Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-22-2019, 12:06 AM   #1
Guru
 
City: Anacortes
Country: USA
Join Date: Nov 2012
Posts: 695
USB outlets ghosting loads

I know many of you have recommended the convenience of ac outlets with built in usb for charging. Im about to put a few in. Before I go crazy and replace too many outlets, how bad is the power ghosting on the idle usb?

I’ve had significant power ghosting all around the boat with idle phone chargers and such in the past , so it occurred to me I might not want to go crazy.

Anybody put a meter on one and measured?

Thx
__________________
Advertisement

ghost is online now   Reply With Quote
Old 07-22-2019, 04:52 AM   #2
Guru
 
City: Melbourne, FL
Country: USA
Join Date: Dec 2014
Posts: 1,389
Leviton catalog number T5632 when not in use the draw is <50mW

Straight from Leviton tech support.
__________________

stubones99 is offline   Reply With Quote
Old 07-22-2019, 06:55 AM   #3
Guru
 
wkearney99's Avatar
 
City: Bethesda, MD
Country: USA
Vessel Name: Solstice
Vessel Model: Grand Banks 47 Eastbay FB
Join Date: Feb 2018
Posts: 847
There's more than one kind of USB power for charging phones. Some phones will take higher amperage, others will negotiate with the charger or use a special cable to use both higher wattage AND voltages. I generally find it's better to stick with using plug-in chargers instead. That and the USB socket is fragile. WHEN someone breaks it by jamming the cord in backwards you're stuck with replacing the WHOLE socket, not just an plug-in charger.

There are several ways to make the charging 'less obtrusive'. Like right-angle AC adapters and plug-in chargers (Anker makes nice ones). I'll dig up some links later.
__________________
-- Bill Kearney
2005 Eastbay 47 FB - Solstice
wkearney99 is offline   Reply With Quote
Old 07-22-2019, 08:05 AM   #4
Guru
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 1,503
I'm about to go the other way and install a couple of 12V sockets in order to use 12V USB chargers. We mostly charge at night and using 12V chargers allows me to turn off the inverter which uses about 40-50w just to be on. The small plug in 12V USB chargers have very little idle current and are very efficient.



Ken
kchace is offline   Reply With Quote
Old 07-22-2019, 09:06 AM   #5
Guru
 
dhays's Avatar
 
City: Gig Harbor
Country: United States
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 7,941
Quote:
Originally Posted by kchace View Post
I'm about to go the other way and install a couple of 12V sockets in order to use 12V USB chargers. We mostly charge at night and using 12V chargers allows me to turn off the inverter which uses about 40-50w just to be on. The small plug in 12V USB chargers have very little idle current and are very efficient.

I agree with you. I got the idea originally from CMS.

I have a few AC outlets that have USB outlets built in. They are fine but... It is a lot less efficient when using the inverter than a DC outlet. Also, the AC/USB outlets that I have do not fast charge an iPad or Google Pixel phone. If I am navigating and using my iPad for charting, the AC/USB outlets can’t keep up with the power drain.

I have a 12v adaptor that has three USB ports. Two will deliver high output charging and the third is the regular 1.2 amp output. If it burns out, it is easy and relatively cheap to replace. So far it has been working great for a year.
__________________
Regards,

Dave
SPOT page
dhays is online now   Reply With Quote
Old 07-22-2019, 10:59 AM   #6
Guru
 
City: Melbourne, FL
Country: USA
Join Date: Dec 2014
Posts: 1,389
Blue Seas makes some nice dual USB ports that run off 12v and can be fast charger capable if that's what you need.

https://www.amazon.com/Blue-Sea-Syst.../dp/B0082CXEI8
stubones99 is offline   Reply With Quote
Old 07-22-2019, 04:50 PM   #7
Guru
 
City: Anacortes
Country: USA
Join Date: Nov 2012
Posts: 695
USB outlets ghosting loads

Thanks everyone. I’m going to go with a couple ac outlets. I usually switch off all but one ac breaker at night, the remaining powers cpap. If I could run that on 12v, then i could just switch the inverter off at night, so much easier than hunting the ghosting loads that always creep back.

I like the 12volt usb idea too.
ghost is online now   Reply With Quote
Old 07-22-2019, 04:51 PM   #8
Guru
 
City: Anacortes
Country: USA
Join Date: Nov 2012
Posts: 695
Quote:
Originally Posted by ghost View Post
Thanks everyone. I’m going to go with a couple ac outlets. I usually switch off all but one ac breaker at night, the remaining powers crap. If I could run that on 12v, then i could just switch the inverter off at night, so much easier than hunting the ghosting loads that always creep back.

I like the 12volt usb idea too.


