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12v Voltage Regulator (up/down) from a LiFePo4 for a DIY uninterruptible power supply.

A.Justice

Swears he didn't start that fire.
Joined
Sep 12, 2020
Messages
1,561
Location
TN
My new house has brownouts and the mains flicker every now and then (on and off for maybe half a second, a few times in a row). I'm in the process of putting UPS's (uninterruptible power supplies) on all of my sensitive electronics.

I got a TrippLite for my computer, that gets HOT, so hot I had to add a PC fan and controller to shove air across the transformer. I got an APC unit for my main router and modem, that gets warm to touch as well.

I have a WiFi extender in the attic, that has a 12 volt input. My plan is to put a small LiFePo4 in a drawer next to it, with a 4 amp battery charger (power consumption from the router is never over 3.5 amps), and a 12 volt regulator to stabilize the voltage across the battery range and power the router.

I don't want to use a regular UPS because of the heat, it would need to be under a dresser on the carpet, or in a drawer with very little ventilation. Plus, I only need a very small amount of power, and I have most of the components needed to build a DC UPS.

I am having trouble finding a voltage regulator that will turn the 11-14 volt range of the lithium battery to a 12v stable output. All of the ones I can find require a voltage differential between the input and output, normally about 2 volts. Does anyone know of a reasonably priced unit that will convert a range of 11v-14.4v to a steady 12v (6 amp minimum) output? Any help is appreciated!
 
I would just go with an uber-cheap small SLA floated at 13.8V.

wide input range, 12V/6A output

 
I would just go with an uber-cheap small SLA floated at 13.8V.

wide input range, 12V/6A output

Much appreciated, that's exactly what I was looking for. Got the "open box" for $11!
 
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