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Posts Tagged ‘charging’

How USB Cables Affect Charging – Simple Test

I came across an interesting article today from Dr Gough, a tech nerd. and thought it good enough to summarize here:

The USB specifications for power from a port vary from 100mA to 1.5A and up to 100W of power for USB Type C, but the cables and connectors used in a cable might not align with the power specifications of the product being designed and used. Cables are typically rated for about 1.8A of current, which is most common for cables used for charging.

usb cable

The 1.8A rating is based on safety limits for resistive heating of the cable and connectors. The rating is no guarantee your +5V at 1.5A setup will get you the maximum level of power. The important point here, the cable and connector combination is simply a rating to deal with heat, and ensures nothing melts. Going a step further, most specs ensure nothing gets noticeably warm to the human touch.

Every wire that’s not a superconductor has some finite resistance. Said another way, resistance is transferred into heat. Ohm’s law tells says that E = IR, where E is voltage, I is current, and R is resistance. So when you put power through a wire, the current X resistance gives me the voltage that will be “consumed” across that wire, power that turns into heat, and thus, never makes it to your phone.

I want to end this blog post with the above paragraph as that is the real takeaway here. The more inefficient (or cheap) a cable is, the warmer it will get. So if your iPhone cable is warm to the touch, it sucks. If your wire charging your power bank is warm, it sucks. Get a better cable. From what I can tell, there is no rating posted on all these cables you see on Amazon at cheap prices, so word to the wise using your tactile feel!

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Commercial Grade USB Solar Charging Station

Legrand now offers the XSOLARCS USB charging station for public works, schools, parks and transportation centers.

With the Legrand solution, there is no construction required in order to install the charging station. The unit is a self contained solar panel tower, with six USB charging ports pulling from the solar panel. There are three shelves which can mount in adjustable locations to the panel tower poll. Each shelf containes two USB ports with up to 3.1A of shared power between them. There is no trenching required or other expensive construction projects in order to get the EXSOLARCS going.

USB sockets are protected from the eliments with a sliding door in front of the two port socket assembly. Not only is there protection, but LED illumination at each port for after-dark identification and ease-of-use. If the light is illuminating, the station can provide a charge. This implies there is some type of battery inside the station, which we’ve emailed Legrand to find out exactly what.

The XSOLARCS was designed with the elimints in mind. The USB charging station is designed to withstand hurricane-force winds and has the full RoHS certificate compliance.

Source: Legrand .

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Our Answer to a Smartphone / Tablet Dock Charging Station

With the iPhone in its 8th iteration of the product and most likely you have some older models laying around. Those older models can be put to use, but chances are, you don’t keep them charged up. So after a couple of days without connection, they are dead. I currently use an older iPhone to stream my music at work. I don’t stream from my phone, because I always seem to get disconnect to the Bluetooth speakers after I take a call. USB charge dock station This is why I like the 10 port charging station from USBFever. It’s got a logical design for holding ten devices. With the USB ports on the bottom, it keeps the plugs from hanging off the wall. Just above the USB ports are hollow channels you can bundle up the USB cable and stash it away. On top are vertical channels to hold your iPhone, iPad, Smartphone or tablet. The vertical channels are tall enough the devices will sit sturdy and proper. Finally, the design includes a good balance of power output for the devices. There are a total of 10 USB ports. Eight of which push out a 2.5amp power supply and the remaining two are 1amp. This means the charging dock station will power the tablets as well as the larger iPhone and Samsung product while you can leave the smaller phones to the 1amp channels. The default color is Continue Reading

USB Battery Charging – Not An Easy Task

USB devices and ports are now the most ubiquitous item one can related to a computer product other then maybe the VGA connector or Ethernet port.  With that said, it’s now the mainstream bus used to power and recharge most computer devices and gadgets.  However, just because it will charge of USB doesn’t mean it’s all that easy and efficient.  There is a lot more into charging via USB then you’d ever imagine. With some devices you get a fast charge.  With other devices you get a slow charge.  So what’s the deal? In most cases when you see a slow charging device it means the manufacturer made a digital signature that is compatible with the power charger which came with the device.  Any other USB port used to charge the product simply isn’t as efficient…and that’s by design! This post is just an appetizer for all the dirty little secrets related to USB charging devices, to get a little deeper into the details click over to Continue Reading

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