Benchtop DC Power Supply Wanptek

[Haro274]

Been looking for a bench top tester that can charge my 4s 280ah lifepo4 12 volt battery as well as test individual cells, the cheaper units just seem to have low Amps and would take to long to do multiple cells (have 16 cells).
Was looking at this Wamptek KPS 1560D 15V/60a mdl, any thoughts?

148.98US $ 30% OFF|Bench Source Laboratory Dc Stabilized Power Supply Adjustable Variable Digital Regulated Power Supply 30v 20a 60v 10a Wanptek - Switching Power Supply - AliExpress

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[Haro274]

Thanks for the reply
Interesting that you can't set what you need.
Please check back in and let me know how it goes

 

[time2roll]

I've been using it all day. When I connect it to a cell with an ~40% charge, it will charge at 26 amps even if I have it set higher. It will reduce to fewer amps as the SOC increases. It is working for me to prep each cell for the next discharge test with my EBC A40L capacity tester.

Have you checked the battery terminal voltage vs the supply output voltage? You may need some heavier cables to get 60 amps.

 

[Haro274]

I did think that these chargers were suppose to start dropping the amps as the voltage rises?

 

[time2roll]

I did think that these chargers were suppose to start dropping the amps as the voltage rises?

The change in battery potential changes the circuit calculation and the amps drop.
Charging source just makes the power available and does not control the drop in current.

 

[Just John]

I have the 30v at 40 amp version. It runs hot, but works fine. How many amps depends on the cables and connectors used. I also have the Tekpower 15v at 40 amps, it does not run hot.

The closer you are to set voltage, the less amps (ohms law). A fully discharged cell will get 40 amps no problem, but it will spend the majority of time at 30 to 20 amps using 8 gauge wire and ring terminals or good lugs. Mine has no problem being set to 3.65v.

 

[Just John]

I thought I should expound on the "it runs hot". Remember, this is the 30v at 40 amps version, and this was taken while putting out 40 amps for a single cell (i.e. under 3.65v). If you are familiar with a 1u server fan, same pitch, just not as loud.

148.98US $ 30% OFF|Bench Source Laboratory Dc Stabilized Power Supply Adjustable Variable Digital Regulated Power Supply 30v 20a 60v 10a Wanptek - Switching Power Supply - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

Model 3040D (FYI, temperatures are in Fahrenheit)

 

[frankthetank907]

I know this is quite an old thread, but I just picked up one of these power supply's, got the 60 volt 20 amp version. Have any of you had an issue with your unit where it makes a fairly loud buzzing sound from the transformer when set near or at it's raided max current output? Mine does when set any higher than 10 amps, and it gets louder the higher I have the amperage set, currently talking to the seller on aliexpress to see if I can get a replacement as it is super annoying. Not sure if they are just pushing the transformer super hard, or if there is some sort of internal issue.

 

[frankthetank907]

I used my thermal camera after taking the lid off and everything is staying fairly cool, the only thing that is fairly warm is a ceramic resistor that is in front of the transformer and it is only 170 degrees Fahrenheit everything else is below 130, and the transformer is hardly heating up at all