As a service engineer I have seen hundreds of mosfet run audio amps and invertors. The main problem with them is they have very little protection if anything goes wrong. All the advertising saying they have short circuit or overload protection is rubbish. What they mean is they put fuses inside . Problem is the mosfets and power drivers blow much faster than the fuses do, so by the time the fuses go, all the damage is done. Looking at the heat sync condition I don't think it's the first time it's blown....and won't be the last.
The fuse is to protect the battery, not the inverter. My friend, the mosfet certainly burns out before the current is cut off from the circuit or the fuse is blown.
@@inventorkr1 Exactly my point.... All the damage is done before current is cut. So the device is not protected as advertised. No-one is doubting that you can fix them, but those sort of repairs should not need to be carried out if they weren't of such poor design. Quality and protection are definately being traded for price.
I agree with you, having worked in the military field, quality and reliability are primary, but unfortunately in the commercial world it is rather the sales volume that counts, so protection systems are minimal, or non-existent!👍👍
I don't think the design of this inverter can handle 6000W of 480A 12V rating. The real power it can deliver according to the size of cable, transformer, heatsink and MOSFTETS are at most 100A (1200W), and I am being generous here. I wouldn't use it above 600W (50A) for prolonged time. This calculation is based on comparison of real 1800W 12V inverter that I bought that is bigger heatsink and transformers, thicker wire & connection and more in number of MOSFETs than this one. The size of this 6000W inverter components in video similar with my another inverter 48V 2000W (40A), so I guess this inverter can handle up to 50A.
@@inventorkr1 You should know that the ratings put on these low cost inverters are lies. Not just a little bit false. Not just a little opimistic. Outrageously, completely different than the actual sustained power the unit can produce.
I agree. This inverter is at most 1200 watts or 1000 watts. Since the manufacturer is Chinese, they don't need a standard to write on it. I have a 3000 watt device. Its cables are 4 times longer than the cables of this device.
I don't test mosfets this way any longer because many will leak D-S at high(normal) voltages, even 'new' ones, so they must be tested at actual operating voltage which can be up to 350v.
He didn’t bother to insert the mosfet leads to the through holes? Though its ok but not a good practice esp if we are concern with the reliability of the repair..
is it justified to have 6000w inverter @12v? is it not too much for the battery to handle ? around 480 Amps power draw, what type of cable can handle that?
Solamente fué esos transistores?. 😮. Difícil cuando no es solamente eso. Cuando hay falla en la etapa ocsiladora o en regulación o en la etapa de protección
felicidades amigo por el video, tengo una pregunta, veras tengo un inversor comercial chino de 24v a 220v a 50hz que es de onda senoidal pura pero que dicha onda vista en un osciloscopio se aprecia un pequeño rizado en la onda tanto arriba de la onda como abajo de la onda y queria saber como se puede filtrar o corregir ese rizado de la onda ? y si puede ser peligroso para los aparatos que se conecten por tener dicho rizado ? gracias de antemano, un saludo
@@inventorkr1 are you 100% Sure. because even industrial transformers winding with robots never can be the same output.most inventers have series connection transformers that way you can manipulate output voltage.
what is the cross-sectional area of the flat part of the connector, 1x20mm=20 mm*2, and if the max current is 10A/mm*2, it follows that the max safe current is 200A x 12v= 2400W is the max power
Hello, nice video and effective routine, i have one question, is it ok to not insert the mosfets through holes of the PCB, just soldering on the surface ? thanks.
These pcb for power electronics are almost always only double sided, top and bottom copper layer (not multi-layer ones, like computer and other low power systems). Typically the bottom and top copper are connected through the holes of the pcb, which holes are metalized (top copper trace is connected to its bottom part thru the holes. Even if the solder did not fill up the hole, providing continuity, which is highly unlikely in this repair process, it's still 99.999%😎OK to solder the pins on the top layer only. Fully inserted pins provide mechanical strength, so theoretically these repaired transistors are more vulnerable to mechanical failure (vibrations etc.) as they are bolted to the chassis / enclosure /heatsink, while the pcb itself is not rigidly connected to that enclosure, hence it would have been better (at least theoretically or for long run failure free operation) the guy did insert fully the new transistors before soldering them.
Still, l given the number of transistors, x3=pins soldered, the pcb is virtually rigidly attached to the enclosure. However, there are other heavy components on that pcb, making it relatively heavy and a heavy hit or dropping the inverter on a hard floor might break the mechanically very weak solder joints of some of the transistors pins = failure!!! Of course, my analysis would apply for some professional repairs of very expensive/critical equipment (if it could be allowed to be repaired at all 🤔). But the best principles applied to any repair won't hurt 👍😎. Hope my answer helped.
