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Old 24-05-2013, 20:05   #1
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12v USB Powerstrip Recommendations?

I've been searching for a 12v strip with maybe 4 usp ports and 2 traditional cig lighter type plugs. For wiring to my main panel, something of good quality.

Any recommendations?

Thanks
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Old 24-05-2013, 20:49   #2
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Re: 12v USB Powerstrip Recommendations?

We have lots of devices that are powered by usb and wanted a powered usb hub for quick full power chargeing. We are using a 12v powered 4 port usb hub from StarTech:
Amazon.com: StarTech.com Mountable 4 Port Rugged Industrial USB Hub (ST4200USBM): Electronics

Or 7 port:
Amazon.com: StarTech.com Mountable Rugged Industrial 7 Port USB Hub (ST7200USBM): Electronics

Or 7 port with usb 3.0. These are new and I may have to have one:
Mountable 4 Port Rugged Industrial SuperSpeed USB 3.0 Hub : Desktop Accessories | Dell

They work great but you probably wont find a powered hub with 12v plugs built in. You could combine one of the StarTech hubs with a couple of these:
12 Volt Dash Socket - Blue Sea Systems
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Old 25-05-2013, 06:23   #3
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Re: 12v USB Powerstrip Recommendations?

Slacker,
Thanks...

I checked those out, I was thinking usb for charging gadgets only.
Most phones, tablets etc come with usb connectors to cig lighter or wall chargers.
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Old 25-05-2013, 07:55   #4
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Re: 12v USB Powerstrip Recommendations?

I've been popping in extra cig lighter sockets. One of our local surplus places has the lighter-USB adaptors for under $5. I think this is the simplest solution overall, since the plug-in adaptors are complete with fuses.

Also, I removed a duplex USB socket from a discarded motherboard which I'm going to mount into our DC panel, and again the handy surplus shop provided efficient 12v-5v converters for cell-phones for like $1. Requires soldering obviously, and an inline fuseholder.
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Old 25-05-2013, 08:14   #5
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Re: 12v USB Powerstrip Recommendations?

Are you aware that USB (2.0/3.0) ports operate on 5 VDC NOT 12 VDC? Mauritz
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Old 25-05-2013, 08:36   #6
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Re: 12v USB Powerstrip Recommendations?

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Originally Posted by Teknav View Post
Are you aware that USB (2.0/3.0) ports operate on 5 VDC NOT 12 VDC? Mauritz
Good point.

to get extra USB power points I broke down a cigarette lighter connection that had 2 x 12 V Cig outletts and 2 x USB. The two cig outlets never worked very well as they heated up, and one would cause whatever was chargomg to have fits.

Breaking down the USB part of the unit allowed me to take the 12V connection and the converter into 5 volts and use it in normal 12 volt wiring. In my case I added it to the fan wiring in my cabin (on a different curcuit thaan the 12 V Cigarette sockets).

Its not an elegant solution in looks.... but it finctions.
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Old 25-05-2013, 08:50   #7
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Re: 12v USB Powerstrip Recommendations?

...and make sure that your COMBINED toys, when connected at the same time, do not require more than 5 A from that cable, preferably less! Mauritz
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Old 25-05-2013, 09:07   #8
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Re: 12v USB Powerstrip Recommendations?

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...and make sure that your COMBINED toys, when connected at the same time, do not require more than 5 A from that cable, preferably less! Mauritz
Thanks for the reminder.
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Old 25-05-2013, 10:19   #9
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Re: 12v USB Powerstrip Recommendations?

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Originally Posted by Teknav View Post
Are you aware that USB (2.0/3.0) ports operate on 5 VDC NOT 12 VDC? Mauritz
The other problem is some devices especially the apple products require a code voltage on the data pins. Without this they will not charge (or only charge very slowly)
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Old 25-05-2013, 13:28   #10
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The other problem is some devices especially the apple products require a code voltage on the data pins. Without this they will not charge (or only charge very slowly)
Care to elaborate , I've not seen it called that , what you may be saying is that a device requiring more then 100mA is supposed to negotiate a USB handshake. However the trend in all apple devices is to take as much as the charger provides

Or are you talking about the 2.75V needed on the D+/D- pins ? , this is how apple detects the charger attached. ( easily spoofed up with a few resistors by the way )

Dave
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Old 26-05-2013, 01:09   #11
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Re: 12v USB Powerstrip Recommendations?

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Care to elaborate , I've not seen it called that , what you may be saying is that a device requiring more then 100mA is supposed to negotiate a USB handshake. However the trend in all apple devices is to take as much as the charger provides

Or are you talking about the 2.75V needed on the D+/D- pins ? , this is how apple detects the charger attached. ( easily spoofed up with a few resistors by the way )

Dave
Yes spot on ( although it is in 100MA steps up to 500mA. So you will generally get 500mA out of a simple socket wired with 5v on the power pins).

The voltages on the data pins are different depending on the power that the the USB socket can provide.
Thus the voltage tells the iPad what current it can draw. 0.5,1.0, or 2.1A.

Without these voltages the iPad will only draw 500mA which won't charge the battery while operating.

Apple have not officially released the voltages, but they are easy found on the web. Using a couple of resistors to the data pins suitable voltages can be generated and the device will charge at the full 2.1A.
A USB socket wired like this will work fine with non apple products.

I believe Samsung do the same thing (and fortunately use the same voltages) with some of their tablets.
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Old 26-05-2013, 02:03   #12
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Quote:
Originally Posted by slacker View Post
We have lots of devices that are powered by usb and wanted a powered usb hub for quick full power chargeing. We are using a 12v powered 4 port usb hub from StarTech:
Amazon.com: StarTech.com Mountable 4 Port Rugged Industrial USB Hub (ST4200USBM): Electronics

Or 7 port:
Amazon.com: StarTech.com Mountable Rugged Industrial 7 Port USB Hub (ST7200USBM): Electronics

Or 7 port with usb 3.0. These are new and I may have to have one:
Mountable 4 Port Rugged Industrial SuperSpeed USB 3.0 Hub : Desktop Accessories | Dell

They work great but you probably wont find a powered hub with 12v plugs built in. You could combine one of the StarTech hubs with a couple of these:
12 Volt Dash Socket - Blue Sea Systems
That one with USB 3.0 is a 4 port hub. i have it (from Amazon.com) and can recommend it. Industrial quality, connects straigh to your battery. I also have an Ethernet switch from the same brand with the same setup that I use for Navnet3D (radar, plotter, computer).
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