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[Moved]Inverter problems please help

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Lexm

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Hi all
I have a 3000w inverter in my camper but when I'm at home I plug the camper into the mains to run a battery charger and keep fridge and frezzer on. when I got home the other day I forgot to isolate the inverter and when I plugged the camper in and blow the inverter. Having been a electrician I figured I'd have a go at fixing it. I thought I'd tracked the problem do to a irfp460 mosfet when I changed it out the inverter was working fine (no buzzer going off) but when I put it under load it went bang. So taking apart again I found that it had blown 3 resistors so I replaced them but now I'm only getting 130v when testing the socket any help,idea would be great

Forgot to add if it's any relevance I'm getting 330v dc from the dc side of the board.
 

I once did a similar thing with my power inverter, allowing a short circuit (I forget whether grid power was present in the house wiring). It stopped working. I opened it up found an MOV had burnt. I replaced the MOV and it worked fine after that. Evidently nothing else was wrong.
 

Lexm said:
Hi all
I have a 3000w inverter in my camper but when I'm at home I plug the camper into the mains to run a battery charger and keep fridge and frezzer on. when I got home the other day I forgot to isolate the inverter and when I plugged the camper in and blow the inverter. Having been a electrician I figured I'd have a go at fixing it. I thought I'd tracked the problem do to a irfp460 mosfet when I changed it out the inverter was working fine (no buzzer going off) but when I put it under load it went bang. So taking apart again I found that it had blown 3 resistors so I replaced them but now I'm only getting 130v when testing the socket any help,idea would be great

Forgot to add if it's any relevance I'm getting 330v dc from the dc side of the board.the make is dopower and the model number is GYMS3KW.
You can see the resistors I've changed in the pictures I ordered them online and when they came they were a lot bigger than I was expecting and help would be great .
Click to expand...
 

Hi thank you for your reply how would I go about test a mov and also how do I tell it's values if it need replacing sorry my electronic is very basic
 

MOV = metal oxide varistor. Conducts when voltage rises above a certain threshold. Used to protect neighboring components from excessive voltage.

My mov's looked like large blue ceramic capacitors.
I do not recognize any mov's (nor fuses) in your photos.
 

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