Service was without hesitation, back, new ordered everything smoothly and quickly (credit and re-supply).
Since I have an automatic switch which switches back to mains voltage at leergelutschter battery, annoying the (s ..- loud) squeaking with dwindling power supply already powerful .... So lid off and disconnect. Uiui - the boards will see yet frighteningly out, partly with something like a salt coating it hanging there in some cases very crooked in it ... Let's see how long it goes well ...
Otherwise, it does at the moment for what it is. It provides 230V (one notices here and there but then that does not sinusoidal, but I knew before, and wanted to realize a 'cheap, small for emergency' device have) and not sucked excessively idle (unlike the clean sine 2000Watt floor).