I have a LiFePO4 12.8 V, 20 Ah capable of 244 watts. I am trying to power a computer that needs regulated 12 V that will need 200 W. The regulators I find on Amazon don't cut it. The ones that handle the power needed are of 24 V input and the ones that are of adjustable input/output voltage cannot handle the 200 W power. Any suggestions on how I can get this to work?

I also don't want to put two batteries in series to get the 24 V of some of those regulators for reasons of portability of the batteries. (I plan to travel with the batteries so I will later put 3 × 100 W in parallel.)

More info on computer: it is a built computer using the PSU found link below. It says input is of range Input voltage: +12V/DC(11.4-12.6V). te battery is 13.4V when fully charged.

https://www.amazon.com/gp/product/B07PPYWGNH/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 RGEEK 24pin DC ATX PSU 12V DC Input 250W Peak Output Switch DC-DC ATX Pico PSU Mini ITX PC Power

  • \$\begingroup\$ If the PC takes 12V it is highly likely it will work with the unregulated 12V-14.4V from the battery. If this is the case, maybe you don't need a regulator. \$\endgroup\$
    – bobflux
    Commented Jun 7, 2021 at 21:43
  • \$\begingroup\$ If you want portability, use a computer that requires much less than 200W. Your battery will be lucky to last 30 minutes. \$\endgroup\$
    – Finbarr
    Commented Jun 7, 2021 at 21:44
  • \$\begingroup\$ @Finbarr the 20Ah battery should last for a few hours. the computer will be on average 80W running. \$\endgroup\$
    – Hadi Jaber
    Commented Jun 7, 2021 at 21:54
  • 2
    \$\begingroup\$ Where do you get the "regulated 12.05V" specification? It seems unreasonably precise. \$\endgroup\$
    – brhans
    Commented Jun 7, 2021 at 22:05
  • 1
    \$\begingroup\$ Oh yes the internal 12V rail is most likely straight from the 12V input. Since no component in the PC actually uses 12V, it's all buck switching converters to generate all the low voltages... \$\endgroup\$
    – bobflux
    Commented Jun 7, 2021 at 22:55

1 Answer 1


If you're serious about wanting a whopping 200W, the M4-ATX-HV from mini-box (the US Pico-PSU distributor) claims to do it. They've also got a variety of smaller options including some lower powered LiFePO4 UPS gadgets.

Realize that 200W means you need to be prepared for 17A sustained current in all of your 12V wiring. Both inside and outside the batteries. That's a LOT... you need wide gauge wires and heavy duty connectors and battery packs designed for such a high discharge rate.

  • 1
    \$\begingroup\$ Also, re: "I plan to travel with the batteries"... if you intend air travel, look up restrictions on battery capacities and quantities you are allowed to carry anywhere you might go. It doesn't matter if LiFePO4 is "safe", security theater agents won't care. \$\endgroup\$
    – gps
    Commented Jan 18, 2022 at 3:16

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