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koputai

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Everything posted by koputai

  1. Analysis for September 2020 Daily Averages - Production: 40.6 kWh Consumption: 30.3 kWh Own Consumption: 15.8 kWh Export: 24.7 kWh Import: 14.4 kWh Cost: - $1.29 (ie. earned $1.29 per day) Yield: 4.7 kWh/kW September was sunnier than predicted, as production was 1,218 kWh against a predicted 1093 kWh (11% over predicted). The best day was September 26th with 56.9 kWh produced. The worst day was September 18th with just 6.0 kWh produced. In September we had 25 'Green Days', where we exported more than we imported, our b
  2. Hi Arnold, welcome to the forums. With your Fronius Smart Meter, yes you need a ‘Premium’ account, but you just have to create it, it costs nothing. It’s free. Making a premium account gives you a lot of very useful extra features. Cheers, Jason.
  3. Analysis for August 2020 Daily Averages - Production: 37.3 kWh Consumption: 40.9 kWh Own Consumption: 17.3 kWh Export: 20.0 kWh Import: 23.6 kWh Cost: $3.35 Yield: 4.3 kWh/kW August was sunnier than predicted, as production was 1,156 kWh against a predicted 913 kWh (27% over predicted). The best day was August 23rd with 48.8 kWh produced. The worst day was August 7th with just 3.3 kWh produced. In August we had 15 'Green Days', where we exported more than we imported, but overall the month was not a 'Green Month'.
  4. Hi Raffinator, welcome to the group. Northern Beaches here as well. Maybe you could show us your system in that section of the site, others are always interested in other setups. I agree with you about the EV situation, the current range and pricing here in Aus doesn't make me want to rush out and buy one, even though I would love one. Cheers, Jason.
  5. Our electricity bill for the 3rd quarter is in. Over winter, 28 May to 27th August, our breakdown was as follows. Solar Production was 2,725 kWh at an average of 29.6 kWh per day. Our usage of the solar production was 1,400 kWh, which is 51% own usage. Our usage from the grid was 2,216 kWh at a cost of $732.52, and we fed 1,325 kWh back to the grid (after own usage) for a return of $279.26. Our net bill was $453.26 Taking in to account our own usage, the total saving for the quarter due to the solar was $564.57 Effectively, our bill was reduced fro
  6. I wouldn't be touching Mitsubishi with a barge pole at the moment, it's possible they will drop out of Australia totally. IMO hybrids were a necessary step, but totally useless now. Go fully electric if you can find one you like with the range you need, or just get a turbo diesel if you are travelling very long distances. With a hybrid, you are lugging around a whole lot of extra weight and complexity that you're not using. Cheers, Jason.
  7. In a lot of the older suburbs of Sydney, three phase power is normal. Post-war a lot of Sydney houses installed three phase instant electric water heaters. The classis unit was the Simplex which pulled eighteen amps per phase. Cheers, Jason.
  8. A guy named Robert Murray-Smith has a cool channel on the you tube, in this episode he explains how this works, and builds a little one himself. Cheers, Jason.
  9. It’s a thing. I know, I’ve got it. I check our power consumption between two and ten or so times a day. Last Friday I had a Fronius Smart Meter installed to monitor consumption on my circuits that I call ‘Climate’, which is air conditioning and underfloor heating. I now know how much power the underfloor heating in the bathrooms really uses. 15kWh per day on weekends, and 10kWh per day during the week. Cheers, Jason.
  10. Fronius also do some very good webinars on the you tube. They did one a while back on this subject. Cheers, Jason.
  11. The Tesla Powerwall is getting on a bit, and uses the wrong chemistry for a home battery anyway. I'd be really keen to see something new from them. Cheers, Jason.
  12. Marc, check if your heat pump is 'Smart Grid' ready. Fronius have a document that is relevant to your inverters here: https://www.fronius.com/~/downloads/Solar Energy/Whitepaper/SE_WP_Connecting_a_heat_pump_to_the_Fronius_energy_management_system_EN.pdf Cheers, Jason.
