Build a Compact WiFi UPS at Easy

Step 1: Connect XL6009 to 12V Socket

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• Identify the OUT+ and OUT− terminals on the XL6009 module.
• Solder the center pin (+) of the 12V socket to OUT+.
• Solder the outer pin (–) of the socket to OUT– (GND).
• Use a short copper wire or jumper to strengthen the GND connection, as shown in the photo.
• Make sure all connections are solid and insulated properly.

📌 Tip: Adjust the XL6009 output to exactly 12V using a multimeter before connecting any device.

Step 2: Add 12V Input Socket to XL6009

• Take a new 12V socket and mount it (e.g., on the case side for charging input).
• Solder the + pin of the socket to the IN+ of the XL6009 module.
• Solder the – pin of the socket to the IN– (GND) of the XL6009.
• Use short wires or copper bridge for clean connections.

📌 This socket is for input power—like charging from a 12.6V charger or solar adapter.

Step 3: Fix Voltmeter and Connect to Output

• Use a small drop of hot glue near the XL6009 (like beside the potentiometer) to fix the voltmeter onto the board or case—only for holding, not locking the screw.
• Connect OUT+ of XL6009 to the V+ and V (sense) pins of the voltmeter (they’re usually internally shorted or can be bridged).
• Connect OUT– to the voltmeter GND (–) pin.

Step 4: Dd 3-Cell 18650 Holder, Mount BMS & Connect for 12V Output

• Glue the 3S BMS to the backside of the case using hot glue.
• Make sure the pads B+, B–, B1, and B2 are clearly visible.
• From the 3-cell 18650 battery holder:
• Connect the first cell’s + to B+.
• Connect the between first and second cell (middle wire) to B1.
• Connect the between second and third cell to B2.
• Connect the third cell’s – to B–.

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Step 6: Connect BMS Output (P+ / P–) to XL6009 Input

• Take two wires (red for +, black for –).
• Solder one end of red wire to P+ terminal of the BMS.
• Solder one end of black wire to P– terminal of the BMS.
• Solder the other ends to the IN+ and IN– pads of the previously fixed XL6009 module.
• Ensure solder joints are clean and not touching nearby components.
• Use short, thick wires for better current flow.

Step 7: Enclose Circuit With 3mm Acrylic Sheets

• After completing all wiring and soldering,
• Cut 4 pieces of 3mm acrylic sheet to fit the sides of your circuit like a box (front, back, left, right).
• Cut 1 acrylic piece as the base plate (bottom), and 1 for the top cover.
• Use strong glue or hot glue to fix the circuit board onto the base acrylic sheet.
• Then glue the side panels around the base to form the box walls.

📌 This gives your DIY UPS a clean, strong, and portable enclosure.

Step 8: Insert Batteries & Set 12V Output

• Insert 3 fully charged 18650 batteries into the 3-cell holder, following correct polarity.
• The BMS will now start supplying power to the XL6009 boost module.
• Power up the circuit and watch the 0.28” voltmeter display.
• Use a small screwdriver to carefully turn the potentiometer screw on the XL6009 module.
• Adjust slowly until the voltmeter shows a stable 12.0V output.
• Once set, avoid touching the potentiometer again to keep the output fixed.

📌 Always check output with a multimeter if voltmeter is not calibrated.

Step 9: Install UPS and Connect to Router

• Fix the completed UPS on the wall near your router/modem using screws, tape, or wall hooks.
• Make sure the ventilation is clear and sockets are accessible.
• Disconnect your router’s original 12V adapter from the power input.
• Plug that 12V adapter into the input socket of your UPS (to charge the batteries).
• Use a 12V male-to-male DC cable to connect the UPS output socket to your router’s power input port.
• Now, when the main power is ON, the router runs normally and batteries charge.
• During power cuts, the UPS instantly powers the router from batteries (12V output remains stable).

📌 Test backup time by removing adapter plug—router should stay ON without any delay.

Step 10: Benefits & Demo Video

Benefits of This DIY WiFi UPS:

• Keeps your WiFi router or modem powered during power cuts—no internet disconnection.
• Uses rechargeable 18650 batteries – eco-friendly and easily replaceable.
• Built-in BMS protects against overcharge, over-discharge, and short circuit.
• Boost converter gives stable 12V output for routers, cameras, or small 12V devices.
• Compact, wall-mountable design made with acrylic—safe, clean, and portable.
• Affordable and easy to build with basic tools and common parts.

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Watch the Demo Video:

See it in action and learn how it works!

📺 [CLICK HERE]