Portable power supply for space

[mahmut1313]

I wanted to build a mini pc case with plexiglass(durable plastic glass) in this case almost all psus are very big and heavy so i have been thinkin on powering pc with laptop adapter(s). It might be more then one because in a youtube video i saw a case of acer and that case was powered with 2 laptop adapters.

My Recomended psu wattage is 400 watts

So the main questions in this here is;

1. Are there any psu that is very small and light ?
2.Can I power my pc with double laptop adapters like acer did ?

Thanks All

This is the video of linux introducing double powered pc case; https://www.youtube.com/watch?v=y_iDiHc8s40

 

[blazorthon]

Powering a desktop with laptop adapters isn't that easy. Laptop adapters typically output around 19V DC and that isn't very useful for desktops which need +12V, +5V, +3.3V, -12V, and a second +5V that can be always on (+5VSB). Laptop adapters are only half of a power supply. The rest of a laptop (or that Acer) has to have more power circuitry to get actually used voltages.

You might be better off going for a small form factor PSU like an SFX unit. Those are smaller than ATX/EPS units used in most desktops. There are also very small server power supplies, but they tend to have extremely loud 40mm fans (3000+rpm lol).

Here are some example 400W units:

Here is an SFX unit:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817104132&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

This is a smaller FlexATX/miniITX PSU with one of those 40mm fans:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817104195&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

 

[Solandri]

My Recomended psu wattage is 400 watts

That right there kills your idea. There are PSUs which take DC power from a laptop AC adapter brick and convert it into the requisite 12V, 5V, and 3.3V needed by the components of your computer. The DC-to-DC conversion is actually almost trivial, allowing these PSUs to be extraordinarily small. But they're limited by the power output from an AC adapter brick, which right now tops out at around 200 Watts.

http://www.mini-box.com/s.nl/sc.8/category.13/.f

Unless you're an electrician, I wouldn't try to hook up two laptop adapters together. Likely one was being used to power the motherboard, CPU, and drives, and the other used to power the GPU. And if you do that make sure both adapters are plugged into the same wall outlet to prevent any sort of ground loop.

The AC adapter brick is basically the same thing as a PSU, just small enough that it doesn't need as much cooling. As you get to higher wattages and it needs to be cooled by a fan, it makes more sense to permanently mount it in the case to guarantee unobstructed airflow.