertors so I assume I need to choke both sides legs of transformer, correct? Also, could you suggest what size, type, etc. of choke I'd need to build? I know some about electronics but not nearly enough to tackle to figuring out what size of choke I need?

Thanks in advance.
92
Renewable Energy Q&A / Re: Your Battery Bank Type ? -Poll 2012-
« Last post by lighthunter on March 16, 2017, 01:24:42 AM »
 ;D. You got me, I didnt even look at date.
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Renewable Energy Q&A / Re: Your Battery Bank Type? -Poll-
« Last post by WooferHound on March 15, 2017, 11:04:33 AM »
Well . . . it is a February 2012 poll
Perhaps I should create a new one . . .
94
Did anybody else see the IEEE published report on the accuracy of current model smart meters when subjected to modern load profiles generated by standby household equipment?

It makes you wonder how the bill from <insert: Power Company> is calculated since the power meters clearly are off the planet when measuring current waveforms with large amounts of high frequency components.

The University of Twente and the Amsterdam University of Applied Sciences have published a paper demonstrating gross overbillings by smart energy meters, ranging from -32% to +582% of actual power consumption.
They tested about 12 meters, including ones that look a bit like those found here in AUS.

"Experiments went on for six months, with individual tests lasting at least one week, and sometimes several weeks. Researchers tried to reproduce regular household energy consumption patterns and didn't focus on putting the smart meters to stressful conditions." according to the bleepingcomputer.com article.

I find it beyond belief how much error AC power measurements can have.

Since it's an IEEE paper, you need an account to download it from them.
Additionally, since it was published in IEEE Electromagnetic Compatibility Magazine this means it is peer reviewed
and so has a very low B$ content.

Look at this link where you can find a link within to Sci-Hub's copy of the paper. To download from there, you need to install the Tor browser.
http://boingboing.net/2017/03/11/unaccountable-algorithms.html
or
https://www.bleepingcomputer.com/news/hardware/millions-of-smart-meters-may-over-inflate-readings-by-up-to-600-percent/
for another summary.

Fair use quotes from the document:
"Controlled experiments performed on static energy meters confirm that they can present still faulty, and substantially higher, readings. The main cause of interference appears to be the current sensor.Meters with  a Rogowski coil current sensor showed a positive deviation of 276%, or an increased reading of 376%, using a controlled power supply with undistorted voltage and defined impedance, compared to the reading of a conventional electromechanical meter based on the Ferraris principle. Meters with a Hall sensor showed a deviation of registered energy of -46%, or a decrease in energy reading to 54%.
Using the mains supply in the laboratory, from 9 static meters 5 showed positive deviations of up to 582%, which is a higher energy reading of 682%, and 2 showed deviations of around -30%, equivalent to a reading of 68%."
95
Wiring and Code discussion / Re: A small SAPS - DC Earthing/Bonding/Fault Protection
« Last post by OTG on March 15, 2017, 12:32:12 AM »
Thanks for the reply fellas.

I'll leave the PJ chassis earth alone.

I shared your sentiments re DC/AC bonding welshman, but I've seen schematics like those linked below which appear to do so and I wondered if I was missing something. Can anybody explain the DC side of these...?

https://www.homepower.com/sites/default/files/articles/ajax/docs/7_HP136_pg78_Munro-5.jpg
https://www.homepower.com/sites/default/files/articles/13336/docs/167-34-SindelarTinySkiz.jpg

Can you give an example of something on the DC side that can cause input overloads? Other then PV gone-wrong I cant think of anything else... I wont be charging with a generator either.

Why bond AC Earth/Neutral at the PJ Mainboard - as opposed to using a MEN link in the AC Dist Panel?
I assume to bond at the Mainboard is simply a matter of a short length of wire with ring terminals linking the AC -/Earth screw down terminals? My intent was to use an RCBO with MEN in the AC Dist Panel.

And yes I've heard some generator horror stories... yours had -/Earth bonded but no inbuilt RCBO? Far from ideal...  :P

Finally I couldn't agree more Oz - I'd love to go with a SBP! I'm a yuge fan of DC 'appliances' - fridge/freezer, lighting, love my DC MIG Ready Wedler!, etc.

But... the bore has an existing 240v pump which is doing the job, and I've already got the batteries/panels/inverter - so it's just the BoS bits and I'm done (more affordable for me in the short term at least). Plus 240AC will probably come in handy running transfer pumps, mowing the grass around the tank/bore, and maybe pumping from a nearby dam. So I figured I'd just go with a SAPS setup.

I'm curious about the bores on Flinders now - is the water brackish or does the strata (limestone?) prevent salt water ingress?

