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You might know more than me Jerry, but I was under the impression that the APC UPS's didn't work the way you have just described. If they do then there is an awful lot of electronics in there that doesn't do anything. Again I do suppose it would vary from manufacturer?to manufacturer but I have a little faith in APC! You can also program the UPS to behave differently under different conditions, for instance to wait 5 minutes before coming off battery power.
Again I am only reccommending the use of a UPS from my own personal experience, If you have already invested the money in a high quality generator the issue becomes redundant.
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John Kiely (IRL)
From: Jerry Durand <jdurand@...>
To: 7x12minilathe@... Sent: Tuesday, November 6, 2012 11:19 PM Subject: Re: [7x12minilathe] Re: Thinking of you. On 11/6/2012 2:17 PM, John Kiely wrote:
Actually, most UPS units do ZERO to clean up the power (but you can buy some with filtering options).? All the standard ones are is an inverter, battery, and relay.? On out-of-spec power they simply disconnect from the AC mains and connect you to the inverter and you're now running on battery. If you have a lot of power variations, you'll quickly wear out a UPS. Also, a generator seeing the load disappear when the UPS disconnects will cause it to throttle back.? Then when the UPS tries to switch back, the sudden load will make the generator slow down, often tripping the UPS again.? I've seen where the generator winds up ramping up and down constantly as the UPS keeps trying to reconnect...until the battery goes dead.? Larger generators will have less trouble. If you're really concerned about power, you need something like one of these http://www.tsipower.com/ NOT cheap but they work by monitoring the AC Mains cycle by cycle and applying instant adjustments as needed.? These are really popular in places around the world that have much worse power than we normally see here.? I evaluated these for a customer but even with my wholesale discount he choked on the cost (he needed fairly big ones). An intermediate is a Voltage Stabilizer such as the "APC-LE1200-Automatic-Voltage-Regulator". I recently installed several of these for a client, they were $40 each with free shipping from Amazon.com.? These devices correct for high/low voltage in steps and also have some filtering on the AC power.? You'll find these on TV sets and sound systems all over the place. -- Jerry Durand, Durand Interstellar, Inc. tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
