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BG394312137 I have been using this inverter for a while now and I only have two issues to report. First when using with a PC two monitors it works well. However there is a buzzing sound coming from the PC, which I suspect is the power supply. This also happened when using my electronic soldering iron. The soldering iron emitted a buzzing sound and did not heat up. When using an ordinary soldering iron, the buzzing was still there, but the iron worked well.Second, when I connected only my capsule coffee maker, the inverter went into overload and switched off.I think these issues may due to the fact that the inverter is not a pure sine wave, but I do not know for sure.It may be that the unit is faulty, or maybe this is a characteristic of this model.If anyone can enlighten me regarding these issues, please do