Mình có bộ giống thế này nhưng chỉ mới kẹp vào binh chưa mở công tắc gì hết nhưng máy bị xịt khói, mặc dù đã kẹp đúng cọc. Anh có biết bị lỗi gì không.
A large percentage of the low end off brand inverter manufactures lie about their power capacity. I'd rather pay a little extra for a name brand with a good reputation, than take a chance on some unknown brand that claims to have a high power capacity.
Re-install a few old FETs because some rubbish China tester says they're OK? It doesn't test at the right voltage, and certainly not at high currents. Lucky that it doesn't break again as soon as you switch it on. Megafail!
@@vaclavkouba5295 Some of the worst soldering I have seen. If they put the MOSFETs in the PCB properly it would also help dissipate some heat - every little helps.
Voltage mode control topology. No cycle by cycle current limit so current overshoot during short circuit a certainty. Probably uses an ancient SG2525 controller. 30 year old technology.
Put it near a brandy sealed car battery for a week. This is a cheat. You can test it with phones first. Car batteries, heavy power banks are radioactive, the sensors upgrade the device. Affects phones, laptops, other electronic devices.
NO HABLA !!!😳... hay gente que le cuesta comunicar lo que piensa, entonces que lo escriba y otro lo léa o en su caso que ponga subtitulos...así nó sirve!! ...
what for, it will burn up again, those High Frequency inverters ALL burn up; the only solution is a Low frequency and a (very heavy, mine is 32Kg, 3500 watts) transformer; i repair them and builkd them too; with the EGS002 ONLY, NOTHING ELSE!!!! but the EGS002 MUST be modified or it will burn the inverter also; plenty in the net on that.(the 8 pin DIP IC must be removed, there are otrher ways)
12 Volt 6000 Watt = 500 A !!!! Mafatemiilpiacere! È peggio di un biglietto da 3 Euro! Per potenze del genere, optate per batterie a 48 Volt (minimo), e andate abbondanti con i cavi, che son 125 Amper. Cavi da 25 mmt e corti, per favore.
As a service engineer I have seen hundreds of mosfet run audio amps and invertors. The main problem with them is they have very little protection if anything goes wrong. All the advertising saying they have short circuit or overload protection is rubbish. What they mean is they put fuses inside . Problem is the mosfets and power drivers blow much faster than the fuses do, so by the time the fuses go, all the damage is done. Looking at the heat sync condition I don't think it's the first time it's blown....and won't be the last.
The fuse is to protect the battery, not the inverter. My friend, the mosfet certainly burns out before the current is cut off from the circuit or the fuse is blown.
@@inventorkr1 Exactly my point.... All the damage is done before current is cut. So the device is not protected as advertised. No-one is doubting that you can fix them, but those sort of repairs should not need to be carried out if they weren't of such poor design. Quality and protection are definately being traded for price.
I agree with you, having worked in the military field, quality and reliability are primary, but unfortunately in the commercial world it is rather the sales volume that counts, so protection systems are minimal, or non-existent!👍👍
I don't think the design of this inverter can handle 6000W of 480A 12V rating. The real power it can deliver according to the size of cable, transformer, heatsink and MOSFTETS are at most 100A (1200W), and I am being generous here. I wouldn't use it above 600W (50A) for prolonged time. This calculation is based on comparison of real 1800W 12V inverter that I bought that is bigger heatsink and transformers, thicker wire & connection and more in number of MOSFETs than this one. The size of this 6000W inverter components in video similar with my another inverter 48V 2000W (40A), so I guess this inverter can handle up to 50A.
It is written on the inverter according to the manufacturer
@@inventorkr1 You should know that the ratings put on these low cost inverters are lies. Not just a little bit false. Not just a little opimistic. Outrageously, completely different than the actual sustained power the unit can produce.
@@inventorkr1 what they write on the box is supposed to be peak value.. the permanent load is half that and I wouldn't believe that much either
@@jimmurphy5355like rechargeable 18650 batteries rated 9999mAh
You're correct! They write false ratings!
I am from Bangladesh you are very good engineer thanks
Ont voit que vous êtes bien équipé est que c'est vôtre travail bravo très bonne vidéo 👍
8:06 The lack of care in assembling with the dirty heatsink was hard on the eyes.
Amazing, but u could have clean the burnt marks off the heat sinks before replacing it.
Cool video tutorial - it's actually classical approach!
Thanks
Well done, my friend🥰🥰🤩🤗🤗
That's what good work is like 👏👏👏👏
What about cleaning the heatsink? And thermal paste or thermal pad? This way it will overheat again
I agree. This inverter is at most 1200 watts or 1000 watts. Since the manufacturer is Chinese, they don't need a standard to write on it. I have a 3000 watt device. Its cables are 4 times longer than the cables of this device.
