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What to expect with amperage draw?

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by SIERRADMAX, May 17, 2013.

  1. SIERRADMAX

    SIERRADMAX Feeling the Heat

    Joined:
    Jan 13, 2011
    Messages:
    284
    Loc:
    RI
    Sizing a UPS for back-up. What should my amperage draw be running my EBW-100 with control panel, fan & a single circulator?

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  2. BoilerMan

    BoilerMan Minister of Fire

    Joined:
    Apr 16, 2012
    Messages:
    1,517
    Loc:
    Northern Maine
    What model circulator? Usually 100W or less for a typical circulator, and figure another 100W for the boiler fan and control. This is just a rough guess so take with some salt. 300W max for the whole system I'd think.

    TS
  3. __dan

    __dan Burning Hunk

    Joined:
    Oct 5, 2011
    Messages:
    241
    The problem will be the batteries. Most computer UPS only provide enough battery for an orderly shutdown, 10 to 20 minutes with fresh batteries, which drops to zero as the batteries age beyond 3 to 5 years old.

    If you do it by the numbers with a true sinewave UPS and batteries for an extended runtime, the cost could get impractically large. I would not waste my money on the cheap APC units sold retail. You can get free ones all day long that need nothing but new batteries every 3 to 5 years.

    The money may be better spent on passive safety, overheat loops, and a small Yamaha or Honda inverter generator.

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