SLA Float charger

Discussion in 'The Projects Forum' started by ShayanFiroozi, May 1, 2016.

  1. ShayanFiroozi

    Thread Starter Member

    Nov 18, 2015
    41
    1
    Hi
    what guys think about this SLA float charger ??
    is it good and safe to leave battery permanently with it ???

    thank you
     
  2. ian field

    Distinguished Member

    Oct 27, 2012
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    784
    Various commercial "intelligent" chargers do this - the Optimate charger I have throttles back to 13.6V to maintain the battery with minimum gassing.

    If you go for your own design; I'd suggest a comparator that trips at 14.4V and flips a bistable that sets the charge voltage down to 13.6V

    The absolute simplest is a constant current charger that switches in a 13.6V shunt regulator - but you have to feed from the shunt to the battery via a rectifier so the shunt can't discharge the battery.
     
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    I tried that and it was crap.
    So I built one using a LM723
     
    #12 likes this.
  4. recklessrog

    Member

    May 23, 2013
    338
    102
    It looks very similar to a charger for a golf buggy I repaired last year.
     
  5. ian field

    Distinguished Member

    Oct 27, 2012
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    There's an "old standard" SLA charger based on an L200 regulator chip floating about the web somewhere.

    One version has a chain of diodes for temperature compensation.
     
  6. ShayanFiroozi

    Thread Starter Member

    Nov 18, 2015
    41
    1
    i need a float charger for SLA 2.2 AH to 12 AH and i have to leave the battery plugged to the charger permanently
    any circuit or link suggestion please ?

    thanks again
     
  7. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    There are dedicated charge controller chips. Why not build a charger based on one of those?
     
  8. ShayanFiroozi

    Thread Starter Member

    Nov 18, 2015
    41
    1

    Hi
    because i', not familiar with electronics at all !!
    i'm a IT man (network,programming)
    could anyone please help me or send me a circuit
     
  9. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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