have a 400 watt power inverter. no load attatched to the output
i plug it in. all is good. i hit the power button. INSTANT BANG and smoke comes pouring out the rotating fan
the light is on so its still thinking that its "on"
checked voltage output and it was giving really erratic readings. it half-worked if i plug in a small phone charger adapter the voltage goes from 60v to around over 200v which is barely within spec of the AC adapter
so i stripped the case down and two power input mosfets were popped and crumbled to dust (they broke off into pieces when i slide out the circuit board from the aluminum housing.)
i can still read the model numbers so I could theoretically replace them but i dont think its worth it. it was only a 24$ inverter anyways
i know for a fact the inverter worked previously just fine. i was using it to run my computer just a few weeks earlier. got done with it. and let it sit.
so it just mysteriously goes bang no reason in sight.
everything else checks out okay. I think i actually do have four mosfets already to choose from somewhere in the house as long as they are the right polarity.
I have no idea what happened!
I just hit the power on switch and BANG and horrid stinky smoke comes pouring out the fan exhaust. Yuck!
Its pretty useless now. all I can really use it for is a 12v to 5v usb adapter
I think im just going to strip it down for spare parts and take the fan for another project
i'm gonna get a 400w pure sinewave power inverter from amazon for 36$ because i need to have a backup power source
i have no idea why it just mysteriously died like that it really makes no sense. i couldn't find any fault anywhere else on the circuit board
No other components or capacitors or anything seemed bad
the control circuitry was still working because the other two mosfets were still able to drive the transformer and give AC output (although the voltage regulation on the output is really bad)
Also strangely the 40 amp fuse didn't blow!! It should of but it didn't! What on earth??
i plug it in. all is good. i hit the power button. INSTANT BANG and smoke comes pouring out the rotating fan
the light is on so its still thinking that its "on"
checked voltage output and it was giving really erratic readings. it half-worked if i plug in a small phone charger adapter the voltage goes from 60v to around over 200v which is barely within spec of the AC adapter
so i stripped the case down and two power input mosfets were popped and crumbled to dust (they broke off into pieces when i slide out the circuit board from the aluminum housing.)
i can still read the model numbers so I could theoretically replace them but i dont think its worth it. it was only a 24$ inverter anyways
i know for a fact the inverter worked previously just fine. i was using it to run my computer just a few weeks earlier. got done with it. and let it sit.
so it just mysteriously goes bang no reason in sight.
everything else checks out okay. I think i actually do have four mosfets already to choose from somewhere in the house as long as they are the right polarity.
I have no idea what happened!
I just hit the power on switch and BANG and horrid stinky smoke comes pouring out the fan exhaust. Yuck!
Its pretty useless now. all I can really use it for is a 12v to 5v usb adapter
I think im just going to strip it down for spare parts and take the fan for another project
i'm gonna get a 400w pure sinewave power inverter from amazon for 36$ because i need to have a backup power source
i have no idea why it just mysteriously died like that it really makes no sense. i couldn't find any fault anywhere else on the circuit board
No other components or capacitors or anything seemed bad
the control circuitry was still working because the other two mosfets were still able to drive the transformer and give AC output (although the voltage regulation on the output is really bad)
Also strangely the 40 amp fuse didn't blow!! It should of but it didn't! What on earth??
It's a well-known principle that the transistors blow first, to protect the fuse.
Sounds like a really cheap design, maybe marginal parts and it was just a failure waiting for a time to happen.
Sounds like a really cheap design, maybe marginal parts and it was just a failure waiting for a time to happen.
If two died together without excessive current flowing anywhere else and destroying anything else my first guess is they are complementary transistors that wrongly turned on at the same time.
Yeah I dont see anything else that failed.
I usually use it with a small 5AH 12v SLA AGM battery
but this time it was hooked up directly to a 100AH 12v flooded lead acid battery
I guess the inrush current when starting was too much or something and it was too big of a battery and it didn't know what to do so it just went BANG
🙁
it has a 40 amp fuse and its rated for 1000 watts peak surge current.
I cant be bothered trying to replace the two mosfets its not worth it i'll just buy a brand new inverter of a different brand and it will be pure sinewave type! No more modified sinewave for me!
At least I can take the fan out of it and use it for some project i guess if I cant do anything else with it.
the USB 5v outputs still work. so I guess I could strip out the transformer and the rest of the mosfets and turn it into a glorified 5v USB power supply ran from 12v. with two 2.1A USB 5v outputs. if I wanted to.
I usually use it with a small 5AH 12v SLA AGM battery
but this time it was hooked up directly to a 100AH 12v flooded lead acid battery
I guess the inrush current when starting was too much or something and it was too big of a battery and it didn't know what to do so it just went BANG
🙁
it has a 40 amp fuse and its rated for 1000 watts peak surge current.
I cant be bothered trying to replace the two mosfets its not worth it i'll just buy a brand new inverter of a different brand and it will be pure sinewave type! No more modified sinewave for me!
At least I can take the fan out of it and use it for some project i guess if I cant do anything else with it.
the USB 5v outputs still work. so I guess I could strip out the transformer and the rest of the mosfets and turn it into a glorified 5v USB power supply ran from 12v. with two 2.1A USB 5v outputs. if I wanted to.
It can probably be made to work again by replacing some parts, maybe using stronger FETs, maybe to have a spare unit and learn some concepts about how it works, the input section is usually a push-pull, same for sinewave models. Some inverters get damaged when polarity is momentarily inverted, then there is a little smoke party on next power up. Post pictures allowing to identify circuit and components in case you want to repair it.
i never put it in reverse polarity and the last time i used it. i didnt either. and it was working fine.
it simply went BANG all on it's own!!!
if it went bang once in normal operation it's likely to go bang again even if I replace the mosfets..
They were so exploded they just crumbled into dust when i took them out
It partially worked but i had to adjust the voltage with the potentiometer to compensate for half the voltage. so the two mosfets that were left are doing twice as much work
I gave up and it was stinking so bad so I just threw it out and stripped and saved spare components out of it like fan for some other project
and already purchased a new PURE SINEWAVE inverter of better quality.
one half of the mosfet bridge went bang. two mosfets died. the other two are intact.
the bad thing is the fuse didn't blow. instead the mosfets blew.
so who knows what else went wrong with it.
ALSO I keep getting connection refused randomly when browsing on this website.
any ideas why?
it simply went BANG all on it's own!!!
if it went bang once in normal operation it's likely to go bang again even if I replace the mosfets..
They were so exploded they just crumbled into dust when i took them out
It partially worked but i had to adjust the voltage with the potentiometer to compensate for half the voltage. so the two mosfets that were left are doing twice as much work
I gave up and it was stinking so bad so I just threw it out and stripped and saved spare components out of it like fan for some other project
and already purchased a new PURE SINEWAVE inverter of better quality.
one half of the mosfet bridge went bang. two mosfets died. the other two are intact.
the bad thing is the fuse didn't blow. instead the mosfets blew.
so who knows what else went wrong with it.
ALSO I keep getting connection refused randomly when browsing on this website.
any ideas why?
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