I must admit though, my innner Bill Mollison cringed at the thought of turning ground water into surface water... it's too precious a resource round my neck of the woods!  ;D
96
Renewable Energy Q&A / Re: Your Battery Bank Type? -Poll-
« Last post by lighthunter on March 14, 2017, 08:24:32 PM »
Correct me if I'm wrong but i think SLA refers to both gel and and agm. Dont know if you could edit that and delete sla giving those numbers split between agm and gel. Also, i agree with rossw, you need LFP in there, They are gaining popularity and again without it as a choice some are throwing their LFP vote in the li ion bin. Great information though, thanks!
97
Automation, Controls, Inverters, MPPT, etc / Re: 3 Phase inverter EG8030 EGS031
« Last post by Mulver on March 14, 2017, 04:04:19 AM »
Hey Roberto
I'm a noobie to this field but I've done a fair bit of reading over the last few months, Im also pretty keen on building a 3 phase inverter using the EG8030 chip as I have not seen cost effective single phase to three phase inverters over 3kw.

We have some  3 phase 10kw plus motors on a dairy farm, Id like to think in future i could build a battery/inverter/grid tie solar system to run these beasts, they would only be started knowing there is going to be enough solar coming in to take the bulk of the load.

After building my first Oztules/Clockmans Single Phase inverter.
My plan of attack would be to wind 3 toroids, build 3 of Oztules/Clockmans power boards, study and understand the latest OZ/Clocks Control board, then re engineer i new control board with the EG8030 chip. From the drawings I have studied it looks identical to the EG8010 just has 3 of almost everything.

Then test, test, test. That would be my cheats way to get to a 3 phase inverter.  ;D

So my advice to you read everything and anything on the Ozinverter!!!

Cheers Shane
98
Automation, Controls, Inverters, MPPT, etc / Re: 3 Phase inverter EG8030 EGS031
« Last post by frackers on March 14, 2017, 03:54:32 AM »
I've decided to avoid the 3-phase issue altogether and replace the pump with a single phase one since what I have is 15 years old and the debris from the last series of earthquakes likely did it no good at all!

A mate is in the irrigation business and he has a nice solution that uses a flow meter integrated into the headworks from the bore hole to determine when to run - it tries and if it find no flow then it shuts off again!!

Also means that I avoid all the hassle of probe relays in the tank (just had one fail a few weeks ago and spares are not available so had to reposition the tank empty into the tank fill)  and just use a differential ballcock.

Still no new shed (costs are spiraling) but hope to move onwards again in a few weeks.

99
Automation, Controls, Inverters, MPPT, etc / Re: 3 Phase inverter EG8030 EGS031
« Last post by robmar on March 14, 2017, 02:03:26 AM »
Hi all,
needing an inverter capable of supplying pure sine 3-phase 380V 50Hz from either a DC source or AC single phase as well, I came across the EGS031 and companion board EGP3000W on one of the many marketplaces around.
I've gathered all the relevant schematic and datsheets (pity that most of them are written in Chinese, but this is when Google translator came handy...), ordered the boards, started sourcing components and got myself a custom made 3-phase transformer.
But soon I realized that, despite the fact that a good number of boards (judging from seller's statistics) have been sold, there's no trace around of someone having actually built the 3-phase inverter and willing to share his experience.
Soon after, looking around for further infos / hints I came across this site, and found some competent and active posters although this thread looks deserted from a while.
So, hoping that interest in this subject is still alive, and that, maybe, someone else embarked the adventure of building one or at least is planning to, I'm dusting off this thread, hoping to find some enthusiast to share ideas / doubts about this project.
My priority is to fully understand the right jumper configuration on EGS031 board. While some are obvious, other are not and having not yet completed the circuits, I look forward to get off on the right foot and avoid building a smoke generator  ;D

... Anyone answering the call ?

Greetings from Italy,
Roberto
100
This is not what you want to hear..... but this is no way to efficiently pump water in an agricultural setting.

The are now plenty of solar bore pumps that will easily overshadow your current wish system. Only require panels, controller, and three phase BLDC pump.. preferably screw type.......

And they are now cheap on ebay, and easily run 600 cows.

eg...http://www.ebay.com.au/itm/4-1000W-110V-Screw-Submersible-Solar-Bore-Pump-Free-delivery-/142290793451?hash=item21213133eb:g:qxEAAOSw2gxYsCQh

http://www.ebay.com.au/itm/4-2200W-156V-SUBMERSIBLE-SOLAR-WATER-BORE-WATER-PUMP-SYSTEM-Auto-Control-/182441827467?hash=item2a7a615c8b:g:0YwAAOSwiDFYNzNH

There are a few on the island now..... unbelievable performance.
You need a very different reason to use battery now days that brushless units are common.
One of those units pumps into a 120psi head@ over 30lpm, and fills a man made dam.

Just in case you had missed these developments.

For earthing I think Welshman is close enough.

.....oztules
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