Solar Panels

Pitched on all 4 sides
I told you I was tired! For some reason I was thinking gable ends.

I'd assume there is not too much in it, one way or the other. Even in summer, option 2 will be dropping off for those last few hours due to insolation decreasing due to the greater angle of incident. Option 1 maximises the morning (cooler) generation and in Winter, the insolation levels are quite a lot less and can do with all the help it can get. In your case, it seems you've calculated what you need to reduce your usage more than worrying so much about the FiT return, so it'd likely be advantageous to you to attempt to harness a more even summer and winter output, which will be option 1. I'd almost be thinking it will come down to aesthetics that suits you best. Is your hot water also solar?

I'm not up with NSW grid connection restrictions. Can you connect 15kW without issue? You'd likely need to gain approval from the supply authority in your area first.
 
According to installer, no issues with grid to install and grid connect a 15kW or higher array.

My hot water is bottle gas powered instant.
I’m thinking of going back to electric storage as a cheap de facto battery. (The existing instant HW will stay as a backup)
 
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We changed our behaviour on when we use some of our biggest electricity using appliances. The washing machine and dish washer as well as the pool heat pump run during the day now as they run for free mostly.
The change to LED lights lowered our night time consumption.
 
Unfortunately our biggest electricity consumption is 2x RC A/C. About 50kW per day.

We got a SS house so when heat rises it hits the roof not recycled into first floor
 
We moved to split system units and everyone was happier. Then we saved a bunch when the children moved to their own lodgings. We cool the house during the sunlight hours in summer.
On really hot nights we just run the bedroom split units all night where someone is sleeping. We have 4 bedrooms upstairs and one for grandma on the middle floor so she has no stairs to climb.
 
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According to installer, no issues with grid to install and grid connect a 15kW or higher array.
Before committing cash to the deal, run it past your supply authority and get their response in writing. It's not just a matter of what is permitted, it's also a matter of what is possible and if they have too many solar installations feeding the distribution network off your local transformer, they can (and sometimes do) limit the size of your installation and/or refuse it completely. It may not be an issue at all, but it's always better to know of any limitations before you sign on the dotted line!

My hot water is bottle gas powered instant.
I’m thinking of going back to electric storage as a cheap de facto battery. (The existing instant HW will stay as a backup)
Ah, so it may pay to have a slightly bigger array than currently calculated, or have you included for that already? Your idea is sound. Why be paying for gas when you don't need to? Heat the water during the day where all you are losing is $0.13 per kWh. That's comparable to night rate tariffs (cheaper than mine, in fact) without the additional metering and circuitry costs.

We changed our behaviour on when we use some of our biggest electricity using appliances. The washing machine and dish washer as well as the pool heat pump run during the day now as they run for free mostly.
The change to LED lights lowered our night time consumption.
This is the secret. Solar electricity is suitable for a variety of families but it does need thinking about. I've still got my heat pump hot water on night rate, but that suits me as it maximises my solar export. It also makes it easy for me to track hot water costs. Over almost 5 years, our heat pump on night rate has averaged 2.78kWh per day or 48 cents per day at current T.31 rate.

Unfortunately our biggest electricity consumption is 2x RC A/C. About 50kW per day.

We got a SS house so when heat rises it hits the roof not recycled into first floor

Has your advisor looked at the whole of house energy efficiency, or just the solar? We are somewhat different due to the FiT, but my system cost me about $35000 all up, we don't count kWh and just live comfortably, have not had an electricity bill for about 5 years and when all our system is connected (right now, due to the reno's, I only have 12.5kW connected), we expect a cheque for $20k a year. We've already more than paid back the system costs and hope to have many years yet out of these current panels. We also don't have gas bills as we converted everything to electricity. In my opinion, it takes a whole of project look at it to achieve the best outcome. If you haven't already, I'd suggest you ask your advisor to do an energy efficiency survey of the whole house. The outcome may alter your thoughts on that larger array!
 
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We should never have gone to ducted AC.
Split systems for each room is much better

However being an existing construction the ducts were already in when we upgraded the AC

.....

Whole house ..

