BEWARE!! – Cheap Chinese Modified Sine Wave Inverter 3000w (6000w peak) 12v-220v


Average 205v, supposed to be 220v 2.5mm Solid Core Copper Cable To Battery
Rated At 300 Amps, More Than Enough… 1800 watts only Hot Air Gun Switched On (half power) Switched To Full Power – 1800 watts It’s Getting Really Hot Now Inverter Cuts Out Nothing At All Now… Still Extremely Hot!!! Switch Off/On, Power Returns… But the same process repeats again throughout…

26 thoughts on “BEWARE!! – Cheap Chinese Modified Sine Wave Inverter 3000w (6000w peak) 12v-220v

  1. Thanks for the review, I was looking at the same product. However, note that cheap multi-meters don't necessarily measure RMS voltage (of modified sine waves) very well.
    I'd say that's probably why your multi-meter is reading low.

    If you can, look at the shape of the 'modified' sine-wave with an oscilloscope.
    There are some pretty ordinary 'modified' sine waves.
    It may be driving the internal overheating.

  2. It was overheating
    Do you think if had a way better fan or 2 or even 3 do you think itepild not shut off from overeating

  3. Also battery is only 10.3 volts . Low power shutdown is applied and that is normal. Even dropped to 10.1 volts. What do you expect to run with no power at all?

  4. I have just been researching inverters for a new van build, and came across this video.
    So i did a bit more research and found out that there are 2 types of inverter designs Low Frequency (LF) and High Frequency (HF).
    Cheap ones are normally High Frequency and use MOSFETs.
    This tend to overheat under load.
    Low Frequency inverters use large heavy toroidal transformers.
    However even for LF inverters they need to be sized correctly to cope with startup power of motors etc.
    So to cope with an 1800 Watt hot air gun, you will need an inverter that can cope with 10 x 1800W = 18000 Watts.
    So a 6000 Watt (normal) / 24000 Watt (Peak) LF Invertor, should be able to cope.
    If you do an ebay search for "inverter lf 6000 24000" then you should find them.
    However they are not cheap at around £350!
    There is a useful table in most of the adverts, that tells you the Inverter you need for each type of device.
    Please note that you will also need a 12Volt battery or batteries to cope with the load.
    So a 1000W device will need batteries that can deliver 250Amps, I think that you need to look at the CCA rating on battery. As this is the Cold Crank Amps, which is the maximum Amps a battery can deliver at 0 degrees for 30 seconds.
    Sorry that this is a bit techy, but it explains why this is happening.
    Hope that this advise is useful to someone!

  5. Good job you tripped the falt sensor vea power surge and it did want it's supposed to. the falt sensor acts as a house breaker to save the circuit and you have to shut the inverter off for at least 5 to 6 seconds to let the sensor rest

  6. There simply are no 3000W continuous inverters for £42. This is probably a 1000W inverter and for only £42 I don’t think is such a bad deal. The ‘only’ thing wrong with it is that it’s listed at 3000W.

    Your power cables are great! Although I would recommend to buy ‘normal’ multi core copper wire and property crimped connectors for convenience.

    Besides the inverter also your battery is not up for its 1800W load. Because of the voltage drop, the battery must pump even more current to the inverter and it won’t be able to keep that up for a long time. And the inverter has to work harder too! Even for a 1500W continuous load I think it would be wise to double your battery capacity. Both the batteries and the inverter will last longer.

    The best option would be a LiFePO4 battery. They are more expensive but have a lifespan of 2000 cycles in stead of 300 for lead acids. In the long run the cost less. The are more compact and are much lighter. Downside is that they can be discharged up to -20°C/4°F
    But can only be charged at above freezing temps. LiFePO4 are safe. No fire hazard like Li-Po’s and no Acid or explosive gasses.

  7. I am tempted to buy from China because have noticed big expensive brands get their products in China …They just rebrand. ..but I don't know how I can start. ..

  8. All the inverters are made in china or one of the other oryintal countrys the only ones built in us are government used and military cost to much for the public to by unless your rich

  9. I bought one exactly like that from ebay but it only works on a 24v battery bank configuration and not 12v. Why is that? The advertising said it works on both 12 and 24 volts.

  10. watch out!! modified sine wave inverters has no capability for handle induction loads!

  11. True sellers tells that normal load is 900w for this product, and not suitable for this heater nor coffee or inductions… Anyway for the price.. What did you expect…

  12. You are supplying 12v through a long run of cable. Input sags to 10.3 volts is not unexpected with a heavy load like this when battery or cable connectors have internal resistance. Not to stand up for this unknown product (the inverter could have poor internal input wiring as well). To be fair, use several batteries in parallel linkup with short, heavy cables, and make sure all connections are clean and tight. Use meter to track down the source of voltage drop. Cheers.

  13. Hey , Reena , you are already at the limit input voltage for 12v/220v inverter, you should have at least 11v to make a proper test!

  14. First off all – 2.5mm solid copper wires is the thickness of a 10 bits of your hair joined together. That's extremely thin cable, just enough to connect land line telephone – definitely not 12v battery.
    Second point is the size of your inverter. The bigger – the more powerful it is.
    3 Kw (3000 w) inverter must be at least a half meter (500mm) long, a quarter of meter (250mm) wide and 150mm height. Then you'll be able to run your air heater no probs. They are about £180 and up on eBay, but the do the job.

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