Hi
I have a solar invertr : Felicity IVEM5048 
the unit is damaged (lost nutral from grid)
after testing the board I found :
4 Damaged Mosfets on INPUT side ( Mosfet : NCEP026N10)
4 Damaged Mosfets on OUTPUT side ( Mosfet : MIW75N65F)

I checked drive section  (resistors , npn+pnp transistors , optocoupler ... ) nothing damaged

I couldn't find the same mosfet equivalent for damaged parts , and the closest equivalent has lower Id paramiter (Drain Current-Continuous)
my question : can I replace mosfet with same voltage and Rds but with lower Id ?

On 2024/10/28 at 7:26 PM, vanguardviper said:

Hi
I have a solar invertr : Felicity IVEM5048 
the unit is damaged (lost nutral from grid)
after testing the board I found :
4 Damaged Mosfets on INPUT side ( Mosfet : NCEP026N10)
4 Damaged Mosfets on OUTPUT side ( Mosfet : MIW75N65F)

I checked drive section  (resistors , npn+pnp transistors , optocoupler ... ) nothing damaged

I couldn't find the same mosfet equivalent for damaged parts , and the closest equivalent has lower Id paramiter (Drain Current-Continuous)
my question : can I replace mosfet with same voltage and Rds but with lower Id ?

The FETs you need are available on aliexpress and other on line sellers. 

Edited October 29, 20241 yr by Scorp007

On 2024/10/29 at 4:53 PM, Scorp007 said:

The FETs you need are available on aliexpress and other on line sellers. 

I don't have access to online purchase where I am ...

and thanks for reply , but that was not my question !

I need to know if I can replace mosfets with deferent parameters , even if they are lower than originals .

the original mosfet has a current (Id) of max 200 amps , the closest I could find has 180 amps of max current .

 

1 hour ago, vanguardviper said:

I don't have access to online purchase where I am ...

and thanks for reply , but that was not my question !

I need to know if I can replace mosfets with deferent parameters , even if they are lower than originals .

the original mosfet has a current (Id) of max 200 amps , the closest I could find has 180 amps of max current .

 

Sorry I did not answer the question. I belief it is not good practise to downgrade component conducting high current like FETs. 

Just my 2c.

2 hours ago, Scorp007 said:

I belief it is not good practise to downgrade component conducting high current like FETs. 

Quite true in general. However, in this case, it's fanciful to expect to get 200 A through the thin leads on these TO-220 devices. So yes, a 180 A part should be OK. It should be rated for at least 80 V; 100 V will give better margins.

4 hours ago, Coulomb said:

Quite true in general. However, in this case, it's fanciful to expect to get 200 A through the thin leads on these TO-220 devices. So yes, a 180 A part should be OK. It should be rated for at least 80 V; 100 V will give better margins.

Thanks for the reply. 

May be I am too sensitive on FETs as we change a number of 84A FETs every day that feed 12V gate motors where the source is only a 7Ah battery. 

On 2024/11/01 at 2:48 PM, Coulomb said:

Quite true in general. However, in this case, it's fanciful to expect to get 200 A through the thin leads on these TO-220 devices. So yes, a 180 A part should be OK. It should be rated for at least 80 V; 100 V will give better margins.

Please my ivem5048 is not coming on where should I look and pay attention to am lost

7 hours ago, joshua said:

my ivem5048 is not coming on where should I look and pay attention to

The main power supply, especially the part that "bootstraps" it on, basically the part around the two transistors below from my traced schematic:

This circuit is usually near the large square yellow banded "transformer", as in the middle of this photo:

It could also be capacitors worn out in that power supply; see this post for typical replacements.

Thanks a lot man