John R Pierce wrote: > On 9/30/2014 11:22 AM, m.roth at 5-cent.us wrote: >> The SmartUPS are... but then, overwhelmingly, mine are rackmount. I have >> mentioned here, before, though, that at least with the SmartUPS, you can >> easily, and far less expensively, buy replacement batteries, but they >> *MUST* be HR (high rate) batteries; anything else, and the SmartUPS >> don't believe they've been replaced correctly. > > quality VRLA (SLA, AGM) batteries are capable of delivering massive > current loads, I've not had any problems using these on good UPSs. At > home, i've got an /ancient/ SmartUPS2000 (2KVA) tower unit that I > repopulated with Panasonic 12V 20AH 'motorcycle' batteries. its been > running great now for nearly 10 years, and STILL can keep my entire home > computer load going for 4+ hours in a failure. These batteries are > WAY past the 'normal' end of life, but are still doing very strong. I > even put a safety light on them, a floor lamp with a 7W LED bulb bounced > off the ceiling, thats left always-on, as this room is quite dark. Right... at home. I'm running mostly SmartUPS 3000s, rack mount, that take eight batteries (which I can buy for about $100), or I could buy a new set, with sled, for way over $300.... The HRs should work in anything... but I've got some of the 3000's that peak at over 90% usage (say, 3 64-core servers running flat out with a load over 70), and these batteries allege, at that kind of load, < 15 min, maybe < 7. With the daily (or twice daily - wonderful line we have here at a huge, major US gov't agency in the DC 'burbs), it's fine, and they don't notice the second or two blips. mark