By Dave Miller · off-grid sparky · 22 years wiring solar, batteries and sheds in central QLD

“After blowing three cheap inverters, I learned that a 12V shed needs exactly 100Ah of lithium to survive a QLD winter without the lights flickering out.”

No fluff. Just how to get your off-grid lights working without wasting cash. We're talking real-world Aussie conditions.

Fixture Types: Stop Buying the Wrong Stuff

Don't buy fancy LED globes for your shed. You need purpose-built solar lights. Here's the real deal:

• Pathway lights: Cheap, basic, and useless for anything but stepping stones. Get the fixed type with a solar panel on top. Example: 400lm LED path light (not the 200lm "garden" kind).
• Spotlights: For security. Must be weatherproof (IP65+) and have a wide beam. Don't use cheap "garden" spots – they die in a dust storm.
• Task lights: For your kitchen or workshop. Needs high CRI (90+), bright, and dimmable. Skip the $20 "solar" lamp – it's garbage.
• Emergency lights: Mandatory for off-grid homes. Must have 3+ hours backup. Don't skimp.

Placement: Don't Be a Dumb Aussie

Bad placement = wasted money. Here's how to do it right:

• Panel placement: Must get 6+ hours of direct sun. No shade from trees. South-facing in the Northern Territory? Bullshit. North-facing for all of Australia. If it's shaded, you're wasting $200.
• Light placement: Don't point lights at your house. Point them at the path or door. If you're lighting a 3m-wide path, you need one light every 3m. Not every 10m. Stupid.
• Storage: Batteries need to be in a dry, shaded spot. Not under the eaves where it gets 50°C. If your battery dies in 6 months, you placed it wrong.

Brightness Calculation: Stop Guessing

Forget "bright" or "dim". You need lumens. Here's the formula:

Lumens needed = Area (m²) × 10

Example: Your 4m x 3m kitchen needs 120 lumens. But wait – solar lights lose 30% efficiency in winter. So you need 170 lumens minimum. Don't buy 150lm lights. You'll be fumbling in the dark.

Rule of thumb: 100lm = 1m² of light. 300lm = 3m². Simple. If your light says "1000lm" but it's a tiny bulb, it's lying. Check the actual output.

Australian Suppliers & Pricing

Stop buying Chinese knock-offs on eBay. These are the only suppliers that work in Aussie conditions:

Final Word

Don't buy the cheapest. Don't buy lights that don't say "IP65" or "400+ lumens". Get the right fixtures, place them right, calculate lumens properly. Then you'll have light that actually works. Not a $200 mistake.

When to Call a Professional

While many off-grid projects are achievable as DIY, certain situations require licensed professionals:

• Electrical work beyond basic 12V DC additions — requires a licensed electrician
• Structural modifications to buildings or load-bearing elements
• Gas line installation or modification
• Solar array installations above safe voltage thresholds
• Any work that affects the structural integrity of your property

Always check local regulations and obtain necessary permits before commencing work.