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I want to create a battery backup for my radios. Initially I'm thinking of using an Epic PWRgate and a LiFePo4 battery, so the battery is charged by the same power supply that's running the radios. The LiFePo4 batteries require a charge voltage of 14.4v. Radio gear all appears to require 13.8v±15% (11.7-15.8v), so no problem with raising the voltage there. My current power supply isn't adjustable though, and the few I've found that are have a big knob on the front which seems too easy to bump and end up damaging something.

Is there a better way to go about this? Or another precaution I can take to prevent an incorrect voltage from starting a fire?

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    $\begingroup$ Congratulations for carefully reading the manual. The block diagram shows a garden-variety "12V" supply connected to the PWRgate's "Power Supply" input, but the manual calls for the voltage you identified. I'll bet they get a lot of returns. $\endgroup$ – Brian K1LI Mar 17 at 15:59
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    $\begingroup$ Depending on how many A-h of backup power you need, you might also consider the Bioenno Power BPP-160. Its "all in one" design obviates the need for separate anything. $\endgroup$ – Brian K1LI Mar 17 at 16:01
  • $\begingroup$ That's an interesting option. Do you lose much by converting from DC->AC->DC ? $\endgroup$ – Brad Mace Mar 17 at 16:25
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One option appears to be using a DC to DC converter designed for charging house batteries in RVs, which will automatically correct the incoming 13.8v to whatever the battery requires. There are some 20A models that are cheaper than a PWRgate.

120v AC -> Power supply -> 13.8v DC -> DC-to-DC converter -> LiFePo4 battery -> rigrunner -> radios

It's possible I'm still making this more complicated than necessary though.

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