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Inverter 12V 220V modified power supply system

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#Roobert33 This inverter has been modified inside by inserting 12 Li-ion 3.7V batteries, to allow it to work even without external 12V voltage. Naturally, the inverter does not have enough power to function as well as in the original voltage. This experiment is just a curious and joking way of making a video, without any purpose of utility. The power supplied by the internal batteries lasts about 8 minutes with a resistive load of 40W - 4.5 minutes with 100W and 2 minutes with 200W. INVERTER: