Reddit's solar-plus-battery price range, explained for Australian homes
A Reddit thread showed home battery quotes from $8k to $33k; here's how that lines up with our live cost model for solar and batteries in Australia.
What happened
A Reddit thread in r/perth asking what a midsize solar-plus-battery system "should" cost turned up answers all over the map, according to The Cool Down. One homeowner said they had quotes ranging from $8,000 to $20,000 and planned to settle on a $12,500 system. Another had financed a 16 kW solar array with a 25 kWh Sungrow battery for $14,000, paid off interest-free over ten years at $83 a month. A third reported a 13 kW/27 kWh system for a parent's home at $10,000, while a fourth quoted around $16,000 and a fifth said they paid about $11,000 after a rebate for 8.8 kW of panels and a 20 kWh battery.
At the top end, one commenter described doubling their panels from 10 kW to 20 kW and adding a 36 kWh Sigenergy battery, a 25 kW three-phase inverter and an AC EV charger for $33,000, saying their power bill was "now almost zero" even on cloudy days. The Cool Down reported that panel brand, battery chemistry, inverter type, warranty terms, financing and rebates were all cited as reasons the numbers moved around so much.
Why "normal" isn't a useful benchmark
The spread in that thread isn't a sign that anyone was ripped off, or that anyone got an unrealistic bargain. Systems described as similar in size can differ a lot in what's actually included: inverter capacity (single-phase versus three-phase), battery chemistry and brand, whether an EV charger or switchboard upgrade is bundled in, and how much of the price already has rebates subtracted. A quote with the rebate taken off looks a lot cheaper than the same job quoted before incentives, even though the underlying work is identical.
What this looks like in our cost model
We build our solar figures from labour hours and local trade rates plus materials, then check them against market pricing and real quotes, so households have a steadier reference point than a single online thread. For a typical 6 kWp rooftop system in Australia, we estimate $7,500 at the basic end, a typical $8,950 for a mid-range install, and $10,600 for a premium setup with better panels and inverter.
Adding storage moves the price the way the Reddit commenters described. A 5 kWh battery adds to roughly $8,950, a 10 kWh battery to about $10,400, and a 13.5 kWh battery to around $11,400, on top of the panel cost. That's broadly consistent with why a 6.6 kW-plus-20 kWh setup and a 20 kW-plus-36 kWh setup landed so far apart in the thread — they're different jobs, not different prices for the same job. See the full breakdown at Solar panels, including the options table (
| Material | Typical | Usual range | Lifespan |
|---|---|---|---|
| No battery | $7,500 | $5,850 – $9,750 | – |
| 5 kWh battery | $8,950 | $6,950 – $11,600 | – |
| 10 kWh battery | $10,400 | $8,100 – $13,500 | – |
| 13.5 kWh battery | $11,400 | $8,850 – $14,800 | – |
).
Rebates move the sticker price, not the underlying job
Several of the Reddit quotes were already rebate-adjusted, which is standard practice in Australia: solar and heat pump hot water installers quote after deducting small-scale technology certificates (STCs), a federal discount that steps down each year until the scheme winds up in 2030. Batteries get a similar treatment under the Cheaper Home Batteries Program, running from July 2025, which applies a certificate-based discount that reduces every six months until 2030.
State schemes stack on top in some places. Victoria's Solar Homes program offers a panel rebate of up to $1,400, with a household income cap of $150,000 applying from 1 July 2026. In Western Australia, Synergy customers can get up to $1,300 toward a home battery, rising to up to $3,800 through Horizon Power for households that join a virtual power plant. None of these change what the system actually costs to design and install — they change what's left to pay after the discount is applied, which is exactly the kind of variation that made the Reddit numbers hard to compare directly.
Getting a quote you can trust
Given how differently two "6 kW plus battery" quotes can be put together, it's worth asking any installer to itemise panel wattage, inverter phase and capacity, battery brand and usable capacity, and whether the quoted figure is before or after rebates. All electrical work has to be carried out by a licensed electrician under state licensing rules, so check that's covered too. If you've already got a number and aren't sure it stacks up, our "is my quote fair" tool compares it against the same labour-and-materials model used for the figures above, rather than against a handful of anecdotes from a forum thread.