Going Off-Grid.. AC / DC Coupling - What, How, Why - A Plan?

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Re: Going Off-Grid.. AC / DC Coupling - What, How, Why - A Plan?

Postby Gordon-Loomberah » Wed Aug 21, 2013 4:10 pm

davidg wrote:Where are you (FJ) in NSW in relation to "Hay, NSW"?


A very long way away, see: introductions/topic5259.html
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Re: Going Off-Grid.. AC / DC Coupling - What, How, Why - A Plan?

Postby davidg » Wed Aug 21, 2013 5:30 pm

Gordon-Loomberah wrote:A very long way away, see: introductions/topic5259.html

Yeh well that maybe but I don't live in NSW. :?
I'm in Vic hence my lack of knowledge question however once I looked it up, it's only about 500km's from Hay :lol:
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Re: Going Off-Grid.. AC / DC Coupling - What, How, Why - A Plan?

Postby LeighC » Wed Aug 21, 2013 6:14 pm

Hello Gents,
I have had an older style Rich Combi Invertek 3in1 PSW 1500 Watt Inverter/UPS/50amp charger/30amp solar regulator for 7 years with no problems, it works well in the heat & is fully programmable & is well made & lives up to its specs well. They are a fairly old company & make industry quality AC motor speed controllers.
They seem to be rebadged and sold under a few other names.
I have no affiliations with the company, just stating what I have experienced.
Cheers - Leigh
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Rich Electric Inverters

Postby Tracker » Thu Aug 22, 2013 7:41 am

.
LeighC wrote:I have had an older style Rich Combi Invertek 3in1 PSW 1500 Watt Inverter/UPS/50amp charger/30amp solar regulator for 7 years with no problems

That is good to hear... and given the quiet presence of the product in the market place, and the existence of these forums, this suggests that their technology must be pretty stable..

The thing that I find interesting, is that the technology seems to have been around for a good time, and has been almost ignored.. Perhaps, now that the whole concept and demand, is more topical, we might hear more of the option...
..
.
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Different ways of developing HYBRID powered systems

Postby Tracker » Sat Nov 09, 2013 7:02 am

.
Just curious if new folk have descriptions of how THEY have developed their off/on-grid and hybrid power alternatives ..
..
.
Retired Engineer and keen PV experimenter - Always ready to learn and share.
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Re: Going Off-Grid.. AC / DC Coupling - What, How, Why - A P

Postby MasterCATZ » Sat Nov 09, 2013 8:26 am

Tracker wrote:..


KOGAN showed that they could sell a mobile phone service at a fair price, and the BIG boys did not like the loss of business/profit - and so cut them off.... Now, NO cheap phone plan..

..
.

+1 to that i enjoyed my yearly unlimited plan
back to switching my phone's off again

I went with the Yatango promo kogan gave us on a PAYG plan,
I draw my line at $1 a day unlimited Aldi didn't have unlimited at the right price
( unlimited should be data sms and calls )

Tracker wrote:.
Just curious if new folk have descriptions of how THEY have developed their off/on-grid and hybrid power alternatives ..
..
.

+1

wanting to off grid the house so the FIT solar system can export all power it generates
Last edited by MasterCATZ on Sat Nov 09, 2013 8:41 am, edited 3 times in total.
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Re: Going Off-Grid.. AC / DC Coupling - What, How, Why - A P

Postby davidg » Sat Nov 09, 2013 8:34 am

MasterCATZ wrote:+1 to that i enjoyed my yearly unlimited plan, back to switching my phone's off again

ALDI plan now, they survived that Telstra debacle, but they are a little bigger.

https://www.aldimobile.com.au/
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Re: Going Off-Grid.. AC / DC Coupling - What, How, Why - A P

Postby Tracker » Sat Nov 09, 2013 8:53 am

davidg wrote:....ALDI plan now, ....


OT - but us also..

365Days to use your credit... Pay as you go.... $15 a month for DATA..
It's costing us LESS that the 365 Kogan plan...
(Kogan crapped in their Telstra nest - winning a battle and losing the war)

but we are no longer free and easy with the mobile phone use.

