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Battery enclosure

Discussion in 'Photovoltaics' started by Michael Barlow, Sep 16, 2004.

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  1. I've been reading the News Group for a month or two getting bits and
    pieces of information in hopes that by this time next year I'll be ready for
    the purchase and configuration of a Solar charging system.

    I'm an Astronomer in Upstate NY with a small back yard observatory. At
    the moment I have a 12 gauge extension cord running from my garage to the
    Observatory (120 feet) running only a few small appliances. I'll have to do
    the math again to figure out exactly what power needs I have but more or
    less the maximum number of batteries I'll need will only be one 12v battery
    with a second as a possible backup. This would be used for up to a maximum
    of 12 hours at night, charge during the day, and then another night time
    maximum 12 hours with the maximum of four nights in a row - and a maximum of
    two strait months of non use.

    My question is on Temperature. I'll have to store the battery(s) out
    side the observatory in their own enclosure. With the temperatures
    stretching from 100F (maximum summer) down to -10F (maximum winter). What
    would be considered a good enclosure for them? I'm thinking of a vented
    wooden box with fiberglass insulation and no heating element. Would I be
    right with that idea or is there a better suggestion?
  2. Ecnerwal

    Ecnerwal Guest

    Unless you have bedrock at the surface or a very high water table, the
    best solution is to dig a hole. Line with a foundation, well tile,
    upended culvert section, etc. Keeps the temperature much more stable...
  3. john

    john Guest

    skip the insulation and you will be good to go. however increase the
    number of batteries to 4.
  4. philo

    philo Guest

    at -10F the battery will only have about 35% capacity...and putting
    insulation around it is not likely to do anything.
    unless you come up with a way to keep the battery in a warmer
    environment...i'd say you should use two 12v batteries in parallel.

    btw: if you have not yet purchased the batteries yet... you could get two,
    6 volt "golf-cart" type batteries and use them in series. you may find
    that you'll get more ampere-hours per dollar than using 2 "standard" 12v
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