Lead Acid Battery charger unit

Discussion in 'General Electronics Chat' started by superway, Mar 11, 2011.

  1. superway

    Thread Starter Active Member

    Oct 19, 2009
    128
    0
    Hello,

    I have a batter charger which is used to charge scooter batteries.
    Input: 120vac - 240vac
    current 4.5A

    Output: 48vdc, the maximum is 56vdc
    Charger current 5A, 240W

    What is the posible ways to test this unit inside the house and to make sure it works before installing outside station for charging? Do we need any load or additional power supply to test this charger? please show me the steps how to do it?

    Thanks in advanced.

    Ken
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,792
    946
    4 12 volt batteries would be the ideal test.

    OR build a resistor load bank $$$$$$

    Use ohms law to get the resistance value you need. You will want to test it at about 90% of full output rating. If your resistance bank is rated for less than 300 watts you will only be able to use the load for short periods(a few seconds)
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The resistor idea may not work; some chargers won't charge batteries if they are below a certain threshold.

    You need to make certain that the charger does not exceed the maximum recommended charge rate of the batteries. Look up the datasheet for the specific batteries installed in your scooter(s).
     
  4. superway

    Thread Starter Active Member

    Oct 19, 2009
    128
    0
    I agreed with SgtWookie. I tried to load resistors according to specs., but it did not show the state of charges, just the voltage vs. current and power. Is there any way to decrease the voltage below threshole to verify the LEDs status of charge?

    Thanks

    Ken
     
  5. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    Bring it on over -- I've got a 1.6 kW pot that will test it just fine... :p

    BTW, that's a quarter sitting on the thing.
     
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  6. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,792
    946
    You said you needed to TEST the charger.

    NOW you need to know if the state of charge of the battery jives with the LED display?


    What exactly do you need dude?
     
  7. superway

    Thread Starter Active Member

    Oct 19, 2009
    128
    0
    Yes, I need to test the Battery Charger.
    In the front panel of Batt. Charger, there are 4 LEDs that indicate the charging status of 4 batteries. I can use 4 batteries to test this charger, but I have to discharge all 4 batteries everytime I test the charger to see how 4 LEDs show the charging status, and this way will take long time to test every charger unit if I have to test 100 charger units. My question is there any way to setup a test equipment to test the charger and verify 4 LEDs working correctly without using 4 batteries?
    Thanks
     
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