14.5vdc PSU for battery charging

Discussion in 'Motorhome Accessories' started by Ridgeway, Apr 18, 2016.

  1. Ridgeway

    Ridgeway Funster

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    OK so this is slightly out of the usual motorhome question but If you pardon the pun "I could find any where else to stick it".....

    So this relates to a battery back up system for my aquarium, it does relate to my camper in that the more hours of autonomy we have = the further we can range form the house :)

    So I use 4 x 12v sealed lead batteries as battery backups. These are made for the aquarium trade and used on pumps to keep things going if there's a power out. I have 4 of these which gives me around 20hrs coverage. The batteries need replacing so I've just sourced some replacement units for this however being the muppet that I am I have lost 2 of the power supply units to charge them...... on the ones that I still have they are marked as:

    14.5vdc 1.6amp

    and the batteries are

    12vdc 18Ah

    Going via the manufacturer only brings crazy priced PSU's so I'm looking to source some standard items and found some marked as follows:

    15v 5A here

    Will the 15v vs the 14.5v be an issue ? as I can't find any low cost 14.5v items. The ones above are for laptop charging so although are for batteries there could be a difference in the lead vs lithium requirements ?

    Help
     
  2. stevec

    stevec Funster

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    Probably a bit high but you can reduce the volts by putting a 10A diode in series with it. Drops about 0.7V per diode. Not the best solution but workable.
     
  3. Lenny HB

    Lenny HB Funster

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  4. Ridgeway

    Ridgeway Funster

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    Thanks, have had a look at these but they only have a 12v output which I would have thought is too low to charge that battery ?
     
  5. Lenny HB

    Lenny HB Funster

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    They say they are for 12 v batteries which require 14.4 volts to charge, so should be OK.
     
  6. Ridgeway

    Ridgeway Funster

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    OK cheers, have ordered one so will try it out.

    Thanks
     
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