Growatt SPF6000 ES Plus Base shorted with PV+ input HELP

[Strutter_]

I am moron! I acidentaly touch my inverters PV+ to Inverters base, i got spark, and now something is wrong, it draws crazy amount of current, at first my battery failed because of the current draw, btw screen and buttons woking. Than i disconnected everything and connected only generator, and i noticed that when inverter power up, after few seconds it starts to draw a lot of power from generator each second i guess, and i hear in inverter relay clicking, and than after few times generator braker pops, i disconnected MPPT from main board same thing. Also after first time when battery failed i smelled burned electronic component, does anybody have idea what i burned? I was trying to find by smell, also opened battery and found nothing, but on my old inverter battery is working just fine. So i believe and hope battery is fine.

 

[robbob2112]

Sounds like you let the magic smoke out... It can't be put back in other than replacing components or boards...

If you want to take it apart and take pictures to post we might have a better idea

 

[Strutter_]

Oh yeah, The genie has left the chat. So i was trying to take sniffing diagnostics, but didnt find anything, than i start to pay atention to details, and on PV mosfet side, i got one looking not cool.


Okey, moving forward i started to measture, and between gate and source, i got these results.


It kinda makes sense for me, first of row burned out, and took with it 3 more, and then rest of them are fine.
First 4 mofsets is P03N08 2249 PW than 8 is P03N08 2325 PW and than again 4 P03N08 2249.
Now there is no doubt that i can replace these. But locally i got only these ones.

Model	Max V	Max A	Rds(on)	Available
P03N08	80V	30A	~0.045Ω	Original
IRF3205	55V	110A	~0.008Ω	Yes
STP75NF75	75V	80A	~0.009Ω	Yes

So i was thinging about replacing all of them with STP75NF75 Transistor: N-MOSFET; STripFET™ II; unipolar; 75V; 70A; 300W
And would like to get some HA YEAH from you guys.

Also would be really happy if this is it, but what do you guys think? Can it be more of released genies there?

 

[efficientPV]

Are you going to replace them all? One thing to worry about is gate capacitance, that increases with current rating. Going double or triple in most cases doesn't matter. Parallel FET should have the same on resistance in parallel. Otherwise, the low one gets most of the current and has excessive heating. TO-220 have poor heat transfer. I have some 75N75 which will work. They are fake and have four times the resistance. I always test FET first for resistance. Just a brake light and 12V will be enough current to get a reasonable resistance measurement. I have some fake 3205 that I love. Nearly the same on resistance and they are 80V. Most of my work is around 60V.

 

[crossy]

I'd certainly replace them all, it's not as if they are megabucks.

Then get one of those device tester thingies so you can check the ones you took out, any you find good can go in the "for emergencies" box.

 

[Strutter_]

And what do you think guys, will it be safe to replace all of these mofsets and turn on device to check if it works? Asking for ar friend.

 

[efficientPV]

I'd remove the bad ones first and test it. The rest can handle a light load. Circuit board foils today are not designed to be repaired. It can take a lot of experience. I wouldn't replace them all willy nilly. High current foil paths can conduct away a lot of heat and long periods of solder heat can damage them. It may not look pretty but leaving a length of old lead and soldering the new part to that is the safest method.