How Much Sun Does a Solar Security Camera Need?

Solar cameras are sold on a promise of install-once-and-forget, and when they fail it is almost never the camera that was wrong. It was the wall. This page is about choosing the wall, which is the only part of the purchase you control and the one no product page talks about.

What the makers actually publish

It is worth being precise about who says what, because the internet averages them into a number nobody published:

• eufy states a figure. Its support article on powering the SoloCam says the integrated panel needs at least two hours of direct sunlight per day to keep up under normal use, and the same two-hour claim appears on its product pages for the solar cameras.
• Reolink declines to. Its solar panel quick-start guide and support article say the panel needs only a few hours of direct sunlight to power the camera daily, and that the amount generated depends on weather, season and location. A Reolink blog post offers a general two-to-four-hour range as guidance, which is a rule of thumb rather than a specification for any particular model.

Treat two hours as the floor for a well-sited camera on a light event load, and treat three to four as what you want in a northern winter or on a busy driveway. Nobody can give you a single honest number, because the camera's consumption is set by how often it wakes up.

“Direct sunlight” is doing a lot of work in that sentence

A photovoltaic panel produces power roughly in proportion to the light actually striking its face, and three things reduce that far more than people expect:

1. Shade, including partial shade. A branch, a gutter, a neighbouring roof or a satellite dish crossing the panel cuts output hard — and because panels are wired in series, shading part of a panel is not a proportional loss. A spot that is “mostly sunny” with a bare branch across it at 2pm can be a poor spot.
2. Angle. Output falls as the sun moves away from perpendicular to the panel. A panel mounted flat against a vertical wall sees the sun square-on for a short part of the day; one tilted up toward the sun's average path sees it for longer. Most solar cameras have an adjustable panel mount, and most people never touch it.
3. Glass and overhangs. Behind a window, under a deep porch, or beneath a soffit, the panel is in permanent shade for practical purposes. This is the single most common siting mistake, and the eufy SoloCam's own entry names it as a disqualifier: under a deep porch overhang or on a shaded north elevation you have bought an expensive battery camera that you now have to climb up to charge.

Which way should it face?

In the northern hemisphere, south. A south-facing panel sees the sun for the longest usable part of the day and at the best average angle. East and west both work and deliver roughly half a day each, which is frequently enough for a light load. North is the one to avoid: a north-facing vertical wall in the northern hemisphere receives almost no direct sun at all for much of the year, and no panel size fixes that.

Two practical notes. The camera's best view and the panel's best aspect are frequently not the same direction — which is the argument for a model with a separate panel on a lead, so the camera can watch the north-facing side gate while the panel sits around the corner in the sun. And pointing a camera due south means shooting into the sun for part of the day, which washes out the image regardless of how well the battery is doing; angling the camera slightly off south is usually the better compromise.

The other half of the equation: how hard the camera works

Charge is only half the arithmetic. A battery-and-solar camera spends its day asleep and wakes to record an event, so consumption is set by how many events it sees and what it does about them. The same camera on the same wall can be permanently full or slowly dying depending on settings:

• Event count. A camera facing a quiet garden fires a few times a day. One facing a pavement fires every time somebody walks past, and a tree in frame fires every time it is windy. Trim the detection zone to the area you care about — this is the single most effective battery fix there is.
• Night-time spotlight and colour night video. Lighting a scene costs far more power than recording it. If a camera is draining only overnight, this is usually why.
• Live viewing. Opening the app to watch a live stream is the most expensive thing you can ask of one of these cameras. Checking in ten times a day is a habit that will flatten a well-sited camera.
• Pan and tilt. A motor that tracks movement is a motor running on your battery. Useful, and not free.

Which is why the honest version of the answer to this page's question is conditional: two hours of direct sun is enough for a quiet wall with a trimmed detection zone, and not enough for a busy frontage with the spotlight on, tracking enabled and an owner who watches the live feed.

What a solar camera cannot do, whatever the sun does

Record continuously. A battery-and-solar camera records events, not a continuous stream — that is stated plainly in the Reolink Argus PT Ultra's own entry and it applies to the whole class. If you need 24/7 footage, no amount of sunlight produces it and you want a mains or PoE camera; the retention arithmetic for continuous recording is in our continuous recording guide.

And it cannot charge in the cold. Lithium cells refuse a charge below freezing as a protection, so a camera that ran all summer can drift down through January even on a sunny wall — that is a separate problem with separate fixes, and it is covered in our winter guide.

If the spot does not get the sun

Then take the honest exit. Four options, in order of how well they work: move the camera to a wall that does get sun and accept a slightly worse view; buy the variant with a separate panel on a lead and site the panel somewhere else; run mains power or PoE to the position you actually want; or accept a manual charge a couple of times a year and treat it as a battery camera. All four are better than leaving a solar camera on a north wall and being surprised. The full set of power paths, ranked, is in our outdoor camera power guide, and the PoE-versus-Wi-Fi decision is in our PoE guide.