THIS is likely good as mobile phones cause proven brain cancer.. :twisted:
..
.
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Re: Going Off-Grid.. AC / DC Coupling - What, How, Why - A P

Postby davidg » Sat Nov 09, 2013 9:01 am

Tracker wrote:OT - but us also.. 365Days to use your credit... Pay as you go.... $15 a month for DATA..
It's costing us LESS that the 365 Kogan plan... (Kogan crapped in their Telstra nest - winning a battle and losing the war)


https://www.aldimobile.com.au/plans#unlimited

I'm still using my Redbull mobile plan it runs out in early in the new year (No Longer Available)
It was $365.00 P.Yr. unlimited calls & TXT and 5Gb of data, worked out well.

Only drawback was no service in serious rural Vic/SA. Got Telstra mobile for that (on el-cheappo plan ), so no matter.
SPS Standalone Power System/Hybrid specialist - Store the Sun!
SELECTRONIC SPMC482-AU, 8.2kW's of Arrays
Selectronic Certified AC-Coupled Fronius 8.2kW Inverter
1900Ah 48V Bank

An OTT Genset for a house.
PVOutput Stats

Sparkys light up your life :)
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Re: Different ways of developing HYBRID powered systems

Postby Warpspeed » Sat Jan 04, 2014 9:43 am

Tracker wrote:.
Just curious if new folk have descriptions of how THEY have developed their off/on-grid and hybrid power alternatives ....
.

Well I am new....
And I have been thinking this exact problem through for quite some time.

My situation is different to many of you, I live in suburban Melbourne, am on grid, wish to reduce my power bills a bit (?) and eventually my total reliance on the power utility. And I don't have a fortune to spend.

So I have a few off the wall DIY ideas I am developing right now.
This will all be completely original home brew electronics, no commercial black boxes.
The idea is an ultra low cost "solar assisted" system that adds power when the sun shines.
There are no plans to have a battery or to feed power back into the grid, altough a battery may come much later.

If I can power my refrigerator and computer from sunshine, that should cut my kWh by a hopefully third during the summer months.

The grand plan is to first rectify the incoming 240 volts to generate roughly +340 volts and -340 volts on a fairly large capacitor bank.
Then fit a PWM true sinewave inverter to that, to reconstitute something slightly lower than 240 volts, maybe about 230 volts after all the conduction losses are taken into account.
The inverter will be made powerful enough to run just about anything, and safely supply surge and fault currents, low power factor loads, and have adequate very fast overload protection.
Suitable low pass filtering should attenuate the PWM and any EMI problems.

The idea is to then feed solar power when available, as a high dc voltage, into the capacitor bank from a voltage converter.
If the capacitor bank voltage is raised above peak mains voltage to perhaps +360 and -360 volts, the diodes in the mains rectifier will never conduct. All the power will come from the dc voltage converter supplied by the solar panels.

This will probably be only a very few hundred watts initially, but enough to run my refrigerator and computer.
If a much higher load is suddenly applied, such as the starting current for the refrigerator, the voltage on the capacitor bank will be pulled down, and power will come from the grid.
A huge overload will just pull the solar panel voltage down without any fear of overloading the voltage converter, no current limiting should be needed.

Lighter loads will all come from solar, if/when solar is available.
This means I might only need say 400 watts of panels, and a 400 watt 24/360+360 volt voltage converter, to run my 90 watt computer and my 130 watt refrigerator. It does not sound like much power, but it would contribute over 1kwh daily load which is a significant portion of my total.

The whole philosopy is to do it on the cheap and get best bang for my buck, as well as the technical challenge.

Later I may add a fork lift battery and high power voltage converter to kick in if there is total mains failure.
This can be arranged as a UPS by supplying dc power to the capacitor bank at a voltage slightly lower than +340 and -340 volts. All the rectifier diodes in the system determine where the power comes from, without any coflict or need to switch anything.

This is a gradual long term project that can be slowly upgraded and added to. No point in spending hugely for small savings. It will be upgraded or modified over time as experience with it suggests.
The main aim is to keep it very simple, very low cost, and reliable.
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