re uninterruptible power supply i m no expert at ups s but you said something that made it sound like you didn t realize something on a typical ups well on ours anyway there is no switchover from ac to dc all the protected equipment is always running from the batteries via an inverter with the usual condition of also having them on charge if the power fails big deal the computers never see it until the batteries start to droop but there s something like car sized batteries in that cabinet so it takes a while if you were gonna run the guts on straight dc instead of an inverter why not do it all the time then there d be no switchover to screw things up and no having to sense the failure fast just keep the dc on charge when the power is on and it ll be there in zero time when you need it just some ideas can t guarantee what ll work or not but hope at least some of this helped
