A guide to off-grid solar
- Off-grid system prices
- Off-grid system size
- How does off-grid work?
- Considerations before you buy
- Finding an off-grid installer
Stand-alone solar system prices
|Small 2Br home:||$15,000 – $25,000|
|Average 3Br home:||$15,000 – $25,000|
|Average 4Br home:||$25,000 – $45,000|
|Heavy power user:||$45,000 – $70,000+|
Battery storage makes off-grid expensiveThe cost of an off-grid system for a typical Australian home (18kWh / day) ranges between $25,000 – $45,000. The price is much higher due to the amount of battery storage necessary to power your home during winter months and days of minimal solar production. By comparison, a 6.6kW solar system would provide ample solar power for the same electricity usage, but the cost is dramatically lower at between $6,500 – $9,000.
Battery lifeSolar batteries are the most expensive component of an off-grid system, and the cost of replacing them is high. You will likely need to replace the batteries every ten years. The cost to replace the batteries may be up to half the cost of your total stand-alone system.
After a reputable installer?
System size for off-grid solar
Days of autonomyIf you do not have any back-up power in the form of a generator, you want enough solar storage to get you through three days. If your panels do not generate any solar power in three days, you will still have power. The amount of storage and days of autonomy depends on your location; far more storage is necessary in Tasmania and Victoria as opposed to Queensland. Some off-grid installers recommend more panels and less storage, and it is best to lean on them for advice as they will understand your local conditions.
Back-up power sourceIt is common for stand-alone solar systems to have a back-up power source in the form of a diesel generator or wind turbine. Back-up power is beneficial and can alleviate the 100% reliance on battery storage.
How does off-grid solar work?
Components of an off-grid solar system
- Solar panels
- Solar battery bank
- An inverter
- Solar charge controller
- Alternative energy source (optional)