Andy Wale
a month ago
“Sunnn were very easy to work with. Communication was always promp and clear. I have recommended them to several friends and neighbours.”
The asset
A battery is the only thing that turns the spot price into a margin.
Solar without a battery just sells cheap into a saturated FiT. A battery time-shifts your generation into the evening peak, and that’s where the wholesale market pays.
Why a battery, why now
The maths finally works.
Three things changed in 2025–26: feed-in tariffs collapsed to 4–6 c/kWh, evening grid rates pushed past 50 c/kWh, and the federal Cheaper Home Batteries Program landed on 1 July 2025. On our modelling, battery payback for a typical home now falls in the range of 5 to 7 years on self-consumption alone, and a wholesale-passthrough plan can add roughly $1,000 to $2,000 a year on top. Both are modelled estimates that vary with your usage, tariff and system size, and are confirmed in your written proposal.
Feed-in tariff (avg AU 2026)4–6 c/kWh
Evening peak grid rate50–58 c/kWh
NEM dispatch peak (typical)60–120 c/kWh
NEM market price cap$20.30/kWh
Federal CHBP discount≈30% off battery
Wholesale arbitrage on 20.88 kWh$2,240/yr modelled
Live · NEM dispatch · 5-min
-/ kWh wholesale
$0.00/kWh · NSW
Sample arbitrage
20.88 kWh battery (3 × CQ7) on 6.6 kW solar in NSW
Self-use saving
$1,420/yr
Wholesale arbitrage
$2,240/yr
Federal CHBP rebate
~30% off
STCs handled
At sale
Indicative. Actual depends on usage shape, retailer plan, and program eligibility.
The stack that makes it work
Rebates pay for the install.
The wholesale market does the rest.
The federal battery rebate cuts the install cost upfront. STCs cut the panel cost upfront. And from the day you switch on, a wholesale-passthrough plan dispatches your battery against the AEMO 5-minute price, charging when the grid is paying you to take it, selling when it’s the most expensive thing in the country.
- Federal Cheaper Home Batteries Program, up to $4,000 off install
- Small-scale Technology Certificates on every panel kW
- Wholesale arbitrage, $2,240–$2,530/yr on a 20.88–27.84 kWh battery
- SAA-accredited, licensed install partners; 5-year whole-of-system warranty
Federal · live
Cheaper Home Batteries Program
up to $4,000
≈30% upfront discount on installed battery cost, applied at point of sale via the Clean Energy Regulator’s STC mechanism.
Federal · live
Small-scale Technology Certificates
$2,500–$4,200
Panel-kW based discount, varies with STC market price and your STC zone. Assigned to Sunnn at sale.
Wholesale market
Battery arbitrage
$2,240–$2,530/yr
Modelled annual income from a 20.88–27.84 kWh CQ7 stack dispatched against the AEMO 5-min spot price in NSW on a wholesale-passthrough plan.
Self-use
Solar + battery bill saving
$1,800–$2,800/yr
Standard self-consumption savings before any wholesale arbitrage, on a 10 kW + 20.88 kWh system in metro AU.
Federal CHBP and STCs are administered by the Clean Energy Regulator under the Renewable Energy (Electricity) Act 2000. Wholesale arbitrage figures are modelled on a wholesale-pass- through retail plan; actual outcomes depend on usage shape and spot price volatility. Final install pricing is confirmed in your written quote.
Reviews on Google
What our customers say.
A selection of recent verified feedback from real Sunnn customers, shown unedited from our Google Business Profile. The rating shown is our overall Google rating across all reviews.
4.9
8 Google reviews
Stuart Robertson
a month ago
“Got there in the end. Everything seemed to get in the way but James worked it out. He seems very knowledgeable and quick with a response or a fix. Ready to play at the power supply game now. With my existing solar system I was averaging costs of $120 per month, mostly connection fee. Now I'm excited to see I'm getting paid to supply power to the grid and getting free electricity.”
kelly smith
a month ago
“Great team and easy to deal with”
Daniel Green
a month ago
“I purchased a 42kw battery from Sunnn, they were a pleasure to deal with and offered the best deal in the market. With the three hours of free energy per day, i can virtually fully charge the battery and fulfill all my homes power requirements... incredible.”
Ready when you are
Get a battery designed for arbitrage.
Switch to a wholesale plan when it’s on.
Drop your postcode for a fixed-price install quote, or call 0468 028 117.
Federal CHBP rebate · STC discount · Wholesale-ready battery design · 10-year workmanship