this post was submitted on 12 Nov 2023
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Technology

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[–] [email protected] 40 points 9 months ago (1 children)

Am I wrong or is this article 3 years old?

[–] [email protected] 21 points 9 months ago

true! i updated the title

[–] [email protected] 25 points 9 months ago (3 children)

its still costing me 30k AUD to put in a decent solar and battery system, i mean prices have come down but they are still well beyond what is affordable by the avg person.

[–] [email protected] 26 points 9 months ago (1 children)

and battery system

That's the catch. The generation isn't the expensive part. The storage is.

[–] [email protected] 9 points 9 months ago (2 children)

That's the thing, without the Battery it's not cost effective, we'll pay more for the system then it would recover. Our peak usage is at night when the sun is not there.

[–] [email protected] 1 points 9 months ago (1 children)

wouldn’t most people’s peak usage be in the afternoon when the air conditioner is running?

[–] [email protected] 1 points 9 months ago

Not with us, after 4pm is our peak usage sun won't be up for much longer

[–] [email protected] 16 points 9 months ago* (last edited 9 months ago) (1 children)

I paid $5k recently without the battery - it's not just affordable, it's cheaper than drawing power from the grid. Pay off on the upfront investment will be about 7 years and it has an expected life of 30+ years (we paid extra for long lasting panels).

Battery prices will come down - in the mean time it's still better to just get that power from the grid.

[–] [email protected] 5 points 9 months ago

Must be nice

[–] [email protected] 8 points 9 months ago* (last edited 9 months ago) (1 children)

I'm curious what sized system you are putting in that costs that much.

An 8kw solar system usually costs a bit over $8k and at least in many areas seems to have a ROI of a bit over 6 years at most and often much less.

[–] [email protected] 3 points 9 months ago (1 children)

6.2kwh solar panels 14kwh battery

[–] [email protected] 6 points 9 months ago (2 children)

that battery is way too big for the energy produced by the solar array

[–] [email protected] 5 points 9 months ago (1 children)

Yet the battery could produce more savings than the solar.

Electricity prices can vary by time of day, as demand varies. Charge it at cheap-o-clock, use it at normal times, you make savings.

[–] [email protected] 2 points 9 months ago* (last edited 9 months ago) (1 children)

It can produce more savings sure in terms of electricity costs, but when including capital, solar is presently much more cost effective. In my area some 6.8kw panels have a four year ROI.

[–] [email protected] 2 points 9 months ago

This is entirely regional though. The further you are from the equator, the more seasonal variation there is in sunlight levels, and heating/cooling loads. Around here our solar production is minimized during the season when our energy needs are maximized. We also don’t have variable rate billing, though we only get partial credit for excess generation, so battery storage will never pay for itself until something changes.

[–] [email protected] 2 points 9 months ago (1 children)

95% of what we generate during the goes to the battery and once fully charged we can go days without needing to recharge it

[–] [email protected] 2 points 9 months ago (1 children)

and then your solar panels are doing anything for you in days. you seem to have been offered a very bad deal. I suggest you find other company to analyse your case

[–] [email protected] 1 points 9 months ago (1 children)

Nope that's literally the only way you can make solar viable here. We get no credits or anything for the excess power we generate and we use hardly any power during the day. So literally any excess power the panels generate goes to waste. And if we go to a smaller unit the money we save is negligible again

[–] [email protected] 1 points 9 months ago (1 children)

You do get paid for unused solar, it's just less than it used to be. The idea is that you're meant to shift your loads to the day. Even without the additional feed in, 6.6kw only costs 2.5k and pays itself off within 4 years if you're shifting your loads to the solar peak

Also, it feels like you've installed an overly big battery system.

Panels and batteries are subsidised here in Victoria and the panels only costs 2500aud for a 6.6k system. Most people spend 20k on batteries or less

[–] [email protected] 1 points 9 months ago (1 children)

How can we shift our peak power use when no one is there to use it?. Again we did all the math even with the company and we all came to the same figure. If we did solar only then the system would cost us more in the long term as we still need to draw power during our peak usage. Battery was the only way to make it viable.

[–] [email protected] 2 points 9 months ago
  • Do things like turn on the dishwasher/dryer/washing during daytime instead using timer
  • Also, switching a heat pump hot water system and turning it on during day is effectively like a battery too. I got rid of gas (electric is healthier anyway). Most heat pump hot water systems are designed to turn on during day only

You can get devices which hook into your smart meter and measure energy usage, and optimise for that.

The reason you don't get much feedin anymore (unless you're a Virtual power plant, at times more power is needed), is because previously, people were just generating too much excess power during the day, and forcing non-renewables to turn on again at night (so it was pointless). Ideally, you should be trying to export 0kwh back to the grid

[–] [email protected] 10 points 9 months ago (2 children)

Sweet! Those panels I paid so dearly for are worth next to nothing!

[–] [email protected] 13 points 9 months ago (2 children)

your own fault. get a nuclear reactor next time d'uh...

[–] [email protected] 14 points 9 months ago

Don't you hate it when you have another control by the atomic agency just because you had a little meltdown in the garden. All that because the neighbours complained that their grass became fluorescent to the cops. Silly scared people!

[–] [email protected] 2 points 9 months ago

Ok, but hear me out, we can make atoms go boooooom so what about that???