octave

actually 5 "Since the beginning of the vaccine rollout in Australia, a total of five deaths from TTS have been reported out of 6.1 million doses of the AstraZeneca vaccine. All of them were related to a first dose of the vaccine". https://www.tga.gov.au/periodic/covid-19-vaccine-weekly-safety-report-22-07-2021

I Another novelty contraption 😉

I am not sure exactly what your question is but I have just today been trawling through the details of my system. My system was installed in Feb 2020. My 2019 bill (before solar) for the full year was $1650, my full year bill (after solar) 2020 was $919 . To use one example I can see through my metering that on Jan 23 I used 5.7kWh (this is what I took from the grid) this cost me $2.61 (this includes the daily network fee) on that day I sold 24 kWh back to the grid which gave me a credit for $2.52 I have saved money im 2 ways. During the day I have been running my aircon without drawing from the grid until sundown. On this day the cost of my power was negative. Of course this does not happen every day although it is surprising that this even works on many winter days. With my power retailer I actually buy blocks of power in advance and when I have used most of it (however long that takes) I buy another one. Last time I bought a $270 block of power but because of my feedback credit it only cost me $97 I am not a zealot trying to convince anyone to go solar I am presenting the facts as they apply to me. You have to consider the payback period which for me is around 6 years.

How so? I am eager to learn. The one thing that can't be denied is that there has enthusiastic uptake by mining companies, are we in agreement on that point or not? So I think that where we differ is that you believe the mining companies are making poor decisions and adopting technology that is economically and poor being a little dishonest about it the economics of it, Is that your position? Many links I have posted are by mining industry sites not some green site or solar/battery company Renewables are a no brainer for the Australian mining sector In the end what does it matter, These companies are entitled to operate (within the law) however they like.

So this is an untruth?????? I would imagine that this information would be available to shareholders and certainly it would be a serious matter if the Chief Executive is actively making misleading statements. Rio Tinto is only one many mining companies investing in this technology. It is not just one company but many both in Australia and overseas. Mapping renewable energy projects at Australian mines It may well be that since you worked in the industry technology has advanced. When I installed my first rooftop solar back in 1990 a 60w panel cost $595. Today for $150 you can get a 350w panel. Back in 1990 $595 was a lot of money In an interview with RenewEconomy’s Energy Insiders podcast, Alinta Energy chief executive Jeff Dimery says the “rough payback of 4.5 years, which he says in an excellent payback for this type of asset. One of the great fallacy of the current energy debate is that only wind and solar energy need “back up”. This is complete nonsense. The Newman power station has four different gas turbines, two of which usually have to be run all the time as spinning reserve just as back-up for the other one or two that may be required to generate electricity. The presence of the battery means that spinning reserve is no longer required. Its speed of reaction and strength meant it could hold the grid together if the main turbine or turbine tripped, giving time for the other two to be fired up. This has significantly reduced outages at Roy hill. “The whole role (of the battery) is to eliminate spinning reserve, so we are not burning gas in standby mode,” Dimery says. “The reliability of supply has increased dramatically on the back of that investment.

Alinta sees sub 5-year payback for unsubsidised big battery at Newman

Geoff I am aware of the effect of temperature on the output. In 1990 we built a house on a large bush block. I designed and installed my own solar power system. Installing solar was the only economical answer. The nearest power lines were a couple a KM away. The cost to extend the power lines was from memory $25000. We lived with this system for 21 years and when we left the panels were going strong. Ex neighbours tell me that those same panels are still in use although the new owner has extended the system. The performance of my present system is enhanced because it us an AC system rather than a DC system. Each panel has its own micro inverter. This adds to its efficiency and also means that if one panel is shaded or fails it does not affect the output of the other panels. It also allows for monitoring of the performance of each individual panel wither instantaneously or over a given time period. We did a lot of modelling of different methods of installation and given our available roof area. We have 3 panels on the east 6 on the north and 5 on the west. This means we get a reasonable input from sunup to sundown of our high I am not naive and certainly not wealthy enough to throw away money for a feel good solution. Solar panel payback times -  Choice In terms of the mining companies adopting solar was not the cheapest method and it was only been done for PR reasons then I say so what? Any business seeks to maximise its profits. Isn't it similar to paying for adverts? By the way my understanding is that Mining companies installing solar and battery storage is also about having reserve that can be instantly brought on line.

