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yahoo2
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Posted: 11 September 2017 at 1:53pm | IP Logged Quote yahoo2




This graph shows the best system I can build, operated to perfection, the front row is what it costs in CASH, the back row is TOTAL COST of OWNERSHIP, finance, tax, everything.

So any off-grid solar system (red) not hitting the sweet spot will cost more than 24 cents/kwh.

The ongrid solar with diversion loads (light blue) can achieve under 16 cents at a range of installed solar capacities.

The average person buying new off the shelf (not custom build) can add up to 10 cents to my on-grid battery and off-grid prices.

I wrote that last post this morning and made sure my sources were good, and when I switched the radio on tonight all hell had broken loose, with personal threats against AGL from the govt, I kinda wish I had put it on a blog rather than here now. Supporting Liddel power station will destroy the financial incentives for installing new generation, I have read the AEMO report, it basically says that nothing needs to be done, as NSW will have four times the power it needs to replace Liddel installed by 2022.

The point I am trying to make is no homeowner should feel guilty about not pulling their weight or shamed into saving electricity for dubious reasons.

We shouldn't feel forced to install expensive battery systems for the good of the country or to protect ourselves from very unlikely power cuts. No-one should bear capital costs that are unnecessary.

We have done enough, and the numbers bear that out,
Australia's households generate more electricity than they use when it really matters

South Australia has a goal of being net zero emissions by 2050.


Households as a group are already there. It is someone else's turn to step up.



Edited by yahoo2 on 11 September 2017 at 2:44pm


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pancho 43
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Posted: 14 September 2017 at 7:08am | IP Logged Quote pancho 43

I live near the Qld border (Brunswick Heads) and have two solar systems both 5.4KW.
The first was installed Dec 24 2010 at a cost of almost 24K. It has 24 225 watt Mitsubishi panels with 5KW SMA inverter. It has now produced almost 54,000 KWH and paid itself off in the first four years. The second system was fitted 23rd Nov last year and has so far produced over 6,400 KWH. It has 20 270 watt Jinco panels and 5 KW Growatt inverter. This system was $6,100 with 3 phase smart meter.
I installed the second system in preparation for going completely off-grid, thinking that I would have plenty of charging for those dull short winter days when it's raining.
Since Enova started up and paying the (previously) 12c FIT I changed from powershop to them and I've only had one bill from them. That was while it was only on the 12c FIT and to my surprise My bill was to the credit of $334.00.
I'm now looking forward to the next one to see how I go now I'm getting the 16c FIT.
I have a Granny-flat attached to my house and recently had the meters removed to alleviate the extra service availability charges. I told the Tenant that if he continues to be careful with his consumtion I will not be giving him a bill, so he's saving all the way around.
And so am I with the FIT and plenty of panels it looks at present as if things go as they are, I will not have to go to the expense of needing batteries and their replacement costs. The total average usage (after meter) has so far been around 6KWH/day for both households with solar hot water and the pool-pump etc. on timers for strong daylight use only.
Happy chappie whose not had to pay for power since Dec 2010 admittedly at some expense.

Cheers, Pete.

Edited by pancho 43 on 14 September 2017 at 7:12am
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Posted: 18 September 2017 at 8:40am | IP Logged Quote yahoo2

Welcome Pete, that's what we like to hear! Rooftop solar working as it is supposed to.

Further to my post about how much solar is actually being produced. Audrey Zibelman (AEMO head honcho) and quite a few commentators have pointed out the same thing.




S.A. grid demand plunges to record low as rooftop solar share hits 48%

The interesting think about this graph is that the interconnector had a little hissy fit early in the morning and the price of electricity went negative (black line). So in theory you could be paid $44/MWh to use or store electricity, provided you could participate in the wholesale market. This is one of the reasons I am keen to see brokers services happening so that small players can get a slice of this. Over that 40 minutes I would have been paid 50 cents to receive 12 kwh.

That brings up the point of how pivotal that interconnector links are at the moment with no energy storage in the mix, today every state was exporting electricity that ultimately ended up in NSW.
I do worry that new generators are accepting 20 year fixed price contracts to get their finance rather than being fully funded and participating more in the market. I think that loss of marketing flexibility will mean opportunities to take advantage of fluctuating prices may be left to only a few entities.







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Madness
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Posted: 18 September 2017 at 10:58am | IP Logged Quote Madness

Roof top solar exceeding demand, the sky will fall down!

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Alastair
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Posted: 30 September 2017 at 8:31pm | IP Logged Quote Alastair

Like most people I have recently been getting a few unsolicited phone calls offering me 'great deals' to change my energy provider. When I ask if they will give me better then half of the rate I pay for import power for my excess solar they quickly disappear.

I currently get 9c / KwH for my excess. I pay ~27c for most of my import. My meter shows that since we moved into our new house the 5Kw panels have generated 50% more than we have used. I think battery storage systems have now dropped ($) to the point I will start looking. A 10KwH system will comfortably handle all our needs except when we need to run the big 3-phase a/c. Since we live near the ocean it is more when it is warm and humid rather than hot.

