5 x SigEnergy SigenStor Bat 8.0 (8kWh/battery) + 12kW inverter (Sigenstor EC) on single phase. The SRES battery rebate (https://cer.gov.au/batteries) was ~30%. Total was a bit under $15k. I already have 16.6kW of panels on the roof from 5 years ago.

There are two providers (Globird and Ovo) I have been researching that provide 2-3 free hours of electricity per day between 11-2pm. That + solar would easily fill the batteries, so that power bill might drop even more.

You should get some quotes from battery/solar installers (no doubt you have heard of solarquotes.com.au). Prices have dropped a lot this year.

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Jedd 3 days ago | parent [-]

Excellent info - thank you.

Yes, I've been through solarquotes.com.au a few times but haven't looked in earnest for some time. This is encouraging information.

I know my usage can easily be 15-20kWh in a day, and I can get a week of overcast though it's not common.

The 'free' electricity offers presumably are in return for a guarantee to feed-in to them outside sunlight peak, I suppose?

I assume the power providers have come up with ToU and FiT tariffs based on a LOT of data, so we here with our spreadsheets and one or two datapoints aren't likely to come out far ahead, but it sounds like break-even within a few years is feasible.

	▲	discordance 2 days ago \| parent [-]
		They don't require that we feed in at any specific time, but they do price their peak rates quite high so you have to ensure you have enough storage to not consume at those times. No doubt their models and prices will be updated once more large homes BESS are installed.