Making a Battery Powered AIO Laptop With Desktop Parts, Need Help - Page 1
Forum section: electronics / projects

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: February 28, 2016, 12:03:09 am
content: So there are several challenges to overcome here, including cost. Here I am discussing circuitry.I have six 9ah lipo cells, and a nearly infinite supply of 18650s, I would prefer to use the lipo cells as they are far smaller and lighter.I need to power a 21in LED backlit 14v Samsung monitor (seems to work off a 16v supply, couldn't find the original one) and I haven't measured amperage...I need to power a motherboard which needs 12v, 5v and 3.3v.I estimate I need about 8-10a max on the 12v rail, not sure of the other rails.So to recap, I need to1. Find a BMS for the lithium cells, I imagine a 6 cell series pack would be the best2. Convert the battery voltage to the PC voltages, there seem to be solutions on ebay3. Power the monitor off of the cells4. Find some way to charge the cells and operate the laptop at the same time5. Make some sort of battery gauge so I know the charge. LM3914 anyone?In terms of the PC, I estimate a 35w low power t series i5, and a 60w 750ti. I currently have a core2duo and an old videocard that added up, consome the same amount of power. I am amble to keep them cool at full load with three 60mm fans at 5v. I am stumped on the power solution though.

author: wraper
author_rank: Unknown
timestamp: February 28, 2016, 12:26:11 am
content: Pretty useless idea frankly. That would be nor desktop, nor laptop but craptop.

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: February 28, 2016, 12:34:32 am
content: Quote from: wraper on February 28, 2016, 12:26:11 amI think it would be a really cool idea though. I want to do it just because. I need a laptop anyway...

author: wraper
author_rank: Unknown
timestamp: February 28, 2016, 12:40:27 am
content: Quote from: iamdarkyoshi on February 28, 2016, 12:34:32 amThat won't be a laptop which normal person would want to carry around IMO.

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: February 28, 2016, 01:03:11 am
content: Quote from: wraper on February 28, 2016, 12:40:27 amTo be completely honest, my think pad g40 isn't either. It will mostly be for LAN parties and stuff. Much better to carry this than a desktop and monitors and stuff

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: February 28, 2016, 02:56:44 am
content: I really do not see the battery powered concept being economically possible right now.Doing all of the charge circuitry and power delivery is going to cost me nearly $90 in parts, even though I already own the batteries. Doesn't matter if I go 12v or 24v for the battery setup (I have six 9Ah cells) it all prices out the same.24v$34 Main DC/DChttp://www.ebay.com/itm/Intelligent-Automotive-Car-DC-DC-ATX-PC-Power-Supply-/191166907406$23 6 cell lithium BMShttp://www.ebay.com/itm/Protection-Balance-Module-BMS-PCM-21A-for-6S-22-2V-Li-ion-Li-Po-battery-6S21W004-/221809115255$5 Buck Regulator to drive monitorhttp://www.ebay.com/itm/Car-Voltage-Regulator-12v-24-DC-Buck-Step-Down-Converter-4-38V-to-1-25-36V-DC-5A-/252191899150$23 PSU to charge batteries through the BMShttp://www.ebay.com/itm/110-220V-To-DC-24V-10A-240W-Regulated-Switching-Power-Supply-For-LED-Strip-light-/261199359000Or for a 12V setup (three series/parallel cells)$50 Wide input range Main DC/DC (works under 12V as the batteries discharge)http://www.ebay.com/itm/Car-PC-DC-DC-Pico-ATX-PSU-Power-200W-Input-8V-30V-mini-ITX-M2-ITPS-function-/311426126095$13 3 cell lithium BMShttp://www.ebay.com/itm/BMS-Balance-Control-Module-3S-21A-PCM-for-11-1V-Li-ion-Li-Po-Battery-3S21W013-/321773831774$5 Boost Regulator to drive monitorhttp://www.ebay.com/itm/LM2577-DC-3-30V-to-4-35V-5V-12V-Boost-Converter-Step-Up-Voltage-Regulator-Module-/271972488487$20 PSU to charge batteries through the BMShttp://www.ebay.com/itm/DC-12V-20A-240W-Switching-Power-Supply-Driver-For-LED-Light-Strip-AC-110V-220V-/111591648408This really is too much for me to spend for the power delivery. I might have to just make it ONLY powered by the mains using a low profile ATX supply...I am already going to spend a lot on a videocard, CPU, and motherboard. I just can't figure out a low cost way to make it battery powered.