PortaPow USB Power Monitor/Multimeter/DC Ammeter for Solar Panels, Mains Chargers, PC
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- Plugs into any USB socket, shows the power (current and voltage) going from the socket to the device you're charging from it in real time.
- 0-3000mA (3A), 0-10V, Accurate to 0.01A, 0.01V. Uses <4mA (20mW) of power for the most accurate readout.
- Uses a switch to change the display between current and voltage. No need to wait 10 seconds for the display to change as with alternative products.
- 3 inch extension cable means you can turn the screen to face you regardless of how the USB socket is oriented
- LCD Display is easy to read indoors and in bright sunlight, unlike LED displays
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This multi-meter plugs directly into any USB socket and allows you to connect any USB cable into it for charging or data transfer. It displays on screen the voltage and current which is being output, acting as both a volt and amp meter. It is powered inline so no battery is needed, and uses low resistance components with <4mA power consumption for the most accurate readout.
A 3 inch extension flexible cable means you can turn the LCD screen to face you - it won't be fixed facing the floor/wall regardless of how the USB socket is oriented. It uses a large LCD display is easily visible both indoors and in bright sunlight, and uses a switch to let you choose between displaying current and voltage.
The meter is useful for solar panels with USB outputs, since it will then allow you to position the panel to maximize the energy it outputs, see what factors affect the panel's performance, and also to see when the output is too low to be worth using the solar panel.
It is also allows you to compare the power of different USB sockets and study the quirks of USB charging. It has an upper limit of 3A.
Top Customer Reviews
It is excellent!!! I use it with my portable solar panel and it helps me to adjust it at the right angle so that I can get maximum efficiency. I have also used it to check the output of portable back up battery packs such as TeckNet/Mili/EasyAcc. It works perfect in any occasion. So if you want to test any USB output your answer is Portapow tester. I have found two small negative things: one is the stiffness of the female USB extension cable(personally I would have liked a bit more flexible), and second the overall quality of the housing plastic of the unit which I believe has some space for improvement.
This unit shows voltage or current [easily switchable on front] to hundredths e.g. 0.69. Claims 0-3A but the highest I measured was 2.4A by iPad Air [USB voltage should always be near 5V]
Body of this unit is 7cm long with the cable [not including the USB plug] also being 7cm, display text height 1cm & weight 44g - unit does not take a battery and doesn't have a backlight
Tested with a Nexus 4 and iPad Air, using an iPad Air wall-wart charger [i.e. high current out] or a 1A wall-wart or a USB port on a Windows computer, along with several cables - Nokia micro USB, a cheapo extendable micro USB etc]
Watching current drawn vary when changing things e.g. switching screen on/off, was interesting :-)
The 'normal' micro USB cables [i.e. have data and power] all seemed to perform similarly -
iPad wall-wart: the Nexus 4 drew 0.82A when its screen off and 1.02A when on [figures jumped around a little]. The 'power only' cable was very similar [maybe slightly higher].
1A wall-wart: the Nexus 4 drew figures which spiked alot more [up to 1.35A with 'power only' and 1.25A with 'power and data'] though usually about 1.05A.
USB port on computer: the 'normal' USB cables all dropped to 0.45A but the 'power only' to 0.76A
For iPad [apple lightening connector], got 0.46A connecting to computer and 2.34A when connected to the iPad charger [same with screen on or off]. Also tried from iPad wall-wart using the 'power only' Micro USB cable with the official apple micro usb to lightning converter and got 0.Read more ›
And I love it. I don't know how much it's accurate but I have no doubts it works properly for my needs.
I paln also to buy the bigger brother.
Thank you Amazon!
Most Recent Customer Reviews
Wanted to use this to measure the power consumption of my USB devices.
It is a bit sad but I wanted to find out and was intriged by the usages of various items. Read more
Poor build quality means you have to be very careful when attaching/disconnecting this. Otherwise it appears to work as expected.Published 19 months ago by Tinman
Very useful, shows how different quality cables can affect the charge rate.Published 20 months ago by k blackmore
Cool little gadget for the "Engineer" type of person, that likes to know what's happening..!! Read morePublished 22 months ago by Trev_5
Great item to check whether your lighting lead is up to charging the later iPads.Published 23 months ago by Fox Valentine
Cheap, poor quality item and very poor customer service to top it off.
Didn't last long before becoming faulty and only working intermittently. Read more
Very handy when using with items that have no charge indicator. The charge adaptor on my Pebble watch can be a bit temperamental and this unit shows me all is connected ok.Published on 28 May 2015 by EssJay