Epson WorkForce WF-7840 Ink Cartridges
Your Epson WorkForce WF-7840 uses the 812 / 812XL / 812XXL cartridge series, which relies on a four-cartridge setup to keep your print workflows moving smoothly. Our 4.8 Google rating is built on dependable cartridge performance and uncompromising product quality. Having supplied reliable consumables for this printer since Dec 2020, we understand the specific replacement behaviour of small business operators who frequently upgrade to XL or XXL black ink to balance the depletion rates of high-volume text document layouts.
Page output expectations in workplace environments
Real-world cartridge longevity depends heavily on document coverage, though Epson calculates standard page yields using the ISO/IEC 24711 metric for inkjet systems. Heavy text layouts consume the black ink significantly faster than the colour counterparts, making high-yield setups the logical baseline for small business printing.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| 812 | Standard | Black | 350 | $0.089 |
| 812 | Standard | Cyan | 300 | $0.098 |
| 812 | Standard | Magenta | 300 | $0.098 |
| 812 | Standard | Yellow | 300 | $0.098 |
| 812XL | High Yield | Black | 1,100 | $0.046 |
| 812XL | High Yield | Cyan | 1,100 | $0.044 |
| 812XL | High Yield | Magenta | 1,100 | $0.044 |
| 812XL | High Yield | Yellow | 1,100 | $0.044 |
| 812XXL | Extra High Yield | Black | 2,200 | $0.032 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Managing print costs with compatible alternatives
Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. Choosing third-party alternatives provides a practical method for reducing everyday document production overheads without sacrificing legible text crispness or basic graphic presentation. To gain a complete overview of the differences between these product types, read our comprehensive genuine vs compatible cartridges.
Sourcing your replacement cartridges
Small businesses reliant on consistent print production typically find value packs to be the most reliable method for maintaining continuous workflow uptime. If you print heavy text volumes with minimal colour requirements, mixing an individual 812XXL black cartridge with standard 812 colour elements delivers a highly stable cartridge balance. All compatible options purchased from our catalogue are covered by a comprehensive money back guarantee. Free delivery applies on all orders over $99 (conditions apply), dispatched rapidly from our regional supply warehouses located across Perth, Brisbane, Sydney, Melbourne, and Adelaide. For other models, explore the wider Epson ink cartridges range.
Pro Tip
Always install the 812XXL black cartridge if your workplace prints high volumes of monochrome invoices or multi-page text documents, as this specific cartridge holds double the ink volume of an XL black ink tank, significantly reducing the frequency of physical printer interruptions.
Frequently Asked Questions
Can I mix a genuine 812XXL black cartridge with compatible 812XL colour cartridges in the printer?
Yes. This printer system handles a hybrid configuration perfectly well, allowing you to deploy a genuine extra-high-yield black cartridge for primary administrative documentation alongside compatible colour cartridges to lower graphic output costs.
Why does my printer report low colour ink when I only print black text documents?
The printer uses small volumes of cyan, magenta, and yellow ink during regular maintenance cycles to prevent the microscopic printhead nozzles from clogging, meaning your colour cartridges will slowly deplete over time even if your print jobs are strictly monochrome.
What is the physical size difference between an 812 standard cartridge and an 812XXL cartridge?
The external plastic shell dimensions are identical across the standard, XL, and XXL sizes to guarantee they fit securely into the same print carriage slots; the only difference rests within the internal sponge capacity and fluid ink volume loaded during manufacturing.
