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Benje

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About Benje

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  • Birthday 27/04/1959

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    Norwood
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    Australia

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  1. Marc 1. Daily usage is around 40 kWh per day, but there have been days where usage is 80 kWh. If this was a 'flat load' than the average demand would be just under 2 kW. Your demand wouldn't be flat of course - it would be higher during the day/evening and lower overnight. But, to state the obvious, a 2kW load for 24 hours a day is 48 kWh. So, if you had a 2 kW generator running 24 hours a day, it too would produce 48 kWh, and you would be self-sufficient. If you put in a generator that produced up to 10 kW (eg a solar system), and your load only reached 2 kW (if you had the mythical flat load) then you would use 2 kW in-house and export 8 kW. Such a scenario means you are effectively a generator, as most of your output is exported. But the pricing/value of that export is unknown in future years - if there is a glut of energy at the time of export, who is going to pay you a decent price for that? I mention this just to set a framework for the latter discussion. Don't read too much into it. 2. The heat chart gives us some information. That is the first chart above, with the orange/yellow/white squares. Each square seems to be the kWh used for a half-hour. If we double that number, we get the average kW for that half hour. The scale at the bottom implies a logarithmic approach. Critically, orange seems to be 0.5 to 1.0 kWh (so 1 to 2 kW), yellow is 1 to 2 kWh (so 2 to 4 kW) and white seems to be above 2.5 kWh (so 5 kW). From the chart, there are some days when the daytime is 'white' ie above 5 kW. That might average one day a week. If you have a 5 kW PV system and it was outputting 5 kW at that 'white' time, then all of the PV would be used in-house. If you were in the yellow, perhaps 60% of the output would be used in-house, and 40% exported. If you were in the orange than 20% would be used in-house and 80% would be exported. If you have a 10 kW PV system, and you were using 5 kW, than half is used in-house for that time and half s exported. If you have a 20 kW PV system, then when you were using 5 kW only a quarter of output is used in-house. Summary Others here will have a better understanding, but it seems to me that you have a moderate load for a lot of hours. If you can shift load into the daytime, then get a larger system. But solar isn't suited to supplying an infrequent peak. A battery could do that, but the grid is probably much cheaper. Target your solar size to what you will use a lot of the output in-house. get your panels located where you like the aesthetics, where they get good, uninterrupted sun (ie no shading) and have some with westerly aspect. If you have lots of day-round usage, it may be that a time-of-use tariff will give you the price savings you seek, with a suitably sized solar system cutting a big hole in that as well. I would like to check my half-hourly usage profile with the likely PV output profile, to see how much of the output I'll use in house. (do you have the half-hour data that sits behind the multi-coloured chart?) A battery is a separate exercise, and if you do the sums I suspect you will find the pay-back period to be many years. I would wait myself for that. Using the solar to heat the pool is a great idea - in-house use is always hard to beat even if daytime prices (solar sponge) go down in future. Benje
  2. @Marc my email arrived today. I was disappointed as Sime forsaw. Oh well, not long to wait till the latest delivery estimate. Benje
  3. Marc that looks like a remarkably large system. Much bigger than I would expect. I agree with the west facing panels - more useable energy from them. Also, be careful with the value of exported PV. I expect you want to self-supply, not be a power generator exporting to the grid. daytime prices used to be high, and are lower now. Could be lower tomorrow, certainly in a few years time. The 'expensive' stuff is the 4pm-9pm period when solar is winding back and domestic is ramping up. I would value your west facing panels more highly as a result - better market value and more likely to be used in house. We had a hot day the other day - that will be on your meter data now and should show the upper limits you might use. I assume you have some understanding of the PV profile, and how it varies by season and by panel orientation. Just don't expect to get much output when the sun gets low in the sky, especially in summer when it sets in the south-west unless your panels are orientated to the west. It would be really good to see a profile of your daily load over recent weeks. That will give more sense to the appropriate sizing (others have suggested this as well). Benje
  4. @Marc I haven't got the email yet either. Perhaps the email is coming, or perhaps there are some orders being supplied in December (but not all orders). I was pretty quick off the mark with my order - so I'm hopeful but waiting to be crushed with disappointment. Benje
  5. rmpyf Amber Electricity is doing a 1000 household trial in SA involving device control and pool price. They got funding from the SA Government Demand management fund. They do retailing through energy Locals with pool price membership. It was in the paper today. This program, coupled with the network TOU tariff, will be a good start. The device control is only a single device (I think) - I'll try and do floors in winter and air-con in summer. I think I have to commit to 12 months membership of Amber electricity. Could be interesting. I have been thinking further about this - it must be more valuable to do something with the market than to try and do it for self-consumption. Why use a battery to supply yourself with energy which the market should be able to do easily, when the market values your demand response/battery etc more highly than the cost of the in-house energy saved. A community solution must be more efficient than self-use - isn't free trade more efficient than trade barriers? Benje
  6. rmpyf Smart tank? Rheem system? I'd like to link three appliances to a pool-price switch, and use the grid as my battery. In winter, I have underfloor heating. Happy to turn it off for a few 5-minute intervals or more if the price is high. The house won't be that cool, and we can run the air-con when we need to (price allowing). I have a large air-con, but the need isn't extreme for it as downstairs where we live doesn't get as hot as upstairs. If the price goes high, happy to turn off and go see the neighbours or the local pub. A bottle of wine at the neighbours and/or a couple of drinks at the local will be a lot less than the savings from having low consumption during extreme price events.. If I have pool price exposure, I'd even turn off the panels when the pool price is significantly negative. I don't have electric hot water, so the Rheem Tank hasn't been an option. I would use the SA residential TOU tariff with this arrangement if I can get it to go - run my floors early morning and during the day, with low network prices and using my PV output plus low pool prices.. Of course, I might be dreaming, and/or before my time. We will see. Just ideas now. I'd rather do this and work with the grid than spend more money on trying to optimise my own PV output. It also removes the ened for another big box (battery and/or tank) which is unlikely to get domestic planning approval. Benje
  7. good choice zippi - 6 heads are better than 4!
  8. zippi I have a Panasonic NV-F66A available for free in Adelaide. It is a 4-head hi-fi, now 18 years old. Didn't go 2 years ago but still available. Hopefully doing a local offer for free on a free for sale thread is OK.... Benje (Norwood)
  9. That is sub 6 minute kilometres Pops - a great barrier to beat first up. Tell her that a Kenyan female ran Chicago on Sunday in 2:14:04 - for the full marathon! That will bring her back to earth :)
  10. Trevor was it a warm day? Warmer than you had been training in? That would do it. Last year (Melbourne 2018) was horrid with a hot north wind. Benje
  11. outstanding boys. great times.
  12. What age would Jim Fixx have dies if he didn't run? Would he have lived longer?
  13. I kept a frozen water bottle in the freeze, and would roll my feet on it morning and evening. That helped. After a run, if I was at a cafe I would get (apart from something to eat and drink) a glass fullo ice cubes. Chuck them in a sock and rest my foot on the ice cubes sock. Benje
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