SG-BUL2021 and the 2.8mm Lens: How to Verify a 4G Solar Camera Model Before You Quote It

SG-BUL2021 is not a SolaGuard part number, and “2.8mm” is a focal length, not a resolution

If you landed here searching for “SG-BUL2021 2.8mm camera,” the short answer is that the code matches nothing in the SolaGuard catalogue, which runs to 150 SKUs. What the code does reveal is the intent of whoever published it. “BUL” is the usual shorthand for bullet — the cylindrical body style — and “2.8mm” is the lens focal length, the figure that determines how wide a scene the camera takes in. It says nothing about megapixels, sensor size, runtime or ingress protection. If what you actually need is a wide-angle 4G solar bullet to quote in volume, the real equivalent in our range is the 49 AOV models, with wholesale prices quoted per order, all 2K, all IP66, with batteries from 8000mAh to 20000mAh and solar panels of 8W or 15W. Exact focal length is confirmed per SKU on the spec sheet that accompanies the quotation — never infer it from a model name.

Why codes like “SG-BUL2021” circulate, and what they cost the buyer

The solar surveillance market is full of model numbers that never left a factory. They exist because the channel invents them. A distributor builds its own naming scheme, a marketplace relabels the lot it bought in, an integrator tacks the spec customers ask about most — the focal length — onto the end of the code, and “SG-BUL2021 2.8mm” starts living a life of its own. Since OEM / private label is available on every model, the 49 AOV units included, it is entirely normal for one device to circulate under dozens of different part numbers depending on who imported it.

For a wholesale buyer that translates into three concrete problems:

1. A code that cannot be traced to a factory cannot be compared. Without a signed spec sheet you have no way to put two offers side by side.
2. The same code can cover different revisions. One lot with one battery, the next with another, both under the same name — that is an after-sales claim waiting to happen.
3. A focal length in the model name commits nobody. If it is not written into the specification you approve, it is not part of the contract.

The practical rule: ask for the factory part number, the spec sheet and the certification file before you discuss price. SolaGuard manufactures with Shenzhen Leksell, TÜV Rheinland certified and operating since 2012, holding CE, FCC and RoHS. Those documents go out with the quotation, not after payment.

What “2.8mm” does tell you, and what it doesn't

A short focal length opens up the field of view: more scene per camera, which suits yards, gates, loading bays and warehouses where the activity happens close to the pole. The trade-off is reach — a distant subject occupies fewer pixels, and identifying a plate or a face gets hard. A longer focal length does the reverse: less width, more detail at range. That is the whole trade-off, and it is why the millimetre figure matters less than the question that comes before it: what do you need to be able to recognise, and at what distance?

How SolaGuard part numbers actually read

Our codes don't encode optics in millimetres — they encode configuration. Taking SG-D42G-15F66-V1 as the worked example, the segments read as follows:

Which is why no SKU of ours ends in “2.8mm”: focal length is a field on the spec sheet, not part of the name. If a supplier hands you a code where the optics are the only verifiable element, they are giving you the figure that commits them to nothing and leaving out the ones that would.

The 49 AOV models: series, variants and exact pricing

These are the four series we put in front of anyone searching for a “wide-angle 4G solar bullet.” The counts and ranges below are exact and exhaustive — you can check them one by one in the catalogue.

Three specific references that make a representative sample order:

• SG-C41G-10T66-V1 — 2K (2.0MP), 8000mAh, 8W, IP66. The single-lens entry point.
• SG-D42G-10F66-V1 — 2K (2.0MP×2, dual lens), 8000mAh, 8W, IP66.
• SG-D42G-15F66-V1 — 2K (2.0MP×2, dual lens), 20000mAh, 15W, IP66. For sites with short daylight hours or partial shade.

Catalogue standard is 1080p–2K; 4K is built only as a custom or OEM development, never as a stock option. Local storage is microSD up to 128GB in standard configuration, with larger capacities assessed as a special order. If a competitor quotes figures well beyond these on a solar camera in the same price band, ask for the spec sheet and the lab report before you treat the two as comparable.

Dual and triple lens: why it answers the question better than a single millimetre figure

This is the technical argument worth carrying to your end customer. When a site demands wide coverage and detail at distance, a single lens forces a choice. Dual and triple-lens configurations serve both needs from one pole, on one SIM, one battery and one installation. For an integrator that means fewer mounting points, fewer data lines and fewer maintenance visits across a farm, a ranch or a logistics yard.

AOV: the distinction a buyer should understand before optics

AOV stands for Always-On Video, and it is a generic industry term rather than a SolaGuard brand: continuous 24/7 recording at low standby power, made possible by AI scene analysis managing the energy budget. The traditional alternative is a camera that only wakes on a PIR sensor, and its weakness is structural. PIR responds to a rapid thermal change inside its coverage zone. Slow movement — someone walking at an unhurried pace, livestock drifting across a field, a vehicle manoeuvring gently — may never trigger it, and anything happening outside the zone is simply never recorded. You find out late, at the point where evidence is needed and all that exists is a handful of clips with no before and no after. For livestock theft, warehouse shrinkage or an insurance dispute on a construction site, that continuity is the product.

Installation runs 5 to 10 minutes per camera: bracket, SIM, microSD, panel orientation. No mains power and no WiFi required, which is precisely why this format sells into rural sites and early-stage construction.

From spec sheet to purchase order

The catalogue is what ships from stock, but the factory builds to specification: higher resolution, a different battery and panel pairing, more storage, your own brand on the housing, packaging and manual. Quantity, final price and lead time on a custom development are always confirmed by a person, never by this page. Tier terms are set out under wholesale and the channel programme under dealers.

Checklist before you approve any quotation

• Focal length written per SKU on the spec sheet, not in the model name.
• Exact battery and panel for the lot: 8000mAh with 8W, or 20000mAh with 15W. Do not accept “subject to availability.”
• IP66 rating declared for the outdoor housing you are actually receiving.
• 4G LTE bands validated against the carriers in the destination country.
• Supported microSD capacity, and whether the card is included in the price.
• Certificates — TÜV Rheinland, CE, FCC and RoHS — issued in the manufacturer's name.
• If OEM: 100 units minimum, with brand artwork approved before production starts.

If you are holding a model code you found in a listing — SG-BUL2021 or any other — send it over with the screenshot and we will tell you the same day which real catalogue reference does that job and what it costs at each tier. Email info@solaguard.net or message us on WhatsApp at +86 188 1869 9870.