Yes have energy monitors on inverter AC.
LED lights
Heavy curtains for windows
Roof insulation
Pool pump is the variable speed efficient one
Nothing else can be done

Because of single storey, the house is long - reason for 2xAC. If double storey then one AC would have sufficed

....

Street power is on electric poles with 2 groups of wires. Top 3 wires are some higher voltage and every so often goes to a pole mounted transformer which connects to the lower group of 4 wires. My input voltage is 250V (actual) because the pole mounted transformer is next to the service pole inside my boundary.

I shall ask grid company and see.
In any case the official limit is 5kW per phase.
So I should be OK I think
 
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Just install two or three splits in the areas you use the most is a solution. We have more than three as we did them before the kids grew up and moved out. The big RC A/C system is not needed but still there.
 
Just install two or three splits in the areas you use the most is a solution. We have more than three as we did them before the kids grew up and moved out. The big RC A/C system is not needed but still there.

Yes there is excess kW to be able to install some splits for some annoying cold spots. Possible for these to be only on when there is solar generation

If I install electric storage HW as FiT = off peak tariff there is really no need to load shift from off peak to solar generation period, but as prices are rising it would make sense to have the HW heating only in the solar generation period
 
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I'm just in the process of installing ducted, but it is only for aesthetics as I don't like the look of the indoor units hanging off the walls. We are though, doing (likely) 3 separate ducted units, so we will achieve a similar degree of control as non-ducted splits. Alternatively, I may do individual splits to the bedrooms and just leave the ducted for communal areas which would normally all run together in any case. I'm really hoping that with the changes our reno has made, that we won't need them much at all. Time will tell.
 
... we don't count kWh and just live comfortably, have not had an electricity bill for about 5 years and when all our system is connected (right now, due to the reno's, I only have 12.5kW connected), we expect a cheque for $20k a year.

I must say, this isn't sustainable for the electricity market :p

I'm sure you and others don't make a dent in the retailers bottom line, so even if they weren't paying you for the power you're generating the existing rates would still be rising, but there's probably some correlation (whether real or pretend) between the cheque they send you and the cost of power increasing for everyone else.

Who knows if a model where the "FiT == Import Rate" would be sustainable to the retailers or not, but I'm not greedy and appreciate that there is an upkeep of the grid that needs to take place through the daily supply charge, and that never paying a retailer for power again has to logically end with the grid or the retailer failing.

I own a car, and my yearly registration for said car goes towards keeping the road network (more or less) in working order. If I owned a car and the government paid me for owning it every year I would expect more potholes to form over time, or my neighbours rates to increase over time ;)
 
I must say, this isn't sustainable for the electricity market :p

I'm sure you and others don't make a dent in the retailers bottom line, so even if they weren't paying you for the power you're generating the existing rates would still be rising, but there's probably some correlation (whether real or pretend) between the cheque they send you and the cost of power increasing for everyone else.

Sustainability has absolutely nothing to do with incentives to get start ups out of the ground!

The FiT that I get is no longer available and for me too it has a used by date. Take the FiT out of the equation and it's now still viable. The incentives were put in place by Gov'ts who never dreamed they'd be so successful, but the reality is, they worked and worked better than most would have predicted. Quite apart from the political rhetoric we so often hear about renewable energy incentives being the scourge of the energy society, that isn't actually true. The incentives simply shift the cost of polluting power to subsidise clean power to enable a different future. "Everyone else" as you say, would be paying more for power regardless, I'm afraid. At the moment, it's just easy for politicians (and disgruntled electricity consumers) to blame the renewable incentives for it.

I went to the Brisbane release of the BZE Stationary Energy Plan in circa 2010 in Brisbane. The plan was touted (respectably with a number of heavy-weight supporters including Malcolm Turnbull, the IEA, a former Chief Scientist of Australia, a former Managing Director of the Electricity Supply Association of Australia, numerous associated university professors, numerous sundry politicians and even the former executive director of the Australian Coal Association) as being a genuine roadmap to a 100% renewable energy future at an affordable $8/week/household. The then Qld Premier, Anna Bligh had the blatant audacity to stand up and reject the plan outright, on the sole basis that "Qlders won't accept an additional burden of $8/week/household". She then went on to oversee electricity price hikes in Qld of at least that amount, if not more.

