Perhaps when not receiving a true sine wave from the generator you
should reduce the load on the UPS to 50%
APC has the best answer for you on their web page...
73,
dave
wa3gin
Doug Rehman wrote:
>Thanks to all for the replies.
>
>I did leave out another link to TowerTalk: the generator powers the tower
>lights when the grid is down...
>
>To answer a few questions and make a few clarifications:
>
>The line conditioners are true line conditioners; They are APC model Line-R
>600. They do a great job during the occasional low voltage episode. About
>once a week or so, they'll kick in and raise a low line voltage from the
>grid.
>
>I don't have a problem with the UPS's during normal operation from the grid,
>only when off-grid and running on the back up generator.
>
>One of the units that died from cycling during this week's grid outage is a
>one week old APC 500 VA model, so I don't think the cycling is related to
>the battery condition- just the noise from the generator as compared to the
>grid.
>
>I do have a whole house surge protector installed. It doesn't seem to do
>anything for the generator's noise though.
>
>There were some suggestions about replacing the UPS batteries with larger
>ones (such as marine deep cycle). While it would greatly extend the runtime
>of the UPS's, I only need the UPS's to run for the 30 seconds it takes for
>the generator to come on line. The primary purpose for the generator is to
>power everything during prolonged outages such as the 5 day one during the
>2004 hurricane season. (I'm in Central Florida.)
>
>After thinking about it a bit, the UPS's that were not cycling were all
>lightly loaded. (The Belden on the phone system was one of the ones that
>didn't cycle- I doubt the phone system, an NEC DS1000, draws more than an
>amp or so. An APC 500 VA on the shack computer was another that didn't
>cycle- the computer was turned off.)
>
>Perhaps the solution lies in using over-sized UPS's?
>
>Tnx,
>Doug
>K4DDR
>
>
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