What microSD Card Do You Need for 24/7 Tank Camera Recording?
A tank camera recording 24/7 needs only a Class 10 or U1 microSD card, 128 GB or smaller: both guarantee 10 MB/s sustained writes, more than 2K needs.
For a tank camera that records around the clock, a Class 10 or U1 microSD card is enough, and 128 GB is the largest card a VuePod accepts. Both of those markings guarantee the same thing — a sustained write speed of at least 10 MB/s — which is comfortably more than a single HD video stream needs. You do not need a V30, a U3, or a 512 GB card, and on a camera capped at 128 GB a bigger card is not a bigger buffer; it simply will not be read.
The card is also not in the box. VuePod ships with a USB-C cable and a DC 5V/1A adapter, but the microSD card is sold separately, so it is worth knowing which one to put in the cart alongside it.
What do Class 10 and U1 actually mean?
Both are floors for sustained write speed, and both sit at 10 MB/s. Class 10 is the older Speed Class marking, shown as a 10 inside a C. U1 is the newer UHS Speed Class marking, shown as a 1 inside a U. They are measured slightly differently, but the promise a buyer cares about is identical: the card will keep accepting data at no less than 10 megabytes per second while it is being written to continuously. That is the number that matters for a camera, because a camera never stops writing.
What these markings do not describe is the card’s peak speed, its read speed, or how long it will survive. The big “170 MB/s” on the front of a retail package is a best-case read figure measured in a card reader, not a promise about writing video. A card can advertise a huge read number and still only guarantee the same 10 MB/s floor underneath.
microSD markings and what each one guarantees
Minimum sustained write speed only. Figures are the floors set by the SD card standard, not the peak speeds printed on packaging.
| Marking | What it is | Minimum sustained write (MB/s) | Needed for a 2K tank camera? |
|---|---|---|---|
| Class 10 (C10) | Speed Class | 10 | Yes — this is the recommended level |
| U1 | UHS Speed Class 1 | 10 | Yes — equivalent to Class 10 for this purpose |
| V10 | Video Speed Class | 10 | Fine, same floor under a different label |
| U3 | UHS Speed Class 3 | 30 | No — harmless, but you are paying for headroom you will not use |
| V30 | Video Speed Class | 30 | No — aimed at 4K and high-bitrate capture |
| “170 MB/s” on the label | Marketing read speed | Not guaranteed | Ignore it — it says nothing about sustained writing |
Do you need a V30 or U3 card instead?
No. V30 and U3 both guarantee 30 MB/s, and they exist for 4K and high-bitrate capture where a single stream can genuinely outrun a 10 MB/s floor. A 2K camera writing one continuous stream does not come close to that ceiling, so the extra class buys headroom that sits unused. If a U3 card is on sale for the same price as a U1, there is no reason to refuse it — it will work. Just do not pay a premium believing it will make the live view smoother or the recording more reliable, because the bottleneck in a tank camera is the Wi-Fi link and the camera’s own encoder, not the card.
How many days of footage fits on a 128 GB card?
That depends entirely on the bitrate your camera writes at, and VuePod does not publish a bitrate figure — so anyone quoting you an exact number of days for this camera is guessing. What you can do is the arithmetic, once you know the bitrate any given camera is recording at. Capacity divided by bitrate is the whole calculation: 128 GB is roughly 1,024,000 megabits, so dividing by the bitrate in megabits per second gives you seconds of footage.
Hours on a 128 GB card, by bitrate
Pure arithmetic, assuming continuous recording, the full 128 GB usable, and a steady bitrate. These are not VuePod figures — use them with your own camera’s reported bitrate to estimate your own window.
| Steady bitrate (Mbps) | Approximate hours on 128 GB | Approximate days |
|---|---|---|
| 1 | 284 | 11.8 |
| 2 | 142 | 5.9 |
| 4 | 71 | 3.0 |
| 6 | 47 | 2.0 |
| 8 | 36 | 1.5 |
Three things shift the real answer away from the table. Variable bitrate encoding means a busy scene — fish darting, a filter outflow churning, lights cycling — writes more data per second than a still tank at night, so the window breathes. On cameras that offer it, event-only recording — writing only when motion is detected — stretches the same card much further than continuous recording does. And continuous-recording cameras generally loop rather than stop when the card fills, overwriting the oldest footage first, so the practical question is not “how long until it runs out” but “how far back can I still look.”
Does a “high endurance” card matter for 24/7 recording?
It matters for lifespan, not for speed, and it is a different axis from everything above. A card has a finite number of write cycles, and a camera recording continuously in a loop rewrites the same card over and over for as long as it is plugged in — a far harder life than a card in a phone that gets written to a few times a day. Cards sold as high endurance or for surveillance use are built for that pattern.
Endurance is not part of the Class 10 or U1 markings, which is why a card can satisfy the recommended speed class and still wear out sooner than you expected. If you plan to leave a tank camera recording permanently, an endurance-rated Class 10 or U1 card at 128 GB or below is the sensible combination: the speed class you actually need, with the write life to survive the duty cycle.
What a card choice cannot fix
A microSD card decides where footage goes and how far back it reaches. It does not improve anything you see. Buying a faster or larger card will not sharpen the 2K image, will not widen the lens, and will not stop glare on the glass — glare is solved by mounting flush on clean outer glass and keeping the tank brighter than the room, not by storage.
It also will not add capability the camera does not have. VuePod has no night vision and no infrared, so a dark tank stays dark on the recording no matter which card is inside; if you need to see the animals overnight, the honest answer is that this is not the camera for it. The card will not extend the camera’s reach either — VuePod is wired, powered over USB-C, and not battery powered, so storage is irrelevant to whether it stays on. And nothing on the card measures water: there is no temperature, pH, or water-quality sensing in a camera, so a full 128 GB of footage still tells you nothing about your parameters.
Two more cases where the card is the wrong thing to shop for. If you want footage kept somewhere other than the tank room, local recording is the wrong tool and optional cloud storage is the thing to look at — though with VuePod, local recording, live view and capture all work with no plan at all. And if your card keeps filling faster than you want, the fix is accepting a shorter look-back window and pulling the clips you want to keep off the card, not hunting for a bigger one, because 128 GB is the ceiling the camera reads.
The short version
Buy a Class 10 or U1 microSD card, 128 GB or smaller, and buy it separately because it is not in the box. Both markings guarantee the same 10 MB/s sustained write floor, which is more than a single 2K stream needs, so V30 and U3 are spare headroom rather than an upgrade. Spend the extra money on endurance instead of speed if the camera will record continuously, and remember that no card adds night vision, sensors, or a larger ceiling than the 128 GB the camera accepts.