By Dave Miller · off-grid sparky · 22 years wiring solar, batteries and sheds in central QLD
“I learned the hard way after a failed 15kVA inverter left us in the dark for three days that whole-house inverters demand real redundancy, not just a big box.”
— Dave. Measure twice, buy once.
ArticlesCalculatorsSite PlannerShopLook, if you're buying a whole house inverter for off-grid living in Australia, you're not just buying a box. You're buying headaches, fines, and sleepless nights if you don't get this right. Let's cut the fluff.
Look, if you're buying a whole house inverter for off-grid living in Australia, you're not just buying a box. You're buying headaches, fines, and sleepless nights if you don't get this right. Let's cut the fluff.
Most people think "plug and play". You're wrong. Whole house inverters need proper isolation, earthing, and circuitry. You need a licensed electrician (not a "solar guy" who's never done grid-tie work). If you skip this, your insurer won't cover a fire. Period.
Key things they'll do:
Cost: $1,500-$3,500 for the electrician. Don't try to save $500 on this. You'll pay for it later.
Permits aren't optional. You need them for:
Where to apply:
Cost: $150-$400 for council permit. Distributor approval is usually free but mandatory. If you skip it, they'll shut you down and fine you up to $10k.
Commissioning isn't a checkbox. It's the final test. Your electrician must:
Don't skip this. I've seen systems fail because someone didn't test the inverter under full load. You'll be sitting in the dark at 2am with a dead fridge.
Practical Tip: Demand a commissioning report. If your installer won't give it, walk. This is your proof you're compliant. No report = no insurance cover.
Don't buy from Amazon. You need local support. Here's what's actually available:
Victron Energy (Top choice for reliability)
MultiPlus-II 5kW: $5,200-$6,500 (inverter + charger)
Where: victronenergy.com.au
Real cost: $5,800 (includes basic setup)
Aurora Energy (Local support, no overseas delays)
Whole house inverter kits: $7,500-$12,000 (batteries + inverter + installation)
Where: auroraenergy.com.au
Real cost: $9,200 (for 10kWh system)
Solax (Budget option, but check warranty)
Hybrid inverter: $4,800-$6,000
Where: solax.com.au
Real cost: $5,500 (but skip if you're in remote WA/NT)
Price note: Batteries are the real cost driver. A 10kWh battery (like Tesla Powerwall or BYD) adds $6k-$10k. Don't get scammed on "free" quotes.
Practical Tip: Get 3 quotes. One from Victron, one from Aurora, one from a local installer. If they don't mention AS/NZS 3000 or distributor requirements, they're not serious.
Whole house inverters aren't a "set and forget" thing. You need the right installer, the right permits, and the right commissioning. If you skip any step, you're not off-grid – you're just a guy with a $10k box that doesn't work. Do it right or don't do it at all.
Worth a watch: Offgrid VS Hybrid Inverters! Which one is better for the $$$?! · DIY Solar Power with Will Prowse
While many off-grid projects are achievable as DIY, certain situations require licensed professionals:
Always check local regulations and obtain necessary permits before commencing work.