WHAT DOES UPSIDE DOWN MEAN?

SDsolarSDsolar one,68633 gold badges1919 silver badges3131 bronze badges one Ultimately I did chain an Opti 1500VA device for most stuff, which includes a little inkjet. When it provides up, then anything might be off (a single laptop will likely have a little bit extra time as a result of its very own interior UPS) such as the printer.The one plug