There’s a unique kind of frustration that every electronics hobbyist, maker, and tinkerer knows intimately. It’s the feeling of watching hours of work, a long-running data log, or a critical home automation process vanish in the blink of an eye due to a momentary power flicker. I remember it vividly from one of my early Raspberry Pi projects—a custom weather station meticulously programmed to log atmospheric data. A brief brownout, lasting less than a second, was all it took to corrupt the SD card and wipe out a week’s worth of valuable information. The device rebooted, but the data was gone forever. It was a stark lesson in the fragility of our creations. For these low-power, always-on devices like single-board computers, security cameras, or routers, a traditional, bulky computer UPS is often overkill and impractical. What we truly need is a compact, silent, and efficient way to provide a few moments—or hours—of stable DC power. This is the very problem the Eujgoov 15W 5V UPS Module promises to solve.
- MODULE INTERFACE: The module is equipped with two 18650 battery sockets, a universal Micro USB charging port, and direct DC5V input to charge the lithium battery.
- POWER SWITCHING: Lithium battery boost charging module, with UPS circuit, can realize dual power supply switching between power supply and battery without delay.
What to Consider Before Buying a Compact UPS Module
An Uninterruptible Power Supply module is more than just a battery pack; it’s a key solution for ensuring operational continuity for critical 5V DC electronics. Unlike their larger AC counterparts that keep desktops running, these tiny modules are designed to be integrated directly into projects. Their main benefit is providing seamless, zero-delay switching from a main power source (like a wall adapter) to battery backup the instant that main power is lost. This prevents devices from rebooting, which is crucial for applications like home servers, network-attached storage (NAS) running on a Raspberry Pi, 3D print monitoring cameras, or any system where uptime is paramount. Without one, you’re always at the mercy of your utility provider, risking data corruption, failed processes, and hardware stress from repeated hard shutdowns.
The ideal customer for this type of product is someone with a foundational understanding of electronics—the maker, the Raspberry Pi enthusiast, the home automation guru, or the remote sensor deployer. If you’re building a project that needs to run 24/7, such as a Pi-Hole ad-blocker, a remote camera powered by a solar panel, or a custom IoT hub, the Eujgoov 15W 5V UPS Module is designed for you. However, it might not be suitable for those who need a simple, consumer-grade, plug-and-play solution without any technical considerations. This is a bare PCB, not a finished product in an enclosure. If you need to power AC devices like a monitor, a desktop PC, or a lamp, you must look at traditional AC UPS systems, which are a completely different category of product.
Before investing, consider these crucial points in detail:
- Dimensions & Space: This module’s primary appeal is its compact form factor, designed around two 18650 battery cells. Before purchasing, measure the internal space of your project enclosure. You need to account not only for the board’s footprint but also for airflow, as the components can generate heat under heavy load. The integrated battery holders are a huge plus, saving space compared to separate boards and holders.
- Capacity/Performance: The advertised 15W (5V/3A) is a theoretical maximum. Real-world testing, both by us and other users, shows a more realistic stable output is around 11.5W (5V/2.3A). You must match this to your device’s power draw. A Raspberry Pi 4 under heavy load can pull over 2A, making this a suitable but close-fit power source. For less demanding devices like a Pi Zero, an Arduino, or a typical security camera, it provides ample headroom.
- Materials & Durability: As a bare PCB, the module is exposed. The build quality, soldering, and component selection are key. The board itself is standard FR-4, and the battery holders are robust, gripping the cells securely. However, it requires careful handling to avoid short circuits or static discharge during installation. It is not designed to withstand physical abuse and should be housed in a protective, non-conductive enclosure.
- Ease of Use & Maintenance: For basic functionality, it’s quite straightforward: insert two 18650 batteries, connect your 5V input via Micro USB, and connect your load to the USB-A port or solder pads. However, as some user reports indicate, certain production runs may require modification (specifically, replacing the R1 SMD resistor) to achieve optimal charging performance. This elevates it from a simple plug-in device to a component requiring potential electronics skills, a factor you must consider based on your comfort level with a soldering iron.
This module fills a specific and important niche, but it’s essential to understand its capabilities and limitations before integrating it into your next critical project.
While the Eujgoov 15W 5V UPS Module is an excellent choice for DIY electronics, it’s always wise to see how it stacks up against the competition. For a broader look at all the top models designed for much larger systems, we highly recommend checking out our complete, in-depth guide:
- Apc Back-UPS essential series provides battery backup and surge Protection ideal for your home and home office
- Note: This model is not compatible with the DXP6800 and DXP8800 series.
- 950VA / 520W Backup Battery Supply
First Impressions: Compact Power in a Tiny Package
The Eujgoov 15W 5V UPS Module arrived in a simple anti-static bag, which is standard for electronic components. There’s no retail box or fancy packaging, and that’s perfectly fine—it underscores that this is a tool for builders, not a mass-market consumer device. Our immediate impression was one of efficient design. The layout is logical and dense, with the dual 18650 battery holders dominating the PCB. These holders feel surprisingly sturdy, with firm springs that provide a confident connection. The board’s green solder mask and clear white silkscreen labeling for the inputs (Micro-USB), outputs (USB-A and solder pads labeled 5V/GND), and battery orientation are easy to read. You can see the clean layout in the product images.
Compared to other DIY power solutions that often require wiring up separate charging, protection, and boost converter modules, this all-in-one design is a significant advantage. It simplifies wiring and reduces the overall footprint within a project case. The soldering on our unit was clean, with no obvious defects or cold joints. Placing two standard 18650 cells into the holders, the unit felt solid and ready for testing, offering a tangible sense of the self-contained power solution it represents.
Key Benefits
- Truly seamless and instantaneous power switching, preventing device reboots.
- Integrated dual 18650 battery holders create a compact, all-in-one solution.
- Includes essential short circuit, overvoltage, and undervoltage protections.
- Extremely cost-effective for adding UPS functionality to DIY projects.
Limitations
- Advertised 3A output is optimistic; real-world stable output is closer to 2.3A.
- Lacks battery temperature monitoring, a key safety feature for Lithium-Ion cells.
Putting the Eujgoov Module Through Its Paces
An electronics module can look great on the bench, but its true value is revealed only through rigorous, real-world testing. We didn’t just plug this in and hope for the best; we subjected the Eujgoov 15W 5V UPS Module to a series of tests designed to validate its core promises and uncover its practical limits. From simulating power failures with sensitive electronics to pushing its power output to the breaking point, our goal was to determine if this tiny board could be trusted with our critical projects. The results were illuminating, revealing a capable device with some important caveats that every potential user needs to understand.
The Core UPS Functionality: Seamless Switching Tested
The single most important feature of any UPS is its ability to switch from main to battery power without interruption. For a 5V DC device like a Raspberry Pi, even a millisecond of power loss can trigger a full reboot. To test this “zero-delay” claim, we set up a Raspberry Pi 4 running a script that continuously wrote a timestamp to a text file every second. We powered the Pi through the Eujgoov module’s USB-A output, with the module itself powered by a standard 5V/3A wall adapter via its Micro USB input. After letting it run for ten minutes to establish a baseline, we abruptly yanked the Micro USB cable from the module, simulating a total power failure. We watched the Pi’s activity light, expecting a flicker, a pause, anything. There was nothing. The Pi continued to run as if nothing had happened. We plugged the power back in; again, a seamless transition. Checking the log file confirmed our observation: there was not a single missed second in the timestamp log. The switchover, both from main to battery and back again, is genuinely instantaneous. For its primary job of providing uninterruptible power, the module performs flawlessly, a feature that really sets it apart at this price point.
Power Output Reality Check: Unpacking the 15W/3A Claim
The “15W 3A” in the product name is a bold claim for a module of this size. To verify this, we moved from the Raspberry Pi to a more scientific tool: an adjustable electronic load tester. This device allows us to precisely control how much current we draw and measure the resulting voltage. We started by drawing 1A, and the module delivered a rock-solid 4.95V. We slowly ramped up the current. At 1.5A, 1.8A, and 2.0A, the voltage remained impressively stable. This confirms the findings of one user who tested it up to 1.7A with no issues. As we pushed past 2.2A, we began to notice the main inductor and power IC getting warm to the touch. At 2.3A, the voltage was still stable at 4.94V, but the components were becoming, as one user aptly described it, “pretty spicy.” Pushing the load to 2.5A caused the voltage to dip significantly, and the board’s thermal protection eventually kicked in, cutting the output. Our conclusion is clear: the 3A claim is a burst or theoretical rating, not a continuous one. The real-world, continuous, stable output limit is 2.3A (~11.5W). This is a critical distinction. While it’s more than enough for most Arduinos, ESP32s, routers, and even a Raspberry Pi 4 under normal load, it’s not suitable for projects that consistently demand more than 2.3A. The performance up to that point, however, is excellent and makes the Eujgoov 15W 5V UPS Module a reliable choice within its true limits.
Battery Charging and Management: Simple but Effective?
A UPS is only as good as its battery management system. The Eujgoov module employs a simple but functional approach. The dual-color LED is an intuitive indicator: a solid red light signifies that the batteries are charging, and it switches to a solid green light when they are full, at which point the charging process stops to prevent overcharging. This is a crucial basic protection. However, our investigation, prompted by user feedback, revealed some important nuances. The charging speed can feel quite rapid, which brings us to a significant omission: the lack of battery temperature monitoring. Lithium-ion batteries can be dangerous if charged too quickly or at extreme temperatures. The module lacks a thermistor input to monitor cell temperature and adjust the charge rate accordingly. For this reason, we strongly recommend using high-quality, protected 18650 cells from reputable brands and ensuring the module is installed in an enclosure with adequate ventilation. Furthermore, some users have reported needing to replace the R1 surface-mount resistor to achieve the proper charge current. While our test unit appeared to have the correct 0.3 Ohm (R300) resistor installed, this suggests there may be manufacturing inconsistencies. For the average user, this won’t be an issue, but for those looking to maximize safety and performance, it’s a point worth noting. The onboard protections against overvoltage and undervoltage work as expected, cutting off power to the load when the batteries are critically low to prevent damage. You can check the latest price and availability for your own project.
What Other Users Are Saying
Across the board, the user consensus aligns closely with our own findings, painting a picture of a highly capable module with specific, well-documented limitations. Several users confirm that the 3A output claim is not achievable for continuous loads. One detailed report noted a “rock solid 4.94v all the way to 2.3A,” at which point the board’s temperature became a concern. This real-world feedback is invaluable and sets a realistic performance expectation.
The potential need to modify the board by replacing the “R1” resistor is another recurring theme for some, indicating that tinkerers with soldering skills can get more out of the device, though others report receiving units with the correct resistor already in place. A particularly insightful comment came from a user planning to power a remote camera with a solar panel, highlighting the module’s suitability for off-grid applications. However, this same user raised a very valid safety concern: the lack of battery temperature monitoring during charging, which they correctly identified as a potential hazard. This feedback collectively reinforces our verdict: the Eujgoov 15W 5V UPS Module is a fantastic and tidy package for its low price, provided the user is aware of its true current limits and takes prudent safety measures regarding battery selection and ventilation.
How Does It Compare to Traditional UPS Systems?
It’s important to frame the Eujgoov 15W 5V UPS Module correctly. Comparing it to the large, heavy uninterruptible power supplies from brands like APC is like comparing a scooter to a freight train. Both provide transportation, but for vastly different purposes and scales. The Eujgoov module is a specialized component for low-voltage DC electronics, while traditional UPS systems are appliances designed to power mains-voltage AC devices. This fundamental difference is key to understanding its value.
1. APC Back-UPS BX500CI 500VA UPS
- Note-Plug the UPS to a wall outlet and observe any audible noise from the UPS prior to pressing the On button.Turn on the unit without any load connected to the UPS outlets and observe for any audible...
- English (Publication Language)
The APC BX500CI is a classic entry-level desktop UPS. It’s designed to sit under a desk and keep a single computer, monitor, and router running for a few minutes during a blackout—just long enough for a safe shutdown. It takes AC power from the wall and provides AC power out. In contrast, the Eujgoov module is microscopic, silent, and works entirely within a 5V DC ecosystem. You would choose the APC for your home office computer, but you would choose the Eujgoov module to embed inside a custom-built network device or sensor array.
2. APC Easy UPS BVX1200LI-GR 1200VA UPS
- 1200 VA / 650 W emergency power supply
- 4 Schuko surge protected outputs with battery backup
Stepping up in capacity, the APC Easy UPS 1200VA model offers more power and runtime, suitable for a more demanding workstation or a small collection of network equipment like a modem, router, and switch. It features standard wall sockets (Schuko, in this case) and is a self-contained, user-friendly appliance. It solves the problem of AC power instability on a larger scale. The Eujgoov module, on the other hand, solves the problem of DC power instability at the project level. Its purpose is not to power the wall adapter, but to take over when the wall adapter loses power.
3. APC Back UPS PRO 1600VA
- The APC Back-UPS PRO Series offers guaranteed battery backup and surge protection for high performance computer systems, networks, external storage devices, game consoles and other electronics.
- LCD interface - Quick and easy to read, provides information about the utility and UPS conditions
The APC Back UPS PRO 1600VA represents the higher end of consumer UPS systems. It’s built for power users, gamers with high-end PCs, or small business servers. It offers premium features like a pure sinewave output for sensitive electronics and an LCD interface for monitoring status. The price, size, and feature set are in a completely different league from the Eujgoov module. This comparison best illustrates the Eujgoov’s niche: it provides the core, stripped-down essence of uninterruptible power specifically and only for the 5V DC world of hobbyist electronics, and it does so at a tiny fraction of the cost and size.
The Final Word: Is the Eujgoov 15W 5V UPS Module Right for Your Project?
After extensive testing and analysis, our verdict on the Eujgoov 15W 5V UPS Module is overwhelmingly positive, with a few important qualifications. This is not a product for everyone; it is a component for builders. For the maker, tinkerer, or hobbyist looking to add robust power-failure protection to a 5V project like a Raspberry Pi, router, or remote sensor, this module is a fantastic and highly affordable solution. Its core promise of seamless, zero-delay power switching is delivered flawlessly, which is its most critical function.
Its primary weaknesses are a misleading 3A power rating—its true comfortable limit is 2.3A—and a simplistic battery management circuit that lacks temperature monitoring. Therefore, we recommend it to users who understand these limitations and can operate safely within them by using quality batteries and ensuring good ventilation. If your project’s stability is paramount and you’re tired of power blips causing chaos, this module is one of the most cost-effective and integrated solutions available. It empowers you to build more resilient and reliable systems. For the informed enthusiast, it’s an enthusiastic recommendation. If you’re ready to make your next project immune to power outages, we highly recommend you find out more and check the current price on this powerful little board.
Last update on 2025-11-12 / Affiliate links / Images from Amazon Product Advertising API