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help to fix my broken inverter

feckwithtech

Dec 30, 2017
7
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Dec 30, 2017
Messages
7
hi to all i have this inverter 12v to 230v for use on my boat its a modified sine wave it was working fine
but then it broke i noticed the negative terminal was really loose so i tightened it but no luck
(all the neg wires in pic were loose inside case crimped ring was rattling on studbar.)
now it keeps restarting and the 12v side lcd builds up to 13v but 230v lcd stays on 000 then flicks off and restarts
cant see any bulged caps or any burns the reverse of pcb is clean
I am unsure how to further diagnose i have a basic multimeter

looks like 20 mosfets ?
4 transistors
6 transformers
and caps
8 fuses look ok
 

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kellys_eye

Jun 25, 2010
6,514
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Fixing it is one thing but the fact that it isn't a pure sinewave should be of more concern as the modified sine wave could be causing damage to the equipment you're powering. Pure sine wave inverters have fallen dramatically in price and you really should consider this an opportunity to change the whole unit.

If, however, you want to stick with the existing unit we need more information and more pics. It's obviously a Chinese unit and the lack of make/manufacture/model doesn't bode well - potentially poor quality and questionable reliability.

Have you checked all the onboard fuses (green things)?
 

feckwithtech

Dec 30, 2017
7
Joined
Dec 30, 2017
Messages
7
havent checked fuses with multi but they look intact
your probably right i just saw a true sine 1000w cont for 80 on amazon
and 20 mosfets plus other components probably gonna add up quick
 

Delta Prime

Jul 29, 2020
1,971
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Jul 29, 2020
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1,971
noticed the negative terminal was really loose so i tightened it but no luck
(all the neg wires in pic were loose inside case crimped ring was rattling on studbar
After inspection,electronic equipment on the boat could possibly look on the inside as your description after a day navigating rough seas.
learning the principles of
severe weather seamanship
is the only way to navigate that harsh Mistress named Ocean. ;)
 

ramussons

Jun 10, 2014
464
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Jun 10, 2014
Messages
464
Check all those MOSFETs for shorts. That's the starting point.
 
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