The simple reality is that the politicians (ie, the Howard Gov't and at least in Qld, the Labour State Gov't) who implemented these incentives, never in their wildest dreams expected they'd be successful at all, let alone to the level to which they have been. That is not a failure, but a massive success but the big problem lies, not with the success of the schemes, but with the fact all Gov'ts are shackled by the nipples to the income produced by coal and will not (despite the rhetoric) let that slip without a bloody big fight ... and the easiest way to do that is to blame the success of the renewables incentives.

Just think Sam, had Anna Blight not been so blinkered by coal sales, we here in Qld would have shortly (within a few years) been 100% renewable supplied. The difference between Qld and the woes SA faced would have been worlds apart. SA were forced to make quick decisions as the technology was not around early enough for them to transition and the imminent death of their coal fired plants simply meant they transitioned and faced the transitional hurdles without backup. Qld coal fired plants are still some years away from retirement and we could, and should, have made the transition with all the baseload backup we may have needed! Interesting to see that the Tesla battery project to support base load related issues in SA has already been proven successful and Victoria has ordered a similar battery.

I also noted at the start of this thread, some negative comment about the renewable incentives. That criticism is unfounded to be honest. The schemes have worked far better than ever thought and they are on target (in fact the targets are being brought forward) to finalise the incentives whilst we continue to see a positive future for those renewables. The alternatives that the likes of Tony Abbott are touting are not just a continued reliance on fossil fuel generation, but a ramping up of such. Abbott is not a fool. He is recklessly gambling with the health of Australians in an attempt to get a foot back in the door of the PMs office. We also hear how coal fired plants are not subsidised at all. That's nothing more than playing with words to tell lies. The fuel for coal fired generation is totally tax free and although technically not a subsidy, is certainly happening and there is no end in sight for that either. The upshot is that according to the International Monetary Fund (IMF), Australia still supports fossil fuel generation plants to the tune of about $1700 per person per year. Compare that with the stationary energy plan of $8/week/household!!! Given we average somewhere around 2.6 people per household then that means we currently subsidise coal to the tune of $1700 per person per year compared to what could be $160 per person per year as forecast by the stationary energy plan, but it's all semantics whilst politicians continue to deny subsidy of fossil fuel power generation.

Sam, you're entirely correct. What I get paid for selling my surplus electricity is not sustainable in the long term. No one suggests it is, however not many seem too worried about the hidden subsidies of coal. I'd suggest that the incentives given to kick start renewables will in the course of time, be very worthwhile, even without the argument surrounding global warming, as it's certainly proven that so many of our health issues are attributable to coal and oil pollution. I'm not even sure why Gov't are so cough about thermal coal. About 50% of coal production is for steel production and that will continue regardless. Thermal coal will transition over a period of time and not be such a big problem as they tend to think it is.
 
How does it work Sam? I don't have any smarts with mine (well none that's connected) and I just use a spreadsheet and occasionally update it with the readings I take manually.
 
How does it work Sam? I don't have any smarts with mine (well none that's connected) and I just use a spreadsheet and occasionally update it with the readings I take manually.

It can be updated manually, but I believe most modern inverters can be set up to send readings directly to the website.
 
Thanks for the very interesting reading!

We’ve a local community bulk buy program here, and are looking at a 3kw system. Due to roof orientation & size the 5kw system doesn’t generate much more. As we’re all electric (plus wood heating) we’ve already done our best to optimise our efficiency (usage) and only use 8 - 12kwh per day. Clearly our house is much smaller than many here, and here in the highlands the need for aircon is almost none!

I work from home most of the time, so we will also be able to adjust some behaviours to use things (washing machine, dishwasher etc) during daylight hours. I’m super excited as to what we can achieve with a small system, but we’re tackling this more from a ‘good thing to do’ perspective, rather than financial benefit (I think our payback for <$5k is still 6+ years!)
 

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