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On Thu, Apr 30, 2009 at 10:31 AM, maxim wexler <blissfix@×××××.com> wrote: |
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> |
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> |
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>> Unplug all your electronic devices and plug in a lamp with |
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>> a 100 Watt |
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>> incandescent light build. With the lamp on unplug the UPS |
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>> from the |
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>> wall and see what happens. If the battery is dead it won't |
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>> last all |
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>> that long. |
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> |
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> Gave ~5 mins. So I let it charge for 24 hrs now it gives me 36 mins. Which is wierd; what happened to all that charge? I haven't had to use it for 6-7 mons. Isn't the unit supposed to stay topped-up? |
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Well, assuming it was a 100 Watt incandescent that really draws 100 |
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Watts, then that's probably 1/2 to 1/3 the draw of a typical desktop |
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PC implying you would get 12-18 minutes before shutdown. (Really rough |
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ideas - just numbers, etc. Don't take it too seriously.) |
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These batteries have a limited lifetime and they need to be charged up |
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if they haven't been used in a while. |
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From the APC Forums an APC representative posted the following. Note #3: |
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[QUOTE] |
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Most APC batteries should last three to five years. Below are some |
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guidelines to ensure optimum life expectancy: |
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|
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***Some APC Back UPS models may have a shorter battery life |
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expectancy. Please reference the user's manual of your APC Back UPS to |
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determine the exact battery life expectancy. |
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1. Make sure that you keep your APC UPS in a cool, dry location with |
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plenty of ventilation. Ideally, the temperature where your UPS is kept |
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should not exceed 75° F (24° C). Also, for ventilation purposes, leave |
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roughly one to two inches on each side for proper airflow. |
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2. Only perform runtime calibrations on your UPS one or two times a |
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year, if necessary. Some of our customers want to check their systems |
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to verify that their runtime is sufficient. However, consistently |
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performing these calibrations can significantly decrease the life |
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expectancy of your APC battery. |
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3. Do not store APC batteries for extended periods of time. New |
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batteries can be stored for 6 to 12 months. After this period, the |
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battery should be used or it will lose a great deal of its charge. It |
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is not advisable to store batteries that have already been in use. |
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4. Do not exceed 80 percent of a UPS unit’s rated capacity due to the |
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reduction in run time. When you increase your load, your runtime |
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lessens. In the event of a power failure, a UPS loaded to full |
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capacity will drain and discharge it’s battery quickly and will lessen |
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the life expectancy. |
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[/QUOTE] |
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> |
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> Another thing: When I do the remove-the-usb-cable test I don't see the "communication lost" error in apcupsd.events until I switch the dial-up off and on quickly! |
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> |
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> In the conf file I have DEVICE: /dev/ttyS[0-3] because the default, /dev/ttyS0, locks out the modem. But why does the UPS need to know about serial ports? It connects by this funny RJ-45/USB cable. I wonder does the manufacturer assume the serial port won't be used? |
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Strange stuff but above my pay grade... |
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- Mark |
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