Nice work bro, continue the good work❤❤
I don't test mosfets this way any longer because many will leak D-S at high(normal) voltages, even 'new' ones, so they must be tested at actual operating voltage which can be up to 350v.
He didn’t bother to insert the mosfet leads to the through holes? Though its ok but not a good practice esp if we are concern with the reliability of the repair..
Congratulations. I`m from Brasil - Parnamirim - Rio Grande do Norte
Set your oscilloscope input trigger level to 50% of the input channel you are using, that way the waveform can be steadily viewed.
Thank you from Africa
is it justified to have 6000w inverter @12v? is it not too much for the battery to handle ? around 480 Amps power draw, what type of cable can handle that?
Rough calculation 1metre cable length would need around 15mm diameter cable - not practical
Omg this is satisfying af!
No thermal paste ? Returning customer is a happy customer :)
From Bangladesh so so lovely work
Видео хорошее, познавательное
Bravo le travail est très bon
Solamente fué esos transistores?. 😮. Difícil cuando no es solamente eso. Cuando hay falla en la etapa ocsiladora o en regulación o en la etapa de protección
Good job ❤
😮🎉
Let me ask, does this circuit run on the H-bridge or half-bridge principle to boost 12v to 310v?
Why do inverters not like inductive loads and blow their output transistors?
Can output filtering be improved? Also - no clamps on output spikes!
Bạn có nhận sửa k? Mình có 1 con 24v hôm trước chạy quá tải giờ nó k lên nữa
felicidades amigo por el video, tengo una pregunta, veras tengo un inversor comercial chino de 24v a 220v a 50hz que es de onda senoidal pura pero que dicha onda vista en un osciloscopio se aprecia un pequeño rizado en la onda tanto arriba de la onda como abajo de la onda y queria saber como se puede filtrar o corregir ese rizado de la onda ? y si puede ser peligroso para los aparatos que se conecten por tener dicho rizado ? gracias de antemano, un saludo
I would say 2 to 2.5 kilowatts continuous yes but not 6kw No chance.
6000/12=500ah battery required
@@abymathewctr
500 Amps ....7 car batteryes
1000W max, if even that. Elementary, as Sherlock Holmes would say 😂
Great job 👍
are this ferrite transformers connected in parallel or series connection?
in parallel
@@inventorkr1 are you 100% Sure.
because even industrial transformers winding with robots never can be the same output.most inventers have series connection transformers that way you can manipulate output voltage.
It looks like it is not the first time those MOSFETS have been replaced !
you are beautiful engineer
What is the name of the device that you used to test the transistors
Ако мощността е истина това са 500 ампера
what is the cross-sectional area of the flat part of the connector, 1x20mm=20 mm*2, and if the max current is 10A/mm*2, it follows that the max safe current is 200A x 12v= 2400W is the max power
Hello, nice video and effective routine, i have one question, is it ok to not insert the mosfets through holes of the PCB, just soldering on the surface ? thanks.
If it doesn't make contact with all the pcb layers then it'll not work. So maybe his pcb made the contact
These pcb for power electronics are almost always only double sided, top and bottom copper layer (not multi-layer ones, like computer and other low power systems). Typically the bottom and top copper are connected through the holes of the pcb, which holes are metalized (top copper trace is connected to its bottom part thru the holes. Even if the solder did not fill up the hole, providing continuity, which is highly unlikely in this repair process, it's still 99.999%😎OK to solder the pins on the top layer only. Fully inserted pins provide mechanical strength, so theoretically these repaired transistors are more vulnerable to mechanical failure (vibrations etc.) as they are bolted to the chassis / enclosure /heatsink, while the pcb itself is not rigidly connected to that enclosure, hence it would have been better (at least theoretically or for long run failure free operation) the guy did insert fully the new transistors before soldering them.
Still, l given the number of transistors, x3=pins soldered, the pcb is virtually rigidly attached to the enclosure. However, there are other heavy components on that pcb, making it relatively heavy and a heavy hit or dropping the inverter on a hard floor might break the mechanically very weak solder joints of some of the transistors pins = failure!!! Of course, my analysis would apply for some professional repairs of very expensive/critical equipment (if it could be allowed to be repaired at all 🤔). But the best principles applied to any repair won't hurt 👍😎. Hope my answer helped.
Why did you not measure the output pulses after installing the input mosfet?
To make sure it works normally
nice job,good activity
Is par 2 AC 1.5 ton ki run kar sakte hai
Hola quiero aprender bien. Tengo muchos inversores de esos similar y no he conseguido repararlo. Ya revisé los MOSFET, conecto y no funciona.
