Installing USB ports

weemalkie

weemalkie

Joined
Nov 1, 2021
Posts
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Location
Lanarkshire, Scotland
Funster No
85,214
MH
Burstner IXEO Time
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Complete newbie
Hi all, I'm hoping someone can put me right on the correct cable size and fuses to use when installing USB ports.
I have identified a 12v supply on my EBL 119 from a outlet (Spare 6) on Block 8 and plan to install 2 double 2.1A USB sockets. According to the Schaudt electrical diagram the maximum fuse size should be 15Amp which I have fitted. I'm hoping to run a twin cable and connect both ports. I'm assuming that if all ports are in use the maximum power will be 8.4 amp so the 15amp fuse more than adequate - or should I make it 10amp? Also planing to use either 1.5 or 2.5mm2 cable. Also do I require further fuses on the positives to both ports and if so what size? Doing the install no problem but as I'm obviously no electrician I want to make sure that whatever I do is correct and safe. Many thanks.
 
I have seen some that say fast charge usb do they need bigger cable if your getting those ones. No idea I am the same as you no electrician
 
I saw this last night and thought it worth sharing in case anyone is looking for an external option. Easy DIY job
 
weemalkie said:
. I'm assuming that if all ports are in use the maximum power will be 8.4 amp
Click to expand...
Thats at 5v the 12v draw will be around 3.4 amps.

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Lenny HB said:
Thats at 5v the 12v draw will be around 3.4 amps.
Click to expand...
On course Lenny forgot that the voltage is reduced. Unfortunately that means that I need to use a heavier cable to reduce the voltage drop. One of the USB's will be on the same side of the van as the ELB with a max run of approximately 2 -3 metres. Second will be piggy backed and on the other side of the van an additional 2.5 metres away. If I take the total distance as being 5 mtrs and using the voltage drop calculator then I need to use 4mm2 to be below 3% or 3mm2 to get 4.1% drop. So look like 4mm2 cable then?
 
weemalkie said:
Unfortunately that means that I need to use a heavier cable to reduce the voltage drop.
Click to expand...
Other way round voltage drop is less of a problem as you are drawing less current, also as the socket is converting 12v to 5v it won't matter if you have quite a big volt drop.
2.5mm sq will be fine.
 
don't waste your money on the cheap Chinese 2.1a and 1a double sockets. They have a nasty habit of overheating and melting. Go with a brand name and QC3 minimum. They charge faster and are backward compatible with older stuff. I can recharge my phone in 2 hours rather than 6 or 8
 
I fitted an extra 6 way fuse block direct from leisure batteries in-line supply fuse 15amp, cabled three individual cables to twin usb sockets each fused 2amp others to 12 volt sockets etc. Saved connecting into ebl.

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TheBig1 said:
don't waste your money on the cheap Chinese 2.1a and 1a double sockets. They have a nasty habit of overheating and melting. Go with a brand name and QC3 minimum. They charge faster and are backward compatible with older stuff. I can recharge my phone in 2 hours rather than 6 or 8
Click to expand...
Wot he said 👍
 
TheBig1 said:
don't waste your money on the cheap Chinese 2.1a and 1a double sockets. They have a nasty habit of overheating and melting. Go with a brand name and QC3 minimum. They charge faster and are backward compatible with older stuff. I can recharge my phone in 2 hours rather than 6 or 8
Click to expand...
Which brands would you recommend ?, thought most were made in China.
 
TheBig1 said:
don't waste your money on the cheap Chinese 2.1a and 1a double sockets
Click to expand...
I've bought double 2.1 sockets. The one I have in the motorhome seems to work OK. If they don't live up to expectations then I will change them. Many thanks
 
Stewart J said:
I fitted an extra 6 way fuse block direct from leisure batteries in-line supply fuse 15amp, cabled three individual cables to twin usb sockets each fused 2amp others to 12 volt sockets etc. Saved connecting into ebl.
Click to expand...
My existing USB was fitted when I bought the motorhome and it is connected directly across the leisure batteries. It cannot be switched off and is a continual drain on the battery - albeit small but significant. Thats the reason I wanted to control everything through the EBL. As it turns out connecting to the EBL is quite easy as far as access etc is concerned so quite happy to go along that way. Many thanks for your reply.
 
This is the latest one I'm fitting. When switched off it takes zero power 👌
Oh and it's made of alooooominum 👌

Screenshot_20220225-001601_eBay.jpg

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Richard n Ann said:
This is the latest one I'm fitting. When switched off it takes zero power 👌
Oh and it's made of alooooominum 👌

I’ve bought the 2.1 amp version but like the look of these. May change if these ones don’t live up to expectation. Many thanks.
Click to expand...
 
Many thanks to everyone who has replied to my post. Everything is sorted, know what I’m doing- he says- just waiting on parts. Easy route from EBL so it should be straight forward. Really appreciate the input from this forum. The wealth of knowledge and experience is phenomenal.
 
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Stewart J said:
I fitted an extra 6 way fuse block direct from leisure batteries in-line supply fuse 15amp, cabled three individual cables to twin usb sockets each fused 2amp others to 12 volt sockets etc. Saved connecting into ebl.
Click to expand...
I forgot to add each of the usb sockets is individually switched so no current draw when not in use

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