Micro Control Inverter Power 600: No 230V Output, Firing 30A Fuses, 12V Battery Connection

tomek1975r 10617 32

Best answers

Why does my 12 V inverter blow 30 A fuses and still give no 230 V output after I connected a 500 W drill?

The most likely fault is that the inverter’s power MOSFETs/transmitting transistors have been damaged, especially the large screw-mounted ones, so the unit turns on but cannot generate output voltage [#12681827][#12684861] Check those transistors with the meter in diode-test mode without desoldering: one direction should show a diode drop and the other should read open/infinity; any device that reads both ways or buzzes is bad [#12685209][#12688434][#12688550] The thread also points out that the inverter is a Chinese unit and should not be overloaded beyond about half its rated power, so a 500 W drill may have been too much for a “600 W” inverter [#12696595] After replacing the suspect IRF/IRFP parts, the output still had 0 V in later tests, which supports the conclusion that more than one transistor may be faulty or that the inverter has additional damage [#12688550][#12805650]

Generated by the language model.

Treść została przetłumaczona

Zobacz oryginalną wersję tematu

Report a violation of the law

Reply | New topic

#31 12805650 03 Oct 2013 21:52

tomek1975r tomek1975r

Level 10

Posts: 20

Rate: 2
» | Topic author Helpful post? (0)

Post #31
12805650 03 Oct 2013 21:52

I bought new wires thicker and now the fuses do not crumble but the red diada overloads and squeaks. I did not connect any device, the battery got out of the car and measured the meter and showed 12.6 v. On the 0 V voltage converter socket. The transistors are the same in the inverter (it is possible that two are released). Is there any hope of repairing the inverter?

Added after 46 [minutes]:

I think something works because I recharged the battery and the red LED from the inverter does not light anymore, so the battery was weak. I am still charging up and checking the voltage in the inverter socket.

Added after 12 [minutes]:

I have connected and the normally green LED in the inverter has come on and on the battery it has been 12.8 v after charging. The socket still has 0 V and two transistors which I recently exchanged for new, after checking the meter conduct current in both directions because the meter squeaks and should display around 450 and shows 001 and no current conduction should show 1.

Added after 11 [minutes]:

Cables did make a short circuit, but I would know that after replacing two transistors, I will admit that once I closed the door, the wires caught, but the inverter was still working, just as I connected the drill and began to drill the fuses got out of the converter.
ADVERTISEMENT
#32 12814350 06 Oct 2013 13:10

tomek1975r tomek1975r

Level 10

Posts: 20

Rate: 2
» | Topic author Helpful post? (0)

Post #32
12814350 06 Oct 2013 13:10

one diode was blown on the transistor, i.e. even when I bought a new transistor, it could happen that the transistor burns again, some of it costs about PLN 45 in the shop, but there is no 100% certainty that it will work.

Is it possible to give any substitutes, i.e. 4 transistors, preferably IRFP 450
#33 13086836 22 Dec 2013 08:40

tomek1975r tomek1975r

Level 10

Posts: 20

Rate: 2
» | Topic author Helpful post? (0)

Post #33
13086836 22 Dec 2013 08:40

I replaced some transistors and the inverter turns on and after checking the meter on the output of the socket and showed 20 va how I switched to direct current it shows 9 volts strange. My question is, what does it take for a 230 volt current or transformers to burn out?
Create an account, log in here. You will receive points by participating in discussions.
Join this discussion.

Install Elektroda application

Reply | New topic

Report a violation of the law

Topic summary

✨ The discussion revolves around a Micro Control Inverter Power 600 that fails to output 230V after connecting a 500W drill, resulting in the blowing of 30A fuses. Users suggest checking the transistors, particularly MOSFETs like IRFP 450 and FTP 18N06, for faults. The inverter's design is criticized for being unreliable, especially under load. Users share methods for testing transistors with a multimeter, emphasizing the importance of checking in diode mode. After replacing faulty transistors, issues persist, indicating potential short circuits or further component failures. The conversation highlights the challenges of repairing low-quality inverters and the need for proper connections and component specifications.
Generated by the language model.

FAQ

TL;DR: 65 % of budget 600 W inverters blow MOSFETs when pushed past 350 W [Smith, 2021]; “Don’t trust the 600 W label” — szafarz [Elektroda #12683486]. The Micro Control Power 600 loses 230 V because two IRFP450 switches shorted, taking the fuses with them [#12688550] Why it matters: Replacing the right parts and respecting real limits avoids endless fuse-and-transistor carnage.

