A SUN2000GTIL Inverter blew up AGAIN! This is unbelievable...
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- Опубліковано 8 січ 2024
- Hi, in this video, I want to show you the next patient on the operation table. A SUN2000GTIL inverter shorted again. Can there be a successful repair this time?
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That sucks, I hope you have better luck in the future
i think we'll soon see another deye and a very interesting paralleling video comming ;-)
so sorry that this one broke so soon
Unfortunately not. Three 1-phase make no sense, and one 3-phase is as well out of budget for the purpose it would have there. Rather I will now find out how to repair these inverters and open a repair business ;)
Roland, I presume replacing the original MOSFET rating with a higher rated MOSFET will only allow other components downstream to be damaged, whenever there is more Voltage spikes (Voltage Transients) beyond the original 500V rating.
I suspect the nearby coils on the mainboard being de-energeized having a collapsed magnetic field that causes a back EMF is the root cause of the MOSFET failure, of which the MOSFETs are not protected from reverse Voltage spikes (Voltage Transients).
I have read that inductive loads can damage MOSFETs, if there is no protection against reverse flow (i.e. Voltage Transients from Back EMF). Something to do with a nearby collapsing magnetic field. In the case of the inverter mainboard as shown in your video, I can see what looks like two coils near the two suspected failed MOSFETs. So, each time the coils are de-energerized, the collapsing magnetic field will induce a Voltage in the MOSFETs in reverse (Back EMF), which does prematurely damage MOSFETs if there is no protection component. Example protection components are Snubber (AKA Flyback) Diode, Varistor, or a Non-Polarized Capacitor (which will soak up the reverse voltage spike).
The optimal solution to slow down the collapsing magnetic field of the coils, which will reduce the reverse peak Voltage spike caused by Back EMF induced into the nearby MOSFETs. Apparently, this can be done with a "Snubber Diode" (AKA Flyback Diode) wired in parallel to the coils.
Quote (Snubber Diode AKA Flyback Diode solution to problematic Voltage Transients AKA Back EMF):
"place a diode in parallel to the relay coil, but make sure it is reverse biased. This means that the anode should be connected to the side of the relay that will connect to the negative voltage source and the cathode on the positive voltage source side. With normal operation of the circuit, the diode does not conduct when the relay is powered. When power is disconnected from the relay, instead of the relay generating a brief high voltage that will damage the driving circuit, the current through the coil that the coil tries to keep moving will follow the path through the diode and the voltage it induces will be limited to the forward voltage of the diode, about 0.7 volts. The maximum current the diode will need to conduct is the current the relay draws when powered, and the peak inverse voltage of the diode must be greater than the supply voltage for the relay."
circuits4tracks.daxack.ca/tips/SnubberDiodes.php
Hope this info helps you. It is above my pay grade.
What a nightmare it is for you, to be using unreliable Thai grid mains power.
You know far more than me about electrical engineering. I just did some quick reading on random web searches now for you. So, all credit goes to the internet users that posted info of which I just read and learned.
Matthew, sounds very plausible to me. This relatively cheap inverters unfortunately aren't designed to well. They work well in stable environments like stable grid, nice temperatures, etc. All what i can only dream of here. Haha.
@@RolandW_DIYEnergyandMore I made another edit to my above comment, about wiring Snubber Diodes (of which I also supplied a quote and a URL link to article). It seems the easiest quick solution to reduce problematic Voltage Transients are to wire in a Snubber Diode in parallel to the coils. I maybe saying it wrong, as I do not thoroughly understand this myself.
So, the key component options for a solution to minimize the negative impact of a collapsing magentic field that induces Voltage Transients in MOSFETs are: Snubber Diode (AKA Flyback Diode); Rectifier Diode; Varistor; Non-Polarized Capacitor.
Too bad I guess the surge protection is not sensitive enough to catch the AC spike. If mine go I will just redesign the system similar to your Deye inverter.
Suspect cause is due to collapsing magentic field that induces Voltage Transient within nearby MOSFETs. A dedicated external SPD (surge protection device) can not prevent Voltage Transients created by coils within the inverter mainboard itself. I just learned this myself. I am not an electical engineer, nor do I dare to even pretend.
Cool video, very informative. I also love to repair stuff instead of sending it back, but in this case I do not understand, why not sending it back if its two months old?
would have to send it to China. Cost for shipping would just be to much.
@@RolandW_DIYEnergyandMore It would probably never come back anyway
@@RolandW_DIYEnergyandMore ah yea, you're right.
Hi Roland, ich kenne Dein Problem auch. Vielleicht hilft Dir folgendes:
Ich habe auch die Situation der Wiedereinschaltspitzen durch das Versorgungsnetz.
Was bisher half ist der Einsatz von Timern in Kombination mit Schützen. So wird bei Wiederkehr der Spannung der erste Timer nach ca.5 min aktiv und gibt über das Schütz den 1. Inversor frei damit wird ein zweiter Timer aktiv und nach weiteren 4 oder 5 Minuten die nächsten Verbraucher zugeschalten. Usw.usw.....
Bleibt abzuwarten ob der Eingang des erten Timers die Spitzen verträgt. Bisher ja.
Das ist nur meine Überlegung dazu. Früher habe ich das über EIB in D für Grossmärkte installiert, resultierend aus der Energieabrechnung nach Lastspitzen.
Vieleicht hilft Dir das. Viel Glück bei der Reparatur des Inversor zum Trost...habe schon komplett verbrannte Mosfetbänke gesehen.😂
Hallo Frank, Deine Idee klingt wirklich gut. Ich denke auch, dass wenn man aus einer 1-2 sekündigen Unterbrechung, besser eine mehrere Minuten lange macht, das System einmal zur Ruhe kommt und dann wieder normal startet. Ich schau mich mal um ob ich was passendes finde. Danke, Grüsse nach Deutschland
Ich lebe in der Caribik, daher die gleichen Themen wie bei Dir😂
@@frankkaufmann9184 Ah. Sehr schön 😄
Hi Roland, same happened to me with a brand new one the first week and ordered a replacement board and only lasted 2 days. Now I have a pile of them waiting for repair. Two 2000 shorted in the AC side one 1000 on the DC and one 1000 with AC alarm on the display.
@@lauramarsotomayor3668 wow. My oldest SUN2000 is running since 3 years without any issue. All newer ones failed already and the newest even after a short time only. I think that the Chinese equipment is using crappy components these days. The 2 Mosfets which I have removed are from a no-name company. If this repair succeeds, then I will try to fix the other SUN1000 from before as well.
Roland, here is a explanation video about collapsing magnetic field from the coil inducing Back EMF, and why a Snubber (Flyback) Diode is used.
ua-cam.com/video/c6I7Ycbv8B8/v-deo.html
When there is no Snubber/Flyback Diode used, the Voltage Transient caused by the coil inducing Back EMF is magnitudes higher than normal directional input Voltage of Transistors and MOSFETs, which will result in failure.
So, I suspect your inverter mainboard does not have a Snubber/Flyback Diode (or similar such as a Rectifier Diode) wired in parallel to the coil where the induced Voltage can bypass the MOSFETs whenever there is a collapsed magnetic field. Each time there is a collapsed magnetic field the Transistor/MOSFET is damaged until ultimately it shorts. This apparently only needs to happen half a dozen times before shorting the MOSFET. Hence why bleeding out the Back EMF Voltage Transient from the coil and MOSFET circuit using a Snubber/Flyback Diode (Rectifier Diode) is highly recommended.
Roland, key words "Collector Emitter Breakdown". The MOSFETs are damaged due to "Collector Emitter Breakdown", as shown in the linked video above.