Ahem, autocorrect failure, that should have said cpap
ghost is online now   Reply With Quote
Old 07-22-2019, 05:26 PM   #9
Guru
 
City: Melbourne, FL
Country: USA
Join Date: Dec 2014
Posts: 1,389
CPAPNEA is when your CPAP mask wakes you up with a face fart or other leak...
stubones99 is offline   Reply With Quote
Old 07-22-2019, 06:22 PM   #10
Guru
 
City: Anacortes
Country: USA
Join Date: Nov 2012
Posts: 695
Doesn’t wake me up. The yelling I get for not waking up, THAT wakes me up.
ghost is online now   Reply With Quote
Old 07-22-2019, 07:28 PM   #11
Guru
 
tpbrady's Avatar
 
City: Gooding ID/Wrangell AK
Country: USA
Vessel Name: Silver Bay
Vessel Model: Nordic Tug 42-002
Join Date: Sep 2012
Posts: 574
I bought a USB hub that runs on 12VDC using a power supply. I cut the DC cord so I could use the connector and wired it direct to a fused switch panel with a 3 amp fuse. That gives me about 6 amps at 5VDC to charge multiple devices with no perceptible power draw with nothing plugged it.

Tom
tpbrady is offline   Reply With Quote
Old 07-22-2019, 07:43 PM   #12
Guru
 
Crusty Chief's Avatar
 
City: Las Vegas/West Coast
Country: USA
Vessel Name: Pairadice
Vessel Model: Selene 47
Join Date: Jul 2014
Posts: 1,459
I put both in a few places, but I tend to use the 12V outlet when cruising. Plug in Ipad, phones, battery chargers and such, you’ll be surprised how much juice you draw. Plus, the DC outlet has a VM and another outlet below for more stuff.
Attached Thumbnails
Click image for larger version

Name:	8233BC66-D280-4582-85A1-3F9BF7672834.jpg
Views:	45
Size:	130.7 KB
ID:	91362  
Crusty Chief is offline   Reply With Quote
Old 07-23-2019, 12:28 PM   #13
Senior Member
 
slowandsteady's Avatar
 
City: North Kingstown, RI
Country: USA
Vessel Model: Mainship 34 III
Join Date: Jul 2013
Posts: 172
USB outlets ghosting loads

Won’t the “cigarette lighter” socket ever go away? Has anyone ever put a cigarette lighter in their 12v receptacle on their boat? I would rather update the 3 I have to USB ports. That’s all they are ever used for anyway
slowandsteady is offline   Reply With Quote
Old 07-23-2019, 12:50 PM   #14
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 4,529
I replaced the cigarette lighter ones with dual cig lighter and 2 USB outlets. So far I have never use the cig lighter outlet but I do have a portable searchlight on board so I could plug it in on the flybridge. But really I have never used it since I have a really bright flashlight that usually works well instead of having to plug in the searchlight.
Comodave is online now   Reply With Quote
Old 07-23-2019, 01:32 PM   #15
Guru
 
wkearney99's Avatar
 
City: Bethesda, MD
Country: USA
Vessel Name: Solstice
Vessel Model: Grand Banks 47 Eastbay FB
Join Date: Feb 2018
Posts: 847
Quote:
Originally Posted by slowandsteady View Post
Won’t the “cigarette lighter” socket ever go away? Has anyone ever put a cigarette lighter in their 12v receptacle on their boat? I would rather update the 3 I have to USB ports. That’s all they are ever used for anyway
Again, not all USB ports are the same. 500ma, 1a, 2.1a, 9v, quickcharge, qualcomm, etc. The socket hardware has the same form-factor, but that's about it, standards-wise.

Using a 12v accessory socket is about the most future-proof option going. With it you can continue to use any kind of 12vdc-to-whatever adapter desired, and readily change it WHEN a flimsy USB socket gets broken. There's some nice flush-fitting ones that work great in a 12v socket.

That and almost none of these have been heat-proof 'cigarette lighter' sockets for more than a decade.
__________________
-- Bill Kearney
2005 Eastbay 47 FB - Solstice
wkearney99 is offline   Reply With Quote
Old 07-24-2019, 05:42 PM   #16
Senior Member
 
City: San Diego, CA
Country: USA
Vessel Model: 42' Uniflite Double Cabin
Join Date: Jul 2017
Posts: 121
I would add that for any 12V adapter, the really cheap ones will be more likely to have high idle power consumption and generally poor efficiency. I had one on a customer's boat that was drawing 2 amps doing nothing. Blue sea for dedicated/installed 12V to USB adapters are good. Anker brand for plug-in ones either AC or DC are good. Most adapters provided with Samsung, Apple are good as well.
sbman is offline   Reply With Quote
Old 07-29-2019, 12:50 PM   #17
Guru
 
ssobol's Avatar
 
City: Leesburg, VA
Country: United States
Join Date: Mar 2015
Posts: 650
I put in 12v to USB sockets in a number of places on my boat. They are 2.1a and can charge most phones and tablets. I also put in a separate 12v to 5v 5a DC to DC converter with separate plugs for charging/running a large tablet we use for entertainment.

Using a 12v source lets us use the USB plugs without an AC source.

The only thing I don't care about with the 12 USB sockets is that they are usually illuminated and the light is on whenever they have power. Some of the LEDs used for the indicator light are very (too) bright.
__________________

ssobol is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 12:37 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012