![]() ![]() For example, if you look at this 1000VA CyberPower UPS. That could easily add 10% or more to the cost of the UPS. For my computer, two monitors, and all my network gear, I want the 1400VA, not two 700VA UPS.Īdding $20 to the cost of an UPS may very easily take that UPS out of the budget of many home and small office buyers. Your configuration is like having two 700VA UPS instead of one 1400VA UPS. In effect, you have a smaller capacity UPS that provides power longer. This means that UPS will NOT be able to support more demanding components. The other flaw in your logic is your configuration means 1/2 the power (current capability) is unavailable - until it kicks over to your second battery. It is two separate backup power supplies (even if in the same case), with one on-line and the other waiting in standby mode until needed. Your configuration is NOT two batteries wired in parallel. Nor, does it seem you have a complete grasp of the electronics theory with batteries here. Sorry, but you just don't understand the economics of marketing for home or small office (not "commercial") use. A bad battery's output voltage will immediately significantly. A good battery will maintain its rated output for several minutes before dropping. I have a giant 100W 10Ω ceramic resistor I put across the cell terminals when measuring with my meter. But as soon as you put a load on it, the voltage drops significantly. If you just put a multimeter on a 12V battery, it might easily show 12V. If your grid is unstable and the UPS kicks over to battery power frequently, the batteries will need to be replaced more often.Īlso, like all power sources (power supplies, engines, motors or batteries) they should be tested "under load". The wide range (2 - 5) is dependent on how the UPS is used. Note UPS batteries typically last 2 - 5 years and need to be replaced as part of "normal" maintenance. Unless the other "cells" are new, you should replace them all. The UPS will detect a problem with the battery and, to protect the UPS and the connected equipment, will shut down. When that happens, it essentially shorts out the entire battery. In your case, by your description, it sounds like one "cell" in the larger big UPS battery has developed an internal short. ![]() Use instructions from the Wiki page of Network UPS Tools.Click to expand.Sure! Note when two or more separate batteries are strapped together, they become "cells" forming one big battery. You should not use both as they might interfere with one another. Only one of these programs (PowerPanel or NUT) is required to monitor and shut the system down. If you do not wish to use PowerPanel, the Network UPS Tools (NUT) is an alternative. Now running on battery." -icon=battery-cautionīe sure to change your_username_here to your user name and your_userid_here to the numeric user ID of your user (use ls /run/user/ to list possibilities if you are not sure). ![]() # sudo -u your_username_here DISPLAY=:0 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/ your_userid_here/bus notify-send "Warning: Utility power has failed. For example, add the following line to either file: You can modify the pwrstatd-powerfail.sh and pwrstatd-lowbatt.sh scripts to send Desktop notifications when power fails or battery is low (respectively). See man pwrstat or the PDF user manual for more information on how to configure settings. For example, to configure the UPS not to shut down automatically when there is a power failure but battery power is still high: The pwrstat command also provides an interface for changing the settings. etc/powerpanel/pwrstatd-lowbatt.shĮnable shutdown system. etc/powerpanel/pwrstatd-powerfail.shĭuration of command running. To check the current settings, use pwrstat -config. Remaining runtime (estimated from current power draw) is less than a predetermined number of seconds (300 seconds-that is, 5 minutes-by default).Battery capacity is less than a predetermined percentage (35% by default), or.When battery power is low, as determined by either of two conditions:.When external power has failed for at least a certain amount of time (60 seconds by default).The service performs configurable actions in two different scenarios: (However, the command will not work unless the daemon is up and running.) ![]() You can check and change the current settings using the pwrstat command. # pwrstat -status The UPS information shows as following: It should be /etc/powerpanel/pwrstatd-email.sh Running Warning: Make sure the path to the email script at the bottom of these scripts is correct. ![]()
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