I was surprised when the electrician told me that 5Kw was the maximum panels we could install. I gather this is due to the risk of driving up the local grid voltage if too much solar capacity is installed. Definitely sounds like the grid control systems were not designed to handle local generation. We are still in the old times in many ways. We have spent a fortune on new poles and wires which has been the major factor driving up prices. We now need to update to take advantage of the abundant opportunity for renewables in this country (Aus). With our polies back in the coal era I won't hold my breath.
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Posted: 30 September 2017 at 9:37pm | IP Logged Quote Madness

Is that maximum of 5KW of panels or the inverter? You should be able to have 6KW plus of panels so long as you can't export more than 5KW.

If you have enough thermal mass in your home you could cool it more off solar during the day and still be cooler at night with the AC off. Have you tried running the AC on dehumidifying? Like yourself, I live not far from the coast and our maximum temperatures are not that high but combined with the humidity 32 degrees feels really hot.

The politicians are pushing coal because of who pulls the liberal party strings, power companies are not interested in building coal-fired power stations. Around the world, there are examples everywhere of renewable energy being installed because it makes financial sense.

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Alastair
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Posted: 30 September 2017 at 11:23pm | IP Logged Quote Alastair

5Kw of panels - the installer was happy to slip a few more on if I wanted. What we have is enough if we now put batteries in.

I am not paranoid about only using solar power. If it is hot i am happy to pay the power bill. In reality in the near 1 year we have been in the new house we have used the a/c more for heating when the cold southerlies blow. We now have a wood pile so can use the combustion stove. We use the big electric appliances - dishwasher, washing m/c etc, during the day when solar is good. The evacuated tube h/w system is great and I now have sensors on most parts so I can see what is happening. For winter we need more tubes, in summer we have more than enough. I estimate we spent ~$100 during the cool months for the electric booster when we had visitors. Again I think once the batteries are in we will make better use of the excess power and I won't expand the solar h/w.

I went to great effort to get the house well insulated and nagged the installers when I could see a gap they had not filled. They thought I was mad when I insulated the brick garage walls on the bottom level even after I pointed out that it was underneath the main living area which is on the upper floor. Had I not persisted I doubt it would have been done the way I wanted. The foreman got thoroughly sick of me but I pointed out that I paid the bills and would get what I wanted or find another builder. I am sure many houses are not as well insulated as claimed.

re the a/c - we rarely have the a/c on during the night and do as you suggest, turn it on during the day and use the thermal inertia by keeping the house closed up at night. At least with our net meter this cancels out some of the expensive electricity. Fortunately we can afford to be comfortable.



Edited by Alastair on 01 October 2017 at 1:30am
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Posted: 25 October 2017 at 7:44am | IP Logged Quote yahoo2

I had planned to do a feature on Peer to peer energy trading and how blockchain technology would make it possible to sell electricity directly to your neighbours.

However, the National Energy Guarantee has just been announced and I am honestly struggling to find enough detail to make any real meaningful sense of the implications.

It looks like the renewable energy certificates scheme will not be enforced from 2020, that would in theory make the large generation certificates worthless. Both in $ value and as a tool to motivate retailers to support the building of new cleaner electricity generation. The small scale technology certificate (STC) that we commonly call rooftop solar rebate feeds into this scheme and is aggregated by brokers and bundled into large generation certificates to be sold.

I am guessing that means it will be curtains for the STC. Instead of winding down slowly by 2032 it looks like the certificates will be at $0.00 before 2020 if the NEG goes ahead.

STC's as of today for 14 years on a 5kw system in zone 3 would be 96 certificates by $36 totaling $3456

Three and a half grand is a big dent in the upfront cost of grid connected clean energy council approved rooftop solar. The govt has gone to great lengths to spell out that this scheme IS NOT A REBATE but an industry funded mechanism, I cant see them funding the shortfall from 2020 to 2032 out of general revenue since there has been one attempt to axe the scheme already.

More troubling is this new idea of physical contracts for emissions and dispatch-ability and no financial penalty for falling short of emission targets. Rather than the existing financial mechanism that doesn't discriminate between companies and concentrates on the overall results.

The Idea that a big retailer would voluntarily purchase emission credits when they have no enforceable legal obligation to do so seems just farcical.
I have visions of smaller brokers being shut out of the retail market completely through bureaucratic red tape if a centralised body has the last word on who trades and who doesn't. If consumers get locked out of accessing the spot price for electricity it will be a disaster for the grid and a total bonanza for battery suppliers.

I guess I will have to nervously sit on my hands for a couple of weeks and see what happens with the COAG meeting. I really dont know where this is going. I wish there was some good news but to be honest, things look pretty bleak.


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Posted: 25 October 2017 at 8:16am | IP Logged Quote Madness

What an appropriate name "NEG" and is that the COAG or COAL meeting?

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