Hello,

First, sorry for my bad english.

I Have a Step Down converter DC from 8-60V to 1-36V continously. It named :
200W 15A DC Buck Step Down Converter Wide In 8-60V to 1-36V Adjustable.

So here's the problem :

I have a LiFePo4 Battery from my Electric Bike, it's battery specs is 48V 10Ah.
I wanted to step down it to around 24Volts, so i bought stepdown.

After received the product, i'm going to test it out. from the battery i connect + to "IN+" to the product and - to "IN-".
(The battery voltage now is 50Volts)
then, i connect the output to my multitester.

I turned it on, the red led indicator from the product is turned on. the multitester jumped to 50Volts. Strange. the specifications shows only 36V max. Yeah there's a trimmer, but all i know if i turn the trimmer to increase it's volt output, when it reach 36v it should be still 36V. (when i test it i dont change the trimmer, yet)

after 10 seconds, suddenly the one of capacitors explode. I panicked and turned that thing off.

I asked the seller, seller says "the polarity is wrong" but im VERY SURE the polarity is correct.

What if i put wrong polarity?

There is 4 capacitors on it,
2 capacitor near IN socket, 220uF 63V, and
2 capacitor near OUT socket, 470uF 35V.

the strange is : assume you put wrong polarity on it, the result should be 2 or 1 capacitor near IN socket blew off, but in my case the capacitor near OUT socket explode.

So is the controller or IC the product defective or something? is it my fault or vendor's fault? My friend says it's Chip fails/defect so it doesnt step down, then made the Out caps explode.

i need your answers, to prove it to the seller to get replacement.
Here is the pics.


MOD NOTE: Links removed

 

Hi,

Please upload your images to this site. When I clicked your links, I got an error message that said a script stopped responding. The script wanted to redirect me to a site with a content that is not suited for all.

 

Hi,

Please upload your images to this site. When I clicked your links, I got an error message that said a script stopped responding. The script wanted to redirect me to a site with a content that is not suited for all.

Hello, ok i'll try to upload to this site. Im trying it before and firefox shows "this page made a slow down" and there is a button " wait" and "stop", i clicked wait, after 15 min it still doesnt respond anything so i clicked stop and upload image via prtscr site. (prtscr is image sharing websites)

 

Here



And this (left caps blow up)

 

Your converter may require a minimum output load current in order to function correctly (the datasheet ought to say so if that is the case). Your multimeter draws negligible current, so can't pull the volts down enough.