Ask our Experts
Didn't find what you are looking for? Ask our experts!
Dear Community Members, We are currently experiencing a technical issue that is affecting the ability to create new posts. Our team is actively investigating the root cause and working to resolve it as quickly as possible. We apologize for the inconvenience and appreciate your patience. SE Community Team!
Support forum to share knowledge about installation and configuration of APC offers including Home Office UPS, Surge Protectors, UTS, software and services.
Search in
Link copied. Please paste this link to share this article on your social media post.
Posted: 2025-09-30 08:19 AM
I've had a Back-UPS NS 1080 for several years, but I don't think it ever switched to battery any time I've lost power. Any time there's been a sudden cut in power briefly my computer and monitor lose power instead of staying on. They are definitely plugged into the batter back up sockets and the display shows the battery fully charged but it seems to do nothing when there's a power loss.
Link copied. Please paste this link to share this article on your social media post.
Link copied. Please paste this link to share this article on your social media post.
Posted: 2025-10-01 05:09 AM . Last Modified: 2025-10-01 05:10 AM
Based only on the information provided here it would appear the RBC is EOL and needs to be replaced.
If you conduct a manual lights out / grid down test by removing AC power the system should continue to run for a period of time.
If not, than it’s highly likely the RBC needs replacement. The RBC is rated to provide 2-5 years of service life based on usage, temperature, and environmental conditions.
Its designed to sustain 260 full depletion cycles baring the above caveat’s. Your options are to replace the RBC with APC branded / third party or rebuild the pack using HR cells.
Its more economical to simply purchase quality cells like the original CSB branded and rebuild the pack.
Your system came with two 12 VDC 7.5 AH cells tide in series to produce 24 VDC. Please consider buying 9 / 10 AH cells to obtain longer operational runtime.
NOTE: Do not count on the Self Test to determine the RBC state of health. By the time this circuit actually detects a failed RBC it’s literally EOL! ☝️
Questions Ask . . . 👍
Link copied. Please paste this link to share this article on your social media post.
You’ve reached the end of your document
Create your free account or log in to subscribe to the board - and gain access to more than 10,000+ support articles along with insights from experts and peers.