DIY Adjustable DC Power Supply Guide

If you're interested in DIY DC adjustable power supplies, this article is definitely worth checking out.

If you've been relying on connecting batteries in series to get different voltages—whether it's various series of lithium batteries or NiMH batteries—you can use the approach in this article to achieve a more precise and fine-tuned output with a DC adjustable power supply.

You can DIY this using ready-made power modules. The finished setup looks like the picture below. The input power comes from a solar-charged 18650 battery pack stacked together, which doesn't take up much space. The adjustable range is quite satisfying: 1–36V, 0–5.1A, fully variable, and it can basically cover almost all your needs. Unless you need very high-power output, this power supply is sufficient for most purposes.

It comes with various parameters and logs, which might look like a lot of features, but you'll rarely need most of them.

The output voltage and current are recorded with historical coordinates.

For accuracy comparison: when outputting 5V, the difference from a VICTOR reference is only 0.04V.

At 36V output, the difference is 0.16V compared to VICTOR.

Even on a completely cloudy day, it still generates about 6W of power. The top-left meter shows power generation, the bottom-left shows battery capacity, and the right side is the adjustable DC-DC module.

Done.