Click here to Skip to main content
15,884,388 members

Welcome to the Lounge

   

For discussing anything related to a software developer's life but is not for programming questions. Got a programming question?

The Lounge is rated Safe For Work. If you're about to post something inappropriate for a shared office environment, then don't post it. No ads, no abuse, and no programming questions. Trolling, (political, climate, religious or whatever) will result in your account being removed.

 
GeneralRe: USB for Power? Pin
Richard MacCutchan11-Feb-21 21:28
mveRichard MacCutchan11-Feb-21 21:28 
GeneralRe: USB for Power? Pin
James Curran11-Feb-21 23:28
James Curran11-Feb-21 23:28 
GeneralRe: USB for Power? Pin
glennPattonWork312-Feb-21 0:00
professionalglennPattonWork312-Feb-21 0:00 
GeneralRe: USB for Power? Pin
James Curran12-Feb-21 5:37
James Curran12-Feb-21 5:37 
GeneralRe: USB for Power? Pin
trønderen12-Feb-21 7:23
trønderen12-Feb-21 7:23 
GeneralRe: USB for Power? Pin
ElectronProgrammer12-Feb-21 7:53
ElectronProgrammer12-Feb-21 7:53 
GeneralRe: USB for Power? Pin
trønderen12-Feb-21 9:34
trønderen12-Feb-21 9:34 
GeneralRe: USB for Power? Pin
ElectronProgrammer13-Feb-21 7:59
ElectronProgrammer13-Feb-21 7:59 
Ignore that last phrase. It was for another post. Must have mixed them. Sorry D'Oh! | :doh:

trønderen wrote:
Look at the cabling for your 230VAC supply: A 1.5 sqmm is considered enough to carry 10A, or 2300 watts. Use the same cable with 12VDC

That does not look correct. You can't just assume that because a wire can stand 10A AC it will also stand 10A DC. The power loss to heat is different.

To carry 10A DC at 12V you need a thicker wire and I'm not sure the 4sqmm wire you mention are thick enough.

I did a quick search and found the two calculators below that seem to confirm my suspicions.

For the numbers you give 12V DC, 10A load, maximum 8 meters you need a 16sqmm wire otherwise you will have a voltage drop that may be significant. And in DC, that voltage drop will translate to heating of the wire which, in turn, might degrade the wire insulation. The second site actually mentions heat.

I have inputted some numbers and a 4sqmm seems to support approximately 2A DC.

<a href="https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator">DC Cable Sizing Tool - Use The Correct Sized Cables - Free Calculator</a>[<a href="https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator" target="_blank" title="New Window">^</a>]

<a href="https://faroutride.com/van-build/tools/wire-calc/">WIRE GAUGE CALCULATOR: What Wire Size (AWG) Do You Need? | FarOutRide</a>[<a href="https://faroutride.com/van-build/tools/wire-calc/" target="_blank" title="New Window">^</a>]

As far as I know, here in Portugal, 12/24VDC power distribution can be used in commercial buildings only. Residential buildings can only use 12/24VDC for signaling (very low current used in things like smart home systems) and must have a separate tube from power.

To have something like a solar panel or a battery pack, one must use a converter to 230VAC.
GeneralRe: USB for Power? Pin
trønderen13-Feb-21 12:54
trønderen13-Feb-21 12:54 
GeneralRe: USB for Power? Pin
ElectronProgrammer15-Feb-21 2:41
ElectronProgrammer15-Feb-21 2:41 
GeneralRe: USB for Power? Pin
trønderen15-Feb-21 4:20
trønderen15-Feb-21 4:20 
GeneralRe: USB for Power? Pin
glennPattonWork312-Feb-21 8:08
professionalglennPattonWork312-Feb-21 8:08 
GeneralY'know Pin
Chris Maunder11-Feb-21 6:15
cofounderChris Maunder11-Feb-21 6:15 
GeneralRe: Y'know Pin
Mircea Neacsu11-Feb-21 6:22
Mircea Neacsu11-Feb-21 6:22 
GeneralRe: Y'know Pin
Slacker00711-Feb-21 6:30
professionalSlacker00711-Feb-21 6:30 
GeneralRe: Y'know Pin
Greg Utas11-Feb-21 6:51
professionalGreg Utas11-Feb-21 6:51 
GeneralRe: Y'know Pin
Daniel Pfeffer11-Feb-21 8:10
professionalDaniel Pfeffer11-Feb-21 8:10 
GeneralRe: Y'know Pin
trønderen11-Feb-21 9:14
trønderen11-Feb-21 9:14 
GeneralRe: Y'know Pin
Slacker00711-Feb-21 9:47
professionalSlacker00711-Feb-21 9:47 
GeneralRe: Y'know Pin
Daniel Pfeffer11-Feb-21 10:03
professionalDaniel Pfeffer11-Feb-21 10:03 
GeneralRe: Y'know Pin
trønderen11-Feb-21 12:15
trønderen11-Feb-21 12:15 
GeneralRe: Y'know Pin
Jörgen Andersson11-Feb-21 20:21
professionalJörgen Andersson11-Feb-21 20:21 
GeneralRe: Y'know Pin
trønderen12-Feb-21 12:15
trønderen12-Feb-21 12:15 
GeneralRe: Y'know Pin
Mycroft Holmes11-Feb-21 10:21
professionalMycroft Holmes11-Feb-21 10:21 
GeneralRe: Y'know Pin
Gary R. Wheeler11-Feb-21 15:31
Gary R. Wheeler11-Feb-21 15:31 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.