September 23, 2025
Description
When I created the first version of the case for modular assembly using SW3518 modules, I thought five modules would be enough. Each of them has two ports — USB Type-A and USB Type-C. Ten ports should have been sufficient for all tasks. But practice showed otherwise: there are never enough ports. I constantly had to rearrange, unplug, or figure out where to plug in another cable. So, I decided to expand the project and build a more capacious unit. That’s how the second version — iCharge V2 — was born.
In the new case, I changed the orientation of the modules. Previously, USB Type-C was on top and Type-A below. Now it’s the opposite. In the first version, it seemed more logical to have USB-C on top. But real-world use proved that it’s more convenient to have Type-A above and Type-C below. A small detail, but it’s nuances like this that make a device truly practical.
In the first version, I made the light guides out of fishing line: I drilled a through hole from the LED to the outside, inserted a piece of line, and then carefully trimmed it flush after assembly. It worked, but it didn’t look great. Now it’s different: I print the light guides directly from transparent PLA. The case has a blind mounting hole above the printed light guide — no extra steps required.
Important: for a clean result, use a 0.2 mm nozzle. Both the fonts and the light guides require high precision. You can try with a 0.4 mm nozzle, but I couldn’t achieve decent quality that way.
The block now includes more 100-watt modules. Yes, if you add up the rated power of all the ports, the number significantly exceeds the power of the supply I’m using. But that’s just theoretical math. In practice, it never happens that all ports run at maximum simultaneously. At most, I draw about 100 W for a soldering station — and even then, not with this unit, but with another setup using the same modules.
Still, the principle is clear: if you plan on heavy loads, your power supply must match. Otherwise, the unit easily handles real-world scenarios: smartphones, tablets, a laptop, and a few gadgets all charging in parallel without issue.
The case design remained the same — it’s still a clamp. You can mount it on the edge of a desk, on a wall, or on a furniture frame. Mine, for example, hangs on a shelf frame, which turned out to be the most convenient option.
The modules are connected by a parallel copper bus. I used a solid 1.5 mm² copper wire. This solution serves two purposes at once: it ensures reliable current conduction and adds rigidity to the entire assembly.
Inside, everything is assembled just like in the first version. Red LEDs light up when a fast-charging protocol (PD, QC, etc.) is active, while a single blue LED indicates power. With the printed light guides, the indicators now look cleaner and clearer.
I also made a video of the assembly process. It shows every step, and even if you’re not a specialist, you’ll have no trouble following along. There’s nothing complicated about it.
iCharge V2 is the evolution of the first version. The same concept of independent SW3518 modules, but with improved layout, cleaner indicators, and an increased number of ports. The solution is simple, repairable, and adaptable. You can build your own version — with three, five, eight, or more modules. It all depends on the tasks you have and the power supply you connect.
For me, this device has become a full-fledged replacement for off-the-shelf charging stations. Only here do I know exactly what works and how.
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License:
Creative Commons - Attribution - Share Alike
Perinski
