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doubtful article?

Discussion in 'Home Power and Microgeneration' started by Robert Morein, Jul 25, 2004.

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  1. Yes, this has just given me an idea to follow up the above:
    If possible, keep the Deep-cycle Batteries seperated from the
    Load with current limiting and use the cheapo Automotive Battery
    in between (connected in parrallel) for the peaks of high current
    drain as a Buffer.
    Unfortunately with this new configuration you would not be able to
    take advantage of as much current for as much time when using
    the Deep-cycles directly but they would at least be protected.
    Maybe make it into a manually switched in mode as required?

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  2. Can't be right, though he could think he's seeing this effect if his
    charger isn't doing the right thing.

    I'm especially concerned by "leave the auto battery in parallel all
    the time, for surge loads" with no thought to what deep cycles will do
    to the auto battery.

    One thing he did get right:

    This is an empirical article based on 10 years of cruising experience,
    with no technical verification.
     
  3. Vaughn

    Vaughn Guest

    Take it from somebody who ruined way too many batteries before he finally
    figured it out...

    It is far more likely that this guy has just never had a really good
    charger. If you have a charger that charges to too high a voltage, you are
    certainly better off to isolate the battery bank and charge it manually
    occasionally; which is exactly what he is doing.

    Vaughn
     
  4. Well, my good Trace inverter/charger was hooked up to four Trojans for a year
    in a warm shed, and I was disappointed in the battery life. Part of it was
    undoubtedly the excess heat, but I've found that constant charging a small
    battery bank with little load didn't work out very well for me. The Trace got
    moved to my van, where the charger portion is _really_ oversized for the single
    marine trolling battery that it now lives with. I charge less frequently and
    am getting better battery life.

    Charger amperage does need to fit the size of the battery bank, and I'm more
    inclined to think the boat owner was simply overcharging rather than creating
    any "memory" effect on a small portion of the plate. Then again, I'm only
    speaking from my experience and what I've read.
     
  5. chuck h

    chuck h Guest

    Perhaps the application being different from your's (an assumption) is why
    the observation "runs counter to anything I've read elsewhere". The author
    of the article is addressing a very specific group of alternative power
    users ... people who live on cruising boats.

    Chuckh
     
  6. Bob Adkins

    Bob Adkins Guest

    If he hadn't intentionally deep cycled his batteries during his 10 years of
    experience, he would swear by not deep cycling. He probably lucked out that
    he didn't lose more batteries from deep cycling.

    Bob
     
  7. daestrom

    daestrom Guest

    Follow manufacturer's direction. Use the type of battery best suited for
    the service it will supply.

    In last paragraph, the statement about "...is of the maintenance free type,"
    doesn't line-up with "deep-cycle" service. Maintenance free are calcium
    grid batteries meant for long periods of standby service (i.e. not
    deep-cycle).

    Then the statement, "If they are the lead-acid type..." Well, DUH! isn't
    that what we're talking about, just different types of lead-acid batteries?
    Or is he thinking that 'maintenance free batteries' aren't lead-acid??

    daestrom

    P.S. Leaving deep-cycle batteries open-circuit for a significant time will
    allow them to self-discharge. So they must be checked and recharged
    periodically. Letting them self-discharge and stay discharged is *not* a
    good thing for them.
     
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