How to power multiple DC devices with just one battery.

haynest · Mar 7, 2016

All,
I am looking for a way to power three different DC devices with just one battery. I can handle the wiring part of it, I am just looking for parts to accomplish this. My best guess is to use a power supply that takes DC input, and distributes a few different DC voltages.

First device is 5A @ 5V. Second device is 7A @ 19.5V. Third device is 5A @ 12V. The output of the battery I am thinking about using is 12.5A @ 14.4V, so I may have to take the second device out of the mix of devices I want to power. Any advice would be much appreciated.

jsmithepa · Mar 7, 2016

Yup, you are not going to get 17A out of a 12A battery.

Should be able to power the 12 volt directly? 5V throw in a 5V regulator, not the most efficient but easy and cheap.

19.5V needs a DC-DC converter like those automobile adapter.

makkem · Mar 7, 2016

Hi
Your easiest option would probably be to use an inverter with a car battery.
You have a total load of about 200W.
One of these would supply 5V @ 5A via the USB charger sockets.,the 12 V could come direct from the battery and you could plug your laptop charger (which I assume is the 19.5V) into the high voltage outlet.
http://

tsnor · Mar 7, 2016

+1 Makkem. "..probably be to use an inverter with a car battery.". Actually a deep cycle marine battery if you plan to charge/discharge more than a few times.

How long a run time ? How much output ? A commodity UPS would take all the wiring out of having a battery plus inverter. Maybe something like this http://excessups.com/apc-smart-ups-750-sua750 or this for a longer runtime: http://excessups.com/apc-smart-ups-xl-750-sua750xl?___store=default with home built battery packs.

tsnor · Mar 7, 2016

Also, they make direct laptop chargers that connect to 12V car battery. You could buy one for $25 that has the right connectors for you laptop then attach directly to the battery. Saves the 14.4v DC --> 120v AC --> 19.5V DC conversions. Here is an example: http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=PWR+Car+Charger

...or if you already have a charger that plugs into your aux power outlet in the car, just use this to attach to the battery: http://www.amazon.com/uxcell%C2%AE-Charger-Cigarette-Lighter-Female/dp/B00EZJBELQ/ref=sr_1_2?ie=UTF8&qid=1457392710&sr=8-2&keywords=cigarette+lighter+socket to get a socket you can plug your car laptop charger into.

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How to power multiple DC devices with just one battery.

haynest

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