Computer battery backup

jim 249
jim 249 Posts: 347
edited November 2010 in DIY, Mods & Tweaks
Hi All; I need some advice on buying a battery backup that I could use on my modem in the event of a power failure. How big of a unit would I need to keep my modem going for a few hours to keep surfing the net or watching a football game? My laptop battery is good for 3 hours or so on a full charge. Thanks for any help!:biggrin:
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  • AudioGenics
    AudioGenics Posts: 2,567
    edited November 2010
    http://www.apc.com/products/category.cfm?id=13

    apc ups Uninterruptible Power Supply ( or similiar product )
    contact tech support for specific application and sizing.
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  • jinjuku
    jinjuku Posts: 1,523
    edited November 2010
    jim 249 wrote: »
    Hi All; I need some advice on buying a battery backup that I could use on my modem in the event of a power failure. How big of a unit would I need to keep my modem going for a few hours to keep surfing the net or watching a football game? My laptop battery is good for 3 hours or so on a full charge. Thanks for any help!:biggrin:

    What is the power supply rating for the modem (are we talking analog modem like dial up or cable/dsl modem?) in voltage and ampere?
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  • jim 249
    jim 249 Posts: 347
    edited November 2010
    What is the power supply rating for the modem (are we talking analog modem like dial up or cable/dsl modem?) in voltage and ampere?

    The modem is clearwire rated at 12 volts 1.5 amps and the router is 5 volts at 2 amps. No wattage is listed for either. Thanks
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  • jinjuku
    jinjuku Posts: 1,523
    edited November 2010
    jim 249 wrote: »
    The modem is clearwire rated at 12 volts 1.5 amps and the router is 5 volts at 2 amps. No wattage is listed for either. Thanks

    Voltage multiplied by amperage = wattage. So the modem is 18 watts and the router is 10 watts. So your total load is around 32-35 watts considering that transformers are not 100% efficient.

    According to the APC wattage calculator a 750va rated UPS will net you around 140 minutes and a 1500va rated unit would be double that.
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  • jim 249
    jim 249 Posts: 347
    edited November 2010
    Hi jinjuku; Thanks for the info!
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  • ysss
    ysss Posts: 213
    edited November 2010
    and... (to state the obvious)... you can also plug your notebook's adapter to the UPS, to prolong its runtime past the stated 3 hours...
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