At this very moment my output is around 172 W per panel so the total is about 2.4 KW (I can provide a screenshot for that if you like). I am expecting a total of about around about 12KWh and we will use around about 9 or 10 KWh the other 2 or 3 will go back to the grid. In summer it would be 30ish Kwh in a day of which we would use 10 or 12 KWh. I would love to see hard evidence for that. In the absence of hard evidence let's just say that is true (although I don't think so) and they are just doing it for PR reasons or greenwashing. How long could they continue to pay 4 times the price for energy? Most of these mines are in remote areas so we don't even get to observe them closely and most people are probably unaware. Rooftop solar has grown massively both in the residential area and in business premises. Are we to assume that these businesses are so unanalytical that they are increasing their operating costs? I am not a zealot and I am not going around telling people that they should get rooftop solar. I don't really care although it is a bit annoying when people assert that I am so dim that I haven't considered the capital cost, repair and maintenance and replacement of the panels (replacement will probably be a task for my heirs and successors)

Speaking of a sanity check on figures I am perplexed by these figures. To be clear I do understand that you meant 150W rather than 150KW but just to clarify are you saying that your 300w panel 150W or 150Wh?

I am just heading out (on my Ebike) so I will post a worst day graph but I can say that the modelling predicts 8MWh

A crucial piece of information missing from my above post is the size of the system. We have 14 X 320W Panels

What kW output do you get from your solar cells in a day? A 300W panel where I am will put out 150kw. Not something mentioned by PV panel salesmen. No not relying on a salesman's opinion although it is interesting to note that the modelling the company used was incorrect in that it claimed that peek daily output in mid January was predicted to be 21.1 KWh in fact as you can see it was 33.6KWh. This is an actual metering of my system. This comes information comes direct from my inverter. I can confirm the accuracy by comparing with the app from my power company. You can see from the orange stripe, which is are usage, that that we only use power hungry appliances during the day, for example dishwasher, clothes washer, most importantly hot water heater.

Why would you even ask that? Are you suggesting that people and businesses who install solar make such a basic as failing to consider the yearly savings against the capitol cost? As I said we wanted to get a battery but the payback time did not stack up. Of course we took the capital cost across the projected life of the various components

The current mining mining industry seems to think the economics make sense. Rio Tinto battery to be biggest of its type in world, and shine path to 100 pct renewables https://www.australianmining.com.au/product/off-the-grid-solar-solutions/ As for my own system I am happy to share the modeling we did and compare it to the actual performance. We did want to include a battery but it did not at this time stand up to economic scrutiny, but I expect it will as the price continues to drop.

In the context of Spacesailers query my statement is quite accurate. We were discussing the the methods of utilizing the power produced. Let me clarify my statement, I am using power that I do not have to pay THE POWER RETAILER for. This probably is not the place to go into detail but I am more than more than happy to go in to the economics of it taking all of those factors into and the modeling we did before installing it including capital costs and eventual replacement.

I dont get money paid to me from my power company. I save money in 2 ways, one way is that my excess generation is sold back to the grid (only 10 cents a Kwh) this is not cash but the amount is subtracted from my bill. The other more important way is that whilst I am producing power from my panels I am directly using power that I don't have to pay for. During the day my house is powered by the solar panels and then any excess is sold back to the grid but it is more economical if I use it directly. Spacey I am definitely not trying to convince you or anyone else to install solar but there are some myths out there that I think should be corrected. I am thread drifting here so............ oooh I know, I could use my rooftop solar to power and electric rag and tube aircraft.

If you have solar and you want to sell back to the grid you need a bi directional meter.

When the grid voltage is too high my feed in is curtailed to protect the grid. In practice this means 1 or more panels (usually no more than 4) are switched off for a short time. When this happens all of the other panels are available for me to use. If I purchased a battery or an EV with a 2 way charger I could store this electricity. My last bill was $98.67 due to accrued feed in tariff.

