Jakob (Jack/Jackie) @jakob@mastodon.chaosfield.at

@Coffee the HP ProBook 445 comes with a ryzen 5600U with 15W TDP and I think you can TDP-Limit it in software to around 4W

@wolf480pl The one I have has a big transformer but it is only used for the Inverter for voltage step-up not for isolation, as isolation usually makes no sense for this usecase

@wolf480pl quoting an APC UPS manual: "If the UPS output must have a N-GND connection for zero volts while the UPS is "On Battery," an output isolation transformer must be attached to the UPS output so that a new N-GND connection can be made without creating a ground loop."

@wolf480pl ah yeah I forgot about mains powered ionization sensors...
I think you'll either have to do some rather janky UPS-patching or get a *big* UPS and even for those I don't know if they guarantee polarity :/

@wolf480pl yeah pure sine UPS exist. why do you need neutral hard-tied for the pump?

@wolf480pl https://community.se.com/t5/APC-UPS-Data-Center-Enterprise/Smart-UPS-1500-SMT1500RM2U-output-reverses-polarity-when-on/td-p/289470

apparently it's even an UL requirement of some sort to break the neutral connection when going into battery powered mode (at least for UPS which do not need to be hardwired but have a plug on the input)

@tofu ich bin mittlerweile ein recht großer fan von dem HP Elitebooks und ProBooks (zB Probook 445 g8 verteil ich grad in der arbeit und die sind echt solide, für das, dass man die ohne windows Lizenz für 600€ neu bekommt).
Und anders als die ganzen neuen X Serie Thinkpads haben die eine gut gebaute kühlung (und deutlich besseres Mikrofon aber das klang nicht so als wär das bei dir ein relevantes feature)

@wolf480pl usual "home* ups should have it floating as the ac plugs in many countries (europes "schuko" for example) are not polarized. It could be that they tie it to earth but I'd suspect them to be free floating