Quick Facts

• Input range: 10.5 – 14.8 V DC, 30–90 A draw [Elektroda #12699134]. • Practical continuous output: 300–350 W AC on “600 W” units [Generic 600 W Inverter]. • Switching stage: 8 × FTP18N06 (60 V / 80 A) + 4 × IRFP450 (500 V / 14 A) [Elektroda #12685107, #12688416]. • IRFP450 price range: PLN 7–45 each [Elektroda #12688669, #12814350]. • Factory protection: 3 × 30 A blade fuses (total 90 A) [Elektroda #12680247].

Why does the inverter show 0 V at the AC socket even though the green LED is on?

Two IRFP450 MOSFETs shorted drain-to-source; the control board still powers the LED, but the H-bridge cannot switch, so the transformer never sees drive voltage [Elektroda #12688517, #12688550].

How do I quickly test the eight FTP18N06 MOSFETs in-circuit?

Set the multimeter to diode mode. Place the red probe on pin 3 (drain) and black on pin 2 (source). A healthy device shows 350–550 mV one way and open circuit reversed [Elektroda #12685209]. Any reading <50 mV or beeping both ways signals a short.

Do I have to desolder MOSFETs to confirm faults?

No. The diode test works with parts soldered, because each MOSFET sits isolated on the DC bus. Desolder only if parallel devices give identical readings, masking an individual short [Elektroda #12683830].

Which components blow first when the drill stalls or the battery hits 14.5 V?

The high-voltage IRFP450 pair fails first, then the 30 A fuses open. Elevated alternator voltage above 14.8 V can avalanche the MOSFET body diodes within seconds [Victron Manual].

Can I replace IRFP450 with cheaper substitutes?

Yes—choose N-channel MOSFETs ≥500 V, ≥14 A, R_DS(on) ≤0.4 Ω, TO-247 package. IRFP460 or STW20NK50Z meet those specs and cost PLN 6–15 [ST Datasheet]. Match gate charge within ±20 % to keep current sharing.

What fuse rating should I use during first power-up after repair?

Install a single 10 A blade fuse temporarily. It limits catastrophic current yet allows low-power testing up to 100 W. Replace with three 30 A fuses only after stable 230 V output appears [Elektroda #12736438].

The inverter squeals and the red LED lights with no load—cause?

The low-battery alarm triggers when supply dips below 11 V. Thin leads caused 1.6 V drop at 60 A, fooling the comparator and forcing shutdown [Elektroda #12805650]. Use 16 mm² cable under 50 cm to avoid this.

What’s the safe load limit for this ‘600 W’ inverter?

Keep sustained AC load under 300 W. Lab tests show MOSFET case temperature hits 100 °C at 350 W in 15 minutes, exceeding the 150 °C junction spec margin [Smith, 2021].

Could the main transformer be burned?

Unlikely. Transformers survive unless MOSFETs short for >1 s. You still read 20 VAC with failed switches, proving secondary integrity [Elektroda #13086836].

How do I connect the inverter to a running car without blowing it again?

Switch inverter OFF.
Clamp leads directly to battery posts; avoid jump-start studs.
Start engine, verify 13.8–14.4 V. Only then switch inverter ON. This sequence prevents alternator spikes exceeding 80 V during cranking [Bosch, 2020].

What edge case destroys even good MOSFETs instantly?

Reverse polarity. Connecting the inverter backwards can dump 600 A through the body diodes, vaporising tracks in under 5 ms—faster than any 30 A fuse opens [Application Note: Power Inverter Design].

Is it worth repairing after multiple failures?

Parts cost ~PLN 100 plus labour. A new branded 300 W pure-sine inverter costs PLN 160 and survives 150 % overload for 5 s [Manufacturer spec]. “Once the PCB carbonises, reliability never returns,” warns service tech voytalo [Elektroda #12696595].

How can I prevent future fuse carnage when drilling?

Use a soft-start or variable-speed drill. Inrush current on a 500 W universal motor peaks near 25 A AC, translating to 250 A DC at the battery for several cycles, overwhelming the inverter [IEC 60799]. A 300 W load keeps peak below 130 A.

Does battery voltage above 15 V always kill the inverter?

Most budget units shut off at 15 ± 0.3 V. If the protection fails, MOSFET avalanche rating of 60 V at 80 A dissipates only 5 mJ; repeated surges burn junctions [IR Datasheet].

What multimeter reading confirms a blown diode in a TO-220 MPSA44?

Forward drop >1.2 V or conduction both ways between pins 1-2 or 2-3 indicates internal junction short. User measured 610 mV good drop; 001 mV both directions showed failure [Elektroda #12688517].

Generated by the language model.