Trail cameras for a homestead, not for deer

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Research. We have not hung a camera here yet. Worth saying plainly that trail cameras are searched several times harder than anything else on this site and most of that audience is hunting; this page is for the other use — a gate, a water source, a calving pen, or working out what is taking chickens. What follows is how cellular and card versions differ, which specifications flatter themselves, and where a camera goes around livestock. Once one has been through a winter here, this page gets updated with the date.

Almost all of this gear is designed for a subject 70 feet off, checked twice a season. Yours is 20 feet off, every day.

Cellular against a card, and the subscription

A card camera writes to an SD card. You walk out, pull it, look at it. No monthly cost, ever.

A cellular camera sends to your phone, and the camera is the cheap part. Hardware runs roughly $100 to $250; the plan runs $10 to $25 a month per camera, not per account. Three cameras is three plans. The free tier is a demo, and "unlimited" usually means unlimited at reduced resolution. Price three years before comparing models — the cheaper camera is often the one with the dearer plan.

Cellular earns its keep on a far gate you reach weekly, or a predator problem where knowing tonight is the point. Not on a calving pen forty yards off the back door.

Trigger speed and the detection zone

Trigger speed — 0.2 or 0.5 seconds — is the advertised number. Recovery time, the gap before the next frame, usually is not, and it runs from under a second to fifteen. The first frame tells you something moved. The second identifies it.

The detector is passive infrared. It reads heat crossing the beam, not approaching it. An animal walking straight at the lens trips it late or not at all, so set the camera about 45 degrees to the gate, never square down it.

Then compare the two ranges against each other. A camera that detects at 80 feet may only flash to 45. Everything past the flash is a black frame of something it detected correctly.

Night: no-glow, low-glow, white

• White flash. Colour, best identification, visible a long way, and it startles stock.
• Low-glow, 850 nm. Faint red glow at the lens. Brighter, and reaches further.
• No-glow, 940 nm. Invisible. Costs roughly a third of the usable night range, and grainier.

If the job is telling a coyote from a bobcat from the neighbour's dog, no-glow at 40 feet is a grey smear. Take the visible flash. No-glow is for when the subject is a person — and a camera someone can see deters, while one they cannot only documents.

Close range fails the other way. Infrared blows out a pale subject entirely. A white goat at ten feet at night is a white shape.

Batteries, and what empties them

Alkaline AAs lose a large share of their capacity below freezing and leak when they die in a hot housing. Primary lithium AAs cost more, hold up cold, and do not leak. Rechargeable NiMH sit at 1.2 volts against 1.5, and some cameras read a full set as flat.

A card camera on eight cells can run months. The same cells in a cellular camera reporting several times a day may not finish one. The radio is the load, so budget a solar panel for anything cellular.

Two things flatten a battery faster than any animal: vegetation moving in the detection zone, and the spider that webs the lens overnight because the infrared pulls in moths.

Mounting for livestock

Deer advice says chest height on a tree. Cattle make that wrong: anything at rub height is a scratching post, and a camera on a post at three feet is aimed at the sky inside a week. Go above rub height, six or seven feet, and angle down — or mount outside the pen looking in. A steep down-angle shortens the detection zone, so buy the height and aim gently.

Face north where you can. South takes low sun at both ends of the day and false-triggers on shadow. Lag a plate to a wood post rather than strapping to a T-post that flexes.

Be honest about calving. A trail camera reports a thing after it happened. With power at the barn a live-view camera is the better tool, and the pen is the larger decision anyway — see panels against permanent.

What we are buying

Nothing here is on camera. The rule for card against cellular is settled above and the input to it is not: distance decides it, and where a first one would point is still open, sitting behind fence work rather than ahead of it. Answer that and the type answers itself.

A purchase puts the make and model in this section, the flash type, what it cost, and the date it went up. What it actually catches is a later line, along with what cold does to a set of cells in that housing, and — if it turns out to be cellular — the plan we end on and what it really runs to a month. The Research tag comes off when a camera here has been through a winter, and the date goes on then.

Before you buy

• Price three years, not the camera. The plan is the purchase.
• Card at the calving pen, cellular at the far gate. Distance decides it, not features.
• Mount above rub height, 45 degrees off the gate, before worrying about megapixels.

— Chris D., McEwen, Tennessee