Test/Review of 40W 5V 8A 5 Port F8J088

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HKJ
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Test/Review of 40W 5V 8A 5 Port F8J088
USBpower 40W 5V 8A 5 Port F8J088

DSC_0415

Official specifications:
  • Input: AC100-240V
  • Total Maximum Output: 5V/8A
  • Quantities of the charging port: 5-ports
  • Dimension: 91*58*26mm
  • Weight: 110g

I got it from ebay dealer gocisco

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Being from ebay I got it in a envelope.

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Measurements
  • Unloaded power consumption is 0.2 watt
  • Usb output #1 is coded as Apple 1A
  • Usb output #2 is coded as Apple 2.1A
  • Usb output #3 is coded as Samsung
  • Usb output #4 is coded as USB charger (DCP)
  • Usb output #5 is coded as USB charger (DCP)


40W-5V-8A-5-Port-USB-Hub%20F8J088%20%231%20load%20sweep
40W-5V-8A-5-Port-USB-Hub%20F8J088%20%235%20load%20sweep

The ports looks the same and without individual overload protection.

40W-5V-8A-5-Port-USB-Hub%20F8J088%20load%20sweep

Running all ports together shows that there is a common overload protection at about 7.5A.

40W-5V-8A-5-Port-USB-Hub%20F8J088%207A%20load%20test

The charger is rated for 8A, but with overload protection at 7.5A that is impossible. I did first test at 7A and the charger could only maintain output for about 10 minutes before it shut down.

40W-5V-8A-5-Port-USB-Hub%20F8J088%206A%20load%20test

Reducing the load to 6A made it possible to run for 1 hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2145

M1: 55,6°C, M2: 41,9°C, M3: 53,2°C, HS1: 79,4°C
HS1 is the transformer and the heat around it is from the heatsinks.

Temp2146

M1: 54,8°C, M2: 68,5°C, HS1: 69,6°C
HS1 and M2 is the nend of the heatsinks.

Temp2147

M1: 69,5°C, M2: 70,9°C, M3: 49,2°C, HS1: 71,2°C

Temp2148

M1: 74,0°C, M2: 36,0°C, HS1: 85,3°C
HS1 is the from the lefs of the rectifier diode.

10ohm

There noise is acceptable with 12mV rms and 380mVpp.

5ohm

Increasing the current to 1A do increase the noise a bit 32mV rms and 450mVpp.

2ohm

At 2.5A the noise is at the same level 28mV rms and 450mVpp.

0.8ohm

And also at near maximum load: 33mV rms and 445mVpp.



Tear down

DSC_2352

Mounting the dark part in my vice and hitting the white part with a mallet did open it without any damage.

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On this side of the circuit board is mains input fuse and a bridge rectifier. The mains switcher transistor is moundted on a heatsink.
There is a opto coupler and a safety capacitor between the mains and the low volt side.
On the low volt side there is a rectifier diode with a large heatsink.
But there is no noise filtering neither on the mains input or on the usb outputs (No common mode coils or inductors).

DSC_2354

On the bottowm the mains switcher controller can be found (IC1). The usb ports has a couple of coding resistors.
The feedback circuit do not use a IC, but only a transistor (Q1).

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Somebody left a solder blob on the safety capacitor..

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When there is a air-gab the distance between mains and low volt side can be down to 4mm, here it is 2mm and a spark jumped accross it when I tested with 5000 volt. The two heatsinks are also too close.


The charger passed an isolation test with 2500 volt, but failed a 5000 volt test, this makes the charger acceptable for 120VAC usage, but doubtful for 230VAC usage.



Conclusion

At first glance this charger may look like many other 5 ports chargers, but this one is not nearly as good. Only fixed codings on the output, cannot deliver full current and worst of all it is not safe.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Splott-Light
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HKJ,

Many Thanks for weeding out the equipment that is less worthy of spending our hard earned cash on.

This is Definitely Not One For My Shopping List!

We do hold your testing and opinions in High Regard.

Keep up the Good Work Please Smile

Cheers,
S-L.

Ouchyfoot to a New Member: Welcome CJ. Now you have to learn about buying an inexpensive flashlight and modifying it until it either blows up, or starts small fires on the moon…………

Hugh Johnson:
I, too, once lived a tragic and empty life. Then I found [portable] light.
You forgot to mention clothes. I sold most of my clothes to fund my light collection. This is actually fine, since I only go out after dark, and most people can’t see me.
Finally, I got my priorities straight.

djozz
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Thanks for another good USB charger review. Without these reviews I would never dare to buy and trust a chinese charger from an unknown brand. And I can imagine that your reviews influence the amount of good and safe chargers being made.

unknown00101
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I've been wanting to pick up a multiport USB Charger. Fast 2.1A isn't really important to me (If it has it, cool, if not, no big deal). 3-6 ports is fine.

Do you have a safe one you would recommend?

HKJ
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unknown00101 wrote:

I've been wanting to pick up a multiport USB Charger. Fast 2.1A isn't really important to me (If it has it, cool, if not, no big deal). 3-6 ports is fine.

Do you have a safe one you would recommend?

My index with safety grading is a good starting place: http://lygte-info.dk/info/ChargerIndex%20UK.html

You can start by looking for BlitzWolf and Anker

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

unknown00101
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HKJ wrote:

unknown00101 wrote:

I've been wanting to pick up a multiport USB Charger. Fast 2.1A isn't really important to me (If it has it, cool, if not, no big deal). 3-6 ports is fine.

Do you have a safe one you would recommend?

My index with safety grading is a good starting place: http://lygte-info.dk/info/ChargerIndex%20UK.html

You can start by looking for BlitzWolf and Anker

I did just that. I think I've landed on an Anker 5 port. Thanks a lot. Smile

Also didnt know you had an index, very cool.

Shadowww
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Solder blob on safety capacitor could fall off and cause short circuit, no?

HKJ
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Shadowww wrote:
Solder blob on safety capacitor could fall off and cause short circuit, no?

Yes, that is a real risk if you drop it.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/