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Topic:
What do you put on your wattboxes?
This thread has 30 replies. Displaying posts 31 through 31.
Post 31 made on Wednesday November 22, 2017 at 14:53
buzz
Super Member
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May 2003
4,366
On November 21, 2017 at 21:01, mrtristan said...
Doesn't it sort of defeat the purpose of having a UPS if you are going to schedule a reboot on a device somewhat randomly? Do the majority of UPS units actually stabilize voltage in a way that prevents peaks and dips away from the ideal voltage or are they merely providing power when power goes out? I'm not sure if sub $500 UPS is actually stabilizing voltage. Tell me if I'm wrong. I can see the usefulness from an IT standpoint in that it can prevent the loss of data. If we are periodically rebooting a router in a commercial setting, is someone making sure that it is not happening, say, when a network device is performing an auto update?

Some UPS's provide voltage stabilization over a range of input voltages, others simply switch on the inverter. There are (more expensive) "online" units were the inverter is always running and the power line is used only to keep the battery charged. These units can offer the best load isolation from power line transients and interruptions. The "offline" units connect the load directly to the power line, possibly providing some surge protection and voltage boost or cut (always check the details about this before specking a unit). When there is a power outage or voltage out of spec condition, the offline inverter starts up and the load is switched from power line to inverter. The switch over is usually within a few milliseconds, but really sensitive load devices might balk about this brief outage.

"Sine wave" UPS is the best bet because the cheaper units offer a very raw waveform that will upset some switching power supplies.

I don't always spec a UPS and my level of surge suppression varies by location. There is a "lightning alley" nearby and I always protect to the max here. Other areas are very stable and I use minimal protection. If there are voltage fluctuations, I like to use something in this series of Tripplite when I don't need a UPS. These are particularly useful if there is a lot of RF on the power line. I've been using one of these at home since about 2000. These units will very easily support an office laser printer, while a UPS for this size load might be too expensive. I recently stuck one of these in a house where I can see very visible fluctuations in the lights several times an hour. One point to consider for these units is that the voltage adjustments are done with relays that one can hear. These are not the best units to use in a bedroom or quiet theater.

I have my computer on a UPS. This was wonderful the other day because there was a pair of brief (a second or two) outages that would have otherwise trashed my open work. The router is not included on the UPS and I had to wait for it to reboot.

If there is a standby generator on the premises, you don't need a beefy battery in the UPS.
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