UPS mosfet kit keeps blowing

I need help. I have desi ups. it's mosfet kit is blown. UPS guy replaced it with new kit, I checked it was working fine. came to home and checked it and was working fine. At night when light goes it burnt again. What could be the reason??

Can you post the pic of the mosfet kit? and also of full ups showing all parts.

Short circuiting..

wiring overlap..

neutral issues.

moisture

etc.

[quote=“hashim5003, post:, topic:”]

I need help. I have desi ups. it's mosfet kit is blown. UPS guy replaced it with new kit, I checked it was working fine. came to home and checked it and was working fine. At night when light goes it burnt again. What could be the reason??

[/quote]

I had this issue with UPS , had to buy a non-desi. I have just my desi UPS has a 10 AMP fuse at input and that might be the issue.

if you do find an answer please share. I still have that UPS lying around.

[quote=“nasirjavaid, post:2, topic:21849”]

Can you post the pic of the mosfet kit? and also of full ups showing all parts.

[/quote]

MOSFETs in both kits are P75nf75.

Old module. It has MOSFET's blown. I think one side MOSFET's are good.

New module. Its one side resistor and MOSFETs are blown:

[quote=“hashim5003, post:5, topic:21849”]

MOSFETs in both kits are P75nf75.

Old module. It has MOSFET's blown. I think one side MOSFET's are good.

New module. Its one side resistor and MOSFETs are blown:

[/quote]

Bro use 10+10 module and it should be fine. Also clean the large kit as lots of dust can create shorts and leaks. use CTC. Also ask ups guy to sold extra wire under this module to provide extra path for high current.