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UPS Safety and Costs
A couple of more suggestions, to help you spend your money wisely (and keep it).
1000 to 1200 Watts are required to provide adequate power for many desktop computers. To provide that power the 12 Volt batteries in many medium sized UPS units have at least a 100 AMP fuse! 12 Volts x 100 Amps = 1200 Watts. 100 Amps running through a wire or shorted circuit board can melt or catch fire to many fire "resistant" materials including the case plastics. After seeing two separate UPS units spontaneously combust due to their internal electronics or batteries shorting out. For fire safety reasons I now only use UPS units in metal cases. liebert makes nice dual conversion UPS units, In the short term they are some of the more expensive units, but they will make up for it in reduced battery costs and replacement hassles, because of their dual conversion design. They eliminate the cycling of Charging vs. ON Battery stress that many of the lower end UPS units have. Batteries in Liebert UPSs typically last about 5 to 7 Years. Batteries in simpler designed units typically last 2 to 2.5 years. At $75 to $100 bucks a battery change, recycling issues: battery = (LEAD + hydrocloric acid), hassle factor and not to mention the peace of mind. The few extra bucks up front is worth it. Also remember to test the batteries in your UPS at least yearly.
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