(30-07-2015, 08:16 PM)Ziricom Wrote:No shit? that's good that they finally figured that part out..(30-07-2015, 08:12 PM)daviddds Wrote: APC consumer grade is junk, anything over 30 minutes and the mosfets burn out, and i doubt the batteries will last over a year or two because they don't cycle them and AGM/SLA batteries need to be cycled or left at a float voltage, they love to keep them at a cycle charge voltage and boil off all the electrolyte.
on the other hand, a pure sinewave inverter + external batteries and a transfer switch, costs a bit more but is much more reliable and the transfer time is 6ms or something when the inverter has a grid sync/lock, the lights don't even flicker... i use an inverter that runs on 40-60vdc, can use battery cables about 1/3rd the size of a 12v inverter. youd be surprised what you can find in used industrial/telco stuff that's perfectly fine and hardly been used if at all..
Well that is interesting. My UPS Cycles itself to battery 4 times a day for 9 minute intervals.
@ the cable going out when the power goes out, you'd think nearly all isp's are using power supplies with battery backups like this alpha one:
http://i.imgur.com/zM56pvp.jpg
http://i.imgur.com/skTdQCy.png
they're probably just too lazy to setup the SNMP monitoring and receive fault messages, change the batteries out when they go bad. hub sites usually use an onan/generac generator + batteries and have their own onsite propane to last for a few days and the Alpha boxes accept a generator input for long duration outages, they just have to be refueled every 6-12 hours..
too bad most isp's are making customers replace the batteries on even leased modems, baffles my mind how they get away with that.
and if you're lucky and your cable company offers business transit over their fiber ring, sorta like comcast is doing with the dpon stuff, service isnt even effected by nodes going down. that being said, I do miss my DSL, days without power and it was still functioning.