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Chuckalicious



Member Since: 23 May 2014
Location: Midlothian
Posts: 1698

United Kingdom 2014 Freelander 2 SD4 SE Auto Santorini Black
USB Power

Ok. I hard wired a dashcam in ages ago using a piggyback fuse to a fuse in the footwell fusebox. I think it's a 5A rated fuse location. I later needed another USB socket so I swapped the usb charger for a 2 socket one.

However I now ideally need 3 USB feeds.

I'm not 100% on how the amp ratings for each fuse location works so don't know what I'm best doing. Should I find a second fuse location that is ignition switched and run a separate USB socket or should I be ok to have one of those 3 socket chargers?

Just worried Im gonna blow something! Learned to drive in 2011.
Bought a Micra - great little car
"Upgraded" to Kia Sportage - hated it
Proper upgrade to FL2 TD4 GS 60 reg Facelift - tailgate paint issues, fuel gauge rewire, transfer box failure at 36k miles, clutch at 60k
Reconditioned diff at 70k ish
Sold at 84k and now on a DS. Terribly unreliable.
Sold DS for a 2021 Mitsubishi Outlander PHEV. Fingers crossed....
Sold Outlander for a 2014 SD4 SE Tech because I’m mental

Post #358368 8th Oct 2018 4:57 pm
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p_gill



Member Since: 06 Dec 2011
Location: USA
Posts: 1218

United States 2008 Freelander 2 i6 SE Auto Tambora Flame

Which location in the fuse box are you using? Fuse number?

The USB devices that you connect should draw more then 0.9 amps. (that is for USB 3.0 which is the worst case)

For three devices that's 2.7 amps on a 5.0 amp fuse.

It should work fine.

As long as the other device on the circuit isn't drawing much power.

Back to my original question.

Which fuse?


Good Luck

Paul

Post #358393 8th Oct 2018 8:21 pm
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p_gill



Member Since: 06 Dec 2011
Location: USA
Posts: 1218

United States 2008 Freelander 2 i6 SE Auto Tambora Flame






Post #358396 8th Oct 2018 8:27 pm
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Vanny



Member Since: 06 Dec 2015
Location: Cheshire
Posts: 436

United Kingdom 2013 Freelander 2 SD4 XS Auto Santorini Black

I think your saying you piggie backed into the fuse box a 12v to 5v step down converter with a single 5v USB outlet. The piggie back has a 5a fuse, at 12v, so 60watt. You want to power 3x 2.1a usb outlets at 5v so about 31.5 watt plus the heat losses in the converter ( this will vary by technology type).

Strikes me that the fuse will be more than man enough, but what the wiring is like and the actual rating of the proposed 3x usb devices I don't know, so I can't be 100% sure.

Post #358397 8th Oct 2018 8:27 pm
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Chuckalicious



Member Since: 23 May 2014
Location: Midlothian
Posts: 1698

United Kingdom 2014 Freelander 2 SD4 SE Auto Santorini Black

Thanks for all the replies. Will check tomorrow what fuse number I'm using.

The actual wiring is a 12v cig lighter socket wired into the piggy back fuse, with a normal car USB charger plugged into that.

But I think I've been misreading ratings and getting my Watts and amps mixed up! Learned to drive in 2011.
Bought a Micra - great little car
"Upgraded" to Kia Sportage - hated it
Proper upgrade to FL2 TD4 GS 60 reg Facelift - tailgate paint issues, fuel gauge rewire, transfer box failure at 36k miles, clutch at 60k
Reconditioned diff at 70k ish
Sold at 84k and now on a DS. Terribly unreliable.
Sold DS for a 2021 Mitsubishi Outlander PHEV. Fingers crossed....
Sold Outlander for a 2014 SD4 SE Tech because I’m mental

Post #358398 8th Oct 2018 8:30 pm
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p_gill



Member Since: 06 Dec 2011
Location: USA
Posts: 1218

United States 2008 Freelander 2 i6 SE Auto Tambora Flame

Chuck,

You can buy one of these and measure the current draw by the circuit


https://www.amazon.com/302M-Fuse-Buddy-Min...fuse+buddy





If you measure the current draw then measure worst case with battery on your phone depleted for example if you are charging the phone)





Results from the current measurement test

1.0 AMPS Stop thinking about this problem and go have a pint
2.0 AMPS Feel good about what you accomplished, pat yourself on the back
3.0 AMPS Tell all off your friends that you are gifted when it come to electronics
4.0 AMPS Its time to look at using a circuit rated for more current
5.0 AMPS Stop using the setup and find a 10 AMP circuit to tap into (or two 5 AMP)


Good Luck

Paul

Post #358402 8th Oct 2018 9:25 pm
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Chuckalicious



Member Since: 23 May 2014
Location: Midlothian
Posts: 1698

United Kingdom 2014 Freelander 2 SD4 SE Auto Santorini Black

Thanks Paul - very useful. Learned to drive in 2011.
Bought a Micra - great little car
"Upgraded" to Kia Sportage - hated it
Proper upgrade to FL2 TD4 GS 60 reg Facelift - tailgate paint issues, fuel gauge rewire, transfer box failure at 36k miles, clutch at 60k
Reconditioned diff at 70k ish
Sold at 84k and now on a DS. Terribly unreliable.
Sold DS for a 2021 Mitsubishi Outlander PHEV. Fingers crossed....
Sold Outlander for a 2014 SD4 SE Tech because I’m mental

Post #358412 9th Oct 2018 5:18 am
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Lightwater



Member Since: 21 Aug 2014
Location: Sydney Northern Beaches
Posts: 4704

Ukraine 2013 Freelander 2 2.0T SE Auto Fuji White

Or one of these. I hadn't finalized my wiring for under seat batteries. So just plugged them into the cigarette lighter socket. 20 amp fuse, maximum draw I had charging up the batteries was 11 amps.

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 Procrastination, mankind's greatest labour saving device!

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Post #358419 9th Oct 2018 7:10 am
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