On Fri, Mar 3, 2023 at 7:54 AM Roger Heflin <rogerheflin@xxxxxxxxx> wrote: >[...] > > If you read about normal UPSes they are not normally designed to run > 100% duty cycle (ie on battery for days, or fixing up a low voltage > for days). So if you run yours at say 40% load it will probably > survive under the higher duty cycle, but if you run it close to 100% > load and it gets into cleaning up low voltages the UPS electronics may > not survive long (ie if fixing the voltages for hours/days). > > So if they end up running in that state for long periods of time > (either because of adding bigger batteries--my UPS came with 12AH > batterys but now has external 35AH ones) and/or extended low voltages > various components may burn out. > > There is also a setting on at least some UPSes that you can change so > that it does not regulate the lower voltages (wider acceptable voltage > range) and accepts those voltages as ok. I have done that with both of > my UPSes because the default setting prevents the UPSes from charging > when on a small generator, and would if the voltages was low but still > good enough cause the UPS to keep fixing the slightly low voltages and > possibly burn out. I don't think the part about a generator is a good idea. Generators are usually wildly out of spec for Total Harmonic Distortion (THD). A generator under load can easily reach 15% to 20% THD. Meanwhile, electronics usually expect 3% THD or less. So you want the signal conditioned, and not passing directly through to the electronics. Jeff _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