اقولك ال 6000 w هذا او الي اكبر 7000 واط تشغل مكيف شباك طن ونص 18000 على السيارة
Mình có bộ giống thế này nhưng chỉ mới kẹp vào binh chưa mở công tắc gì hết nhưng máy bị xịt khói, mặc dù đã kẹp đúng cọc. Anh có biết bị lỗi gì không.
A large percentage of the low end off brand inverter manufactures lie about their power capacity. I'd rather pay a little extra for a name brand with a good reputation, than take a chance on some unknown brand that claims to have a high power capacity.
có sơ đồ mạch 24v lên 220v cho biến áp sắt mà không cân yêu cầu về sóng đầu ra không a
Sẽ sớm có video mới. Bạn có thể chế tạo biến tần tương tự theo cách đơn giản hơn và sẽ có sơ đồ mạch
Must be Chinese KW. To convert to US KW divide by 6.
Re-install a few old FETs because some rubbish China tester says they're OK? It doesn't test at the right voltage, and certainly not at high currents.
Lucky that it doesn't break again as soon as you switch it on. Megafail!
And the terrible soldering!!!
@@vaclavkouba5295 Some of the worst soldering I have seen. If they put the MOSFETs in the PCB properly it would also help dissipate some heat - every little helps.
Voltage mode control topology. No cycle by cycle current limit so current overshoot during short circuit a certainty. Probably uses an ancient SG2525 controller. 30 year old technology.
I am from pakistan i need it what is price are you send me this inverter or are you have any shop in pakistan
i know, Chinese cheap inverters are very easy to be broken :)
it's enough.
Soy de tengo un hinberso de 3000w se me olbido de sengancharlo de la corriente y ya uste sabe y puse la corriente 110v y no me funciona
ese provador de mosfets como lo consigo
Very nice
Awesome.
Here P=V*I therefore now I =95 Ampere V=11 Volt therefore it generates P=V*I , P=11*95 , therefore P=1045 watts
THANK YOU
why these invertor was broken?
Ok but can not see test meter for transistors left at 3 28, sorry.
Can you give clearer view of any tests on your meter, it would be better to see readings clearly, I have subscribed anyway.👍
Battery price please
Oh. Wouldn't it be nice if they were all that easy to fix.
Awesome
Itengo uno y lo puse y se meolvido y puse la corriete y no mefunciona
Put it near a brandy sealed car battery for a week. This is a cheat. You can test it with phones first. Car batteries, heavy power banks are radioactive, the sensors upgrade the device. Affects phones, laptops, other electronic devices.
Я не понимаю, зачем нужно было выпаивать все транзисторы? Тестером можно проверить и на плате!!
nice！！！！！
Nice
ขอบคุณมากครับ
Tienes buenos equipos para reparar y no sabes soldar 😅😅😅😅😅
Easy fix, because there so cheap made, that u find the fault in 5min.
Ảo quá ban ơi
😮😮😮😮
акум 500а 😮😮😮
Thanks
NO HABLA !!!😳... hay gente que le cuesta comunicar lo que piensa, entonces que lo escriba y otro lo léa o en su caso que ponga subtitulos...así nó sirve!!
...
like for all test matchin
First thing you should not make 6000w inverter from 12v
what a horrible way of soldering the transistors!
Yes
Little pressure can remove copper track lines.
Is it 6000w? I think 600w.😂
Tải được bao nhiêu ngày
what for, it will burn up again, those High Frequency inverters ALL burn up; the only solution is a Low frequency and a (very heavy, mine is 32Kg, 3500 watts) transformer; i repair them and builkd them too; with the EGS002 ONLY, NOTHING ELSE!!!! but the EGS002 MUST be modified or it will burn the inverter also; plenty in the net on that.(the 8 pin DIP IC must be removed, there are otrher ways)
Where can I find the modified circuit description?
If someone is making he is walking backwards of technology
👍
6кВт 12В ви про що? думайте головою, кількість транзисторів , струми, габарити і т.д.
PARTACTWO!
tôi muốn sửa thì làm sao
12 Volt 6000 Watt = 500 A !!!! Mafatemiilpiacere! È peggio di un biglietto da 3 Euro!
Per potenze del genere, optate per batterie a 48 Volt (minimo), e andate abbondanti con i cavi, che son 125 Amper. Cavi da 25 mmt e corti, per favore.
12v chỉ 1200w thôi
TH-cam alinaldo inversor
Dreh die Lüfter um damit sie rein blasen
Hahahahaha
Hate these crappy vids with no speech, all the multi-meter testing is completely pointless without explanation!
для чайника сойдет, для профи позор
Thank you