Overclock.net - An Overclocking Community - View Single Post - UPS online vs line-interactive : BATTERY LIFESPAN differences?

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post #4 of (permalink) Old 12-31-2018, 04:17 PM
AllenG
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Online UPS's do constant inversion, they bring in the AC, convert it to DC through the battery circuit, then dump back out to AC. Effectively the online ups batteries are in constant use at their topped off point. The line interactive clicks in just like an offline does but doesn't always switch to full battery, it does not do the AC-DC-AC conversion so it is not constantly using the batteries. The batteries are topped, and sit, with periodic cycling and re-topping. Batteries don't like to sit, ones that are constantly used but kept within their top 75% of charge will exhibit longer life cycles... why the online lasts longer. The real battery life in a full power out situation is about the same for all of them though. If you have a generator system that switches in and maybe cant quite keep the load voltage at 120, the online is also awesome as it will make up the difference down to ~70V, but not kill the UPS. Allowing you to keep more voltage sensitive equipment like servers online with barely or not enough power available. Most line interactive and offline at ~90V drops the ac line and switches to full battery.

As far as i'm concerned personally, the line-interactive systems don't exist. I'd go straight to Online if these were needs for my situation. Otherwise, the offline will do just fine and expect to replace the batteries. It's cheaper in the long run.

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