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charge controller

Discussion in 'Electronic Design' started by skcscuba, Aug 15, 2006.

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  1. skcscuba

    skcscuba Guest

    I live off the grid in Puerto Rico and have 1600 Watts of solar cells
    charging a 24 V battery
    bank. Unfortunately we don't have quite enough power (I need my
    computer and 200 Watt tv, and wife
    needs her dishwasher and washer and dryer). I purchased a 1.5 kW boost
    buck transformer that I have
    wired for 240V in and 32V out (50 V open circuit)that I send into a
    full bridge rectifier array.
    The literature for my M60 outback charge controller seemed to indicate
    that they could accept this
    current source (from my generator when I want to top off the
    batteries), but to make a long story
    short, it won't work and I checked with several of the other solar
    controller manufacturers and
    they won't guarentee that their units will work either. I need the
    other half of a battery charger.
    How about an ultra simple charge controller using power fets (I have 4
    nice ifrp460 on a heat sink) to give me 27.2 float charge voltage
    limited to 40 amps. I would be happy to pay someone to design this and
    even happier to pay to have one built.
  2. Luhan

    Luhan Guest

    Computer - use a laptop.

    TV - get one that runs on 12/24 volts.

    Dishwasher (see Wife)

    Dryer (electric???) - try a clothsline.

    (Former RV dweller)
  3. Jon Elson

    Jon Elson Guest

    Why doesn't it work? Is it because it is a pulsating DC supply? Then,
    hook a
    (large) capacitor across the bridge rectifier output. Something like
    10,000 uF
    aluminum electrolytic should do the trick.

  4. Joerg

    Joerg Guest

    That would mean a huge dissipation. Assuming you'd get an average DC of
    40V or so at the bridge rectifier under 40A load that means about 13V
    need to be dropped. This translates into more than 500W of continuous
    dissipation. I've been in Puerto Rico and with the hot climate you guys
    have that may not be a good idea.

    I don't know your setup but something to consider might be a good
    quality battery charger for 24V truck batteries. Another alternative
    might be a big 28V switch mode supply from old mainframe computers, plus
    a monstrous diode. They used to be available at scrap dealers cheaply
    because nobody wanted them. Some of the 24V versions could be adjusted
    up a few volts.

    Dryer: You can convert many of those to propane.

    Dishwasher: Consider a few loops of 5/8" drip system tube on the roof to
    pre-heat the water. Think about skipping the dry cycle and propping the
    door instead.

    Heaters are typically the main power hogs in both units, at least in ours.
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