By Jenny Mills · rural nurse & homesteader · health, safety, law and the paperwork of going bush

“After three months of false alarms from kangaroos, I finally learned that motion sensors in the bush need a minimum 10-metre range or they are just a waste of battery power.”

Look, if you're off-grid in Australia and haven't got motion sensors on your lights, you're doing it wrong. You'll be stumbling over rocks at 3am, swearing at the moon. Let's cut the fluff.

Solar: Non-Negotiable

Forget mains-powered motion lights. Off-grid means solar. Period. Cheap $20 "solar" lights from Bunnings? They're garbage. They die in a week of Aussie sun. You need:

• 10W+ solar panel (minimum)
• 12V battery (AGM or LiFePO4)
• Proper charge controller

Example: "Solar lights that work" from EnergySaver start at $299 for a 10W kit. Cheaper = guaranteed failure. Don't skimp.

Placement: Don't Be a Dummy

Put them wrong and you'll be blinded by kangaroos or get a face full of possum. Do this:

• Mount 2.5m above ground (so no birds or cats trigger it)
• Point at entry points (gate, door, shed door)
• NO direct line to wind-blown trees or fences (they'll trigger constantly)
• Test at night: if a lizard crossing the path turns it on, move it.

Strewth. If you put it under a eucalyptus, it'll be on all night. You'll drain your battery by lunchtime.

Triggers: Set It Right or Get Screwed

Most lights have "sensitivity" and "duration" dials. Here's how to set them:

• Sensitivity: Set to 3/10 (not max). Too high = lights on for every breeze.
• Duration: 30 seconds (not 5 minutes). 5 minutes = battery death in winter.
• Delay: 5-10 seconds between triggers (so you don't get 20 flashes walking to the toilet).

Pro tip: If it's triggering on your dog, lower sensitivity. If it's not triggering on a person, raise it. Simple.

Practical Tips: What They Won't Tell You

• Battery life: In winter, expect 3-5 days on a full charge if you're using it often. Don't expect 30 days. Plan for 2x battery capacity.

• Check the angle: Wide-angle sensors (120°) cover more ground but trigger more false alarms. Narrow (90°) is better for doors.

• Test in rain: If it turns on when it rains, it's useless. Get a better one.

Australian Suppliers & Pricing (indicative prices)

Don't buy from Amazon or eBay. They're all Chinese junk. Australian suppliers have warranty support. If your light dies at 2am in the bush, you need someone who can fix it without waiting 3 weeks for a courier.

The Bottom Line

Get a proper solar motion light. Place it right. Set the triggers. Buy from an Aussie supplier. It's not expensive. It's the difference between sleeping soundly and being a night-time hazard. Stop being cheap. Your sanity depends on it.

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.