  13. Wow, you guys down there in VIC get these systems cheap! A quick run of the numbers, that system should average about 20kWh per day over the year, from around 32kWh/day in Dec/Jan, to 8kWh/day in June. Cheers, Jason.
  14. Sorry, I mentioned the round trip efficiency but forgot to use it in the calculations. With that corrected: 38c + (55c x 1.11) = 99c charging with Peak 38c + (25c x 1.11) = 66c charging with Shoulder 38c + (15c x 1.11) = 55c charging with Off-peak 38c + (21c x 1.11) = 62c charging with solar generation. If you want to take the opportunity cost in to account, the battery can do 5,000kWh per year, and $14,000 invested at 5% returns $700p.a. $700 / 5000kWh = 14c per kWh to be added to the above figures. Cheers, Jason.
  15. I’m never a person to go with the ‘budget’ option as it’s usually just ‘cheap’ and leads to disappointment. For perspective, I went with a Fronius inverter and QCells panels, $10,500 for 8.58kW. I expect payback to take less than four years. That said, my brother in law went with a Fronius inverter and cheaper panels. He paid a lot less than I did, and got 11kW. His payback will be even shorter. Going with cheaper will likely pay for itself in a reasonable time frame, but you’ll probably be pulling them off the roof in ten years to replace them.
  16. I agree totally Gibbo. The only reason I didn’t include the sunk cost of the solar, and even its opportunity cost, is that I was purely analysing the battery as a separate entity to the solar. Of course, I didn’t include the opportunity cost of the battery either, which at around $700 per year is not to be sneezed at. Cheers, Jason.
  17. Naturally when I was thinking about having a PV system installed at home I also thought “I should probably get a battery as well”. A couple of d friends have Tesla batteries and rave about them, so I was keen to convince myself that I needed one too. Now, I always spend heaps of time analysing my projects, thinking of the various ways it could be done, done better, done prettier, and occasionally in that process I reconsider whether it should actually be done at all. Price definitely comes in to play, but I don’t like to do things cheap, that’s usually just the long way to spending m
  18. Nice work Steve. Wine fridges are huge power users, as are a lot of small fridges. I think there’s some errors in some items on your list: The pool filter. 2 hours, 0.8kWh. The average size pool pump draws about 1kW. That’s 2kWh per day right there, more if there is a controller/salt water chlorinator rather than a simple timer running it. Lounge AV. 6 hours, 1kWh. Just the standby on a TV and AV receiver is likely to be 0.5 to 1 kWh per day, let alone having it running for 6 hours. Study. 10 hours for laptop and monitors at 0.6 kWh means they’re o
  19. In NSW you can still get a 21c FIT, so still well worth doing. I suspect those rates will come down heavily by the end of the year. Cheers, Jason.
  20. Cool, so you can get total combined data in your energy balance. Cheers, Jason.
  21. Steve, it really helps to do an audit. Get a spreadsheet (or a bit of paper) and go to every room, and every space, inside and outside your home. Write down every item in each space that uses electricity, and its Wattage (W). Next write down whether it is: 1. Always on 2. On standby. If on standby, write down how many hours per day it's turned on, that's your 'on' hours. Twenty four minus that number is your 'standby' hours. 3. Only on when switched on (such as a lamp). Write down how many hours per day it's turned on. That's a good starting point to findin
  22. A rough estimate of your solar yield based on your location and roof layout, with a 5kW system on your East facing roof, you would average around 16kWh per day over the year. As long as you get a decent feed-in tarriff, it would be worth doing. Cheers, Jason.
  23. Marc, elsewhere you said you have two Fronius Primo's. Are they hooked up to appear as the same system in SolarWeb, or are they two separate pages? Cheers, Jason.
  24. Steve, based on what you claim to be running, that level of power usage is ridiculously huge! Your pool running hours are very low. Normal pool filter run times should be six to eight hours in Winter, and seven to ten hours in Summer. Also, are you sure your bills are 'Actual Read' and not 'Estimate' ? Cheers, Jason.
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