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An indicative estimate of what a solar + battery system, sized for the wholesale market, could save at your place. Modelled on typical usage, not a quote. Check your eligibility for a site-specific, no-obligation design.
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What does this look like for your house?
An indicative range, modelled on 2026 AU retail rates and recent NEM dispatch spreads. It is a starting point only. Your written proposal uses your real interval data, your roof and your local retailer’s tariffs, and will differ from the figures here.
Fox ESS CQ7 stacks, kWh. Modules are 6.96 kWh each.
Indicative estimate · NSW · 20.88kWh
$2,755–$5,334/ year
An indicative Year 1 range, combining reduced grid purchases with modelled wholesale arbitrage. This is a preliminary estimate based on typical usage, not a quote.
Reduced grid purchases
$1,411–$3,094/yr
Wholesale arbitrage
$1,344–$2,240/yr
Your current bill is about $3,600 a year. A system does not remove a bill entirely: you still pay supply charges and buy power the system cannot cover. The top of this range sits above your current bill because arbitrage is export income earned on top of a reduced bill, not a further discount on it. It also assumes a battery this large suits a home of your usage, which the designer call would confirm.
This is a preliminary estimate, not a quote. It is based on typical usage for the bill size you selected. A site-specific proposal using your actual interval data, roof, shading and network tariff will differ, and may be higher or lower than the range shown.
This uses the same self-consumption model as the design software behind your written proposal. It assumes a 10 kW solar system paired with a 20.88 kWh battery, and modelled usage of about 9,407 kWh a year once supply charges are removed from the bill you entered. The range spans a night-heavy household at the low end to a day-heavy one at the high end, which is the biggest single driver of how much of your own solar you actually use. Savings from self-use can never exceed what you spend on energy.
Wholesale arbitrage requires a wholesale-passthrough retail plan (such as Amber or Localvolts); on such a plan your import price is also exposed to the spot price. Arbitrage figures are modelled from AEMO 5-minute dispatch data for December 2024 to November 2025, after charging cost and round-trip loss, and assume a 10 kW inverter.
Figures are modelled estimates, not guarantees. They exclude system cost, finance, maintenance, inverter replacement and battery degradation over time. Sunnn is not an electricity retailer and does not set market or retail prices.
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- Backed by an established Australian business group
- Tier-1 panels and FoxESS batteries
- Systems configured to suit a wholesale retail plan
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