This is not how V2G operates. A good example of how it works is what happens now with home batteries that sell back to grid. I am looking at doing this myself so I believe I have some knowledge of how it works. Selling power back to the grid either from a home battery or from a vehicle battery entails set parameters Nobody would sell all the electricity from their battery back to the grid. For a car it would work like this. I get home from work, I plug my car in which may still have substantial charge. During peak power demand the grid using your preset limits will take a little from many batteries then during the night when demand is low and power plentiful and importantly cheap the charging begins. There are especially benefits for fleet owners. A company that owns say 100 EVs that are return to base at 5PM still with capacity that can be sold back to the grid during the evening peak (at a high price) and then can charge later during the period where electricity is cheaper. There is a trial of V2G in proposed trial in Canberra run by ACTEW and ANU involving with the ACT governments fleet of 50 vehicles. World leading electric vehicle to grid trial in ACT There are many trials in Europe Vehicle-to-grid pilot schemes gather pace and in the US First vehicle-to-grid charging pilot in the US Midwest underway I

Japan giant signs deal for 30 Australian solar farms with battery and hydrogen storage PAG says it will also begin work on developing a green hydrogen export roadmap to Japan, again using the Lavo metal hydride technology, which it says can store and transport green hydrogen safely and efficiently to Japan, and other export markets, inside a standard shipping container.

I have no idea if/when Hydrogen will become will be used in mainstream aviation. To dismiss it as some silly fantasy seems premature. Are we to suppose that Airbus is wasting money doing research on hydrogen powered aviation? Shell and Amazon forking out 21 million for something some say is merely just hype? It doesn't really matter whether some believe these companies cant see these obvious flaws. The fact is that doing research is surely a good thing and of immense interest to me and I would assume others interested in the progress of technology. Research into hydrogen aviation is not a fringe area. I never quite get why people always want to jump in on these subjects and proclaim airbus and others are simply mistaken about the potential and someone sitting behind their keyboard can with great certainty proclaim something will obviously not work. Depending on the percentage of power generated by coal in a given location. An EV in Tasmania will obviously not be powered by coal. In other states the method of generation is variable. In general power generation from coal is decreasing. An EV is as clean as its power source and power sources continue to become cleaner. My rooftop solar would allow me to drive 10000 - 14000 KM per year with the excess power I presently sell back to the grid (for a pretty poor price.) My present car used to do about 7.6L per 100KM but as it gets older it now gets about 8L per 100KM. 10000-14000 KM at virtually no cost or outside energy input seems like a pretty attractive proposition to me.

Zeravia did have a hydrogen fuel cell plane make a crash landing - no fire ZeroAvia Hydrogen Test Bed Crashes After Off-Airport Landing As of December 2020 there were about 31225 hydrogen powered vehicles on the road (worldwide), surly some of these must have been involved in accidents. I think I would rather be in a hydrogen vehicle accident where the fuel is lighter than air than in a petrol vehicle. Firstly to me at least batteries for smaller vehicles makes much more sense but to suggest that hydrogen more dangerous than liquid fuels or lpg seems at odds with practical experience. Here's why hydrogen-fueled cars aren't little Hindenburgs Turbs what are your thoughts on storing hydrogen as hydrogen as a metal hydride or in ammonia or in many of the other ways it can be stored Hydrogen storage?

There are some promising hydrogen fuel cell powered research aircraft being flown right now. Companies such as ZeroAvia who have recently purchased 2 19 seat aircraft for conversion ZeroAvia presses ahead with two hydrogen-powered 19-seat aircraft This company has serous backers behind it Shell and Amazon back ZeroAvia for emission-free flight by 2023 It is also interesting to see the intended development of 40 seat planes H2Fly and Deutsche Aircraft announce hydrogen-powered 40-seat airliner Large companies such as Airbus doing research ZEROe Towards the world’s first zero-emission commercial aircraft What an exciting time to be alive for people who love aircraft and innovation.

Danish air force acquires two electric planes

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