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gibbo9000 last won the day on August 4 2020

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  1. I haven't looked at Reposit lately but looked interesting a couple of years back, but they were a bit 'young' as a company and it was hard to get clear information on its capabilities. Hopefully that has improved. What I would look for in any truly 'smart' controller is something that looks at the local radiation forecast for the next day and and makes optimisation decisions based on that, particularly in a 2 tier tariff situations. Only that way can they effectively manage overnight charge levels depending on expected solar generation the next day. Some do that on a ' what we expect this
  2. Totally agree. I would go further and suggest the subsidy could be moved from panels / inverters towards batteries, and the power distribution companies should chip in as well. Whilst panel / inverter subsidies have been great, we are at the point where underlying costs make them a sensible investment decision without subsidies. And if the distribution companies continue to struggle (and not invest) in a network that that will embrace distributed generation, subsidise batteries to help maintain balance onthe use of the grid.
  3. Interesting and thought provoking analysis Jason. Need to think about for a while and apply it to my situation and see where it comes out. That peak rate looks high relative to Vic. We are in suburban Melbourne and more like peak 37c off-peak 22c and FIT 12c. My two immediate observations: Wonder if there is any evidence on Warranted versus Actual life for a battery - and whether depth of cycles matters. Agree it should be in the analysis though. I agree with the 'solar isn't free' argument - but for two reasons. The first is the opportunity cost of the FIT as you say.
  4. 22 Panels totaling 5.4kW and Delta Solivia inverter dating back to 2012 and still going strong. Added Powerwall 2 in 2018 along with upgrading breakers on PV set up, and rewiring and separating internal switchboard into a main and sub board to separate out the essential circuits (backed up by Powerwall) from the rest. Best advice the sparky's ever gave us was to install an MDF panel on some 2 x 4 timber behind the Powerwall / Inverter etc. to hide all the wiring. The Powerall is an AC connected system that sits on the house side of the Solar PV inverter, and comprises the battery an
  5. Good pick up. I hadn't seen this article. Makes the blood boil 🥵 This debate has been around in different forms for years - whether reductions in FIT's or potential charges, or ramping up the daily service charge so impact of FITs is less. And then there was the suggestion of gross metering rather than net. So you pay market rate for ALL electricity you consume (not just what you use after solar generation) and you get paid (or not) for everything you export). All mechanisms to rebalance tariffs at the expense of solar PV generators. The potential impact of of the growth in solar PV, o
  6. Good points, and well understood from someone who has had a few luxury cars over time. I should have prefaced better around the justification for main stream consumer roll out as a viable / affordable alternative to reasonably economical fossil fuel alternatives of the same 'style'. My argument is pretty basic and should add in servicing costs. I also understand a desire by power companies for more EVs that charge overnight to help with base load on the grid - and if so perhaps there is an argument for subsidies. From memory I think it may have been NZ that had government by EV vehicl
  7. I am not sure I have ever read a compelling comparison of EV running cost versus fossil fuel. I have pondered the maths a few times and never quite get there - did I miss something? If I consider a Hyundai Kona it has a 64kWh battery that at, say, 25c/kWH costs $16 a charge. It does around 400 km on that - so around $400 per 10,000km. The petrol Kona does around 7 litres / 100km which costs around $10. So that is going to be $1,000 per 10,000km. The petrol Elite costs around $35k and the EV one around $65k. I gotta do a lotta km to make that math work? I know there are
  8. This calculator may help you get a handle on what you could generate. https://solcast.com/rooftop-solar/free-pv-system-performance-estimation-tool/ Quite a useful site overall. One of the ones a few people use to get solar forecasts for the next day to help manage batteries. The thing to be careful of here is the maximum charge / discharge rate of the battery. The smaller batteries (1 - 2 kWH) are good for time shifting during the day (lots of small periods of storing / discharging) but not great for backup as their discharge rates are limited to max 1 - 2 amps, not enough to power
  9. Lots of good ideas above. Another option for making sure it is not something like a highly inefficient fridge (or other appliance) is to grab one of these simple power meters that you can plug into the supply to any appliance and it will tell you watts / amps etc. About $20 at your local hardware store.
  10. I thought I would share some experience on battery performance in what is probably a typical installation in suburban Melbourne. We have a 5.4kW PV system installed in 2012 with Tesla Powerwall (13.2kW storage) from 2018. My view is PV systems well and truly pay for themselves, but batteries not so - so maybe they have to go in the hobby or feel good camp. We are on a two tier tariff and our numbers show pretty consistent $150 a quarter saving across the year on top of the PV system - so roughly a 20 year payback ($600 a year on $12k for battery), which is likely well beyond the expect
  11. There are a few gems out there, but unfortunately not the mainstream guys. Hopefully this forum will surface some of our joint experiences and help mobilise what I am sure is a wealth of personal knowledge on more linformed ideas and solutions. I went through many iterations of clamps and monitoring with solar alone (as Solivia Inverter had none) feeding PV Output. Looked at Reposit Power and others after that, but Powerwall (and complete rewiring of fuse box) streamlines things. The battery challenge for those on two tier tariffs like us is using the cloud forecast to determine optimal ch
  12. Fellow SNA'r with an interest. Well done Marc. Solar panels since 2012; Powerwall since 2018. Remain amazed at lack of smarts in optimisation of effective battery usage by installers. Deployed effectively the impact on the grid is very positive IMHO, and should be the focus of subsidies. Gibbo
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