Question Good low powered PSUs?

[gindor]

I'm building a new office PC and I can't find a good low powered PSU.
The be quiet PSU calculator estimates 94 watt peak, I estimate a very theoretical 145 W peak. The PC will idle a lot, where it might need as little as 28 W.
With this I figured a PSU with 150-160 W would be ideal. The problem is that the lineup of most well known brands bottoms out at 300 W. Below 300 W I can only find very cheap and sketchy units, though even those seem to bottom out at 200 W.
Am I too stupid to find good low powered PC PSUs or are they just not a thing and if so why?
I’m from Germany, therefore availability within the EU would be nice.

Why not just buy a 300 W unit then?: Because afaik the efficiency of most PSUs drops significantly below 50% load, especially below 10% (remember that my PC will idle a lot).

Which form factor do you need?: Preferably full ATX but smaller should be fine.

What are the specs of your PC?: AMD Ryzen 5 3400G (+stock cooler), MSI A520M Pro, 1x 8 GB G.Skill Aegis 3200 MHz CL16, 1 TB Kingston NVMe SSD (SA2000M8/1000G), some old SATA DVD drive, 1-2 cheap case fans, some old mid tower ATX case

 

[Jimminy]

In cases like this, where efficiency is the main/only goal, it's usually best to design and build your own one-off power supply that meets your exact needs. This is what NASA would do. You are unlikely to find a mass produced unit that exactly fits all your requirements.

I'm too lazy, so I would buy something close, and not worry about the extra 10 cents per month on the utility bill.

 

[UsandThem]

Be Quiet offers some lower wattage units that are still good quality.

https://www.bequiet.com/en/powersupply/pure-power-11/1532

Availability is not so good in the States, but may be better in your location.

 

[VirtualLarry]

What are the specs of your PC?: AMD Ryzen 5 3400G (+stock cooler), MSI A520M Pro, 1x 8 GB G.Skill Aegis 3200 MHz CL16, 1 TB Kingston NVMe SSD (SA2000M8/1000G), some old SATA DVD drive, 1-2 cheap case fans, some old mid tower ATX case

I DON'T believe that the A520 chipset is compatible with the 3400G. Are you sure that it (your mobo model) is?

AFAIK, the A520 chipset is ONLY currently compatible with Zen2 (3000-series) CPUs only. It will be compatible with the 4000-series (Zen2 APU) as well, once those are finally released to the DIY market. But I've seen disclaimers on some mobo mfg's websites, that those A520-chipset boards ARE NOT compatible with the 3200G and 3400G and Athlon 3000G. (Those are all 2nd-gen Zen+ APUs, and not "true" 3000-series / Zen2.)

 

[VirtualLarry]

As to the point in your OP, consider (if mobo is micro-ATX or ITX), an In-Win case, with an SFX / TFX PSU between 150W-300W? They have a few recent cases that are 80Plus Bronze or Gold rated, I forget.