48 V @ 20 Amp Charge Controller

Application

This charge controller is used to charge a battery from a PV power Source. This charge controller can be ordered with a special float voltage to charge small batteries used for Video or digital cameras or small security camera systems. This unit may also be adjusted to charge a lower voltage battery form a higher voltage power source.

Model: PT 48-20

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Features

  • Single unit 12/24 V operation
      • Will even charge a 12 V battery from a 24 V array or odd voltage CD-TE or amorphous silicon array.

  • Real world 15 - 30 % more current than conventional technology into discharged batteries
      • Means faster battery charging or higher system power at similar cost

  • Current Limited output - Can operate from multiple input sources

  • Maximizes Battery Life Dual Float Charge Technique Recommended by battery manufacturers (1) for maximum capacity and lifetime

  • Transient Protection

  • Low Noise

  • Overvoltage Protection

      • Regulates output at float level even without batteries connected (or bad batteries). Will substantially recover lost battery if recoverable.

    Electrical Specifications

    Nominal Voltage (V) 48
    Nominal PV Array (V) 48
    Max Array Voltage (V) 90
    Max Output (A) 20
    Self Consumption (A)
    Charging 0.04
    Quiescent 0.02
    Setpoint Tolerance (+/-) 5%
    Float Setting **(V) 56.4
    Overcharge Setting (V) 57.2
    Temp. Comp. mv/Deg C -4
    Efficiency 96%

    ** Special units have a suffix of B XX after the part number. The float value of the charge controller is XX. For example PT 48-20 B36 will charge a 36 battery to 42 V from a nominal 48 V solar panel. Note that the charge current increase by the ratio of approx. 60/42. Thus a 1 amp 48 V nominal solar panel will charge the li-ion battery at approx. 1.5 amps.

    Temperature Compensation:

    • Uses a National LM335Z temperature sensor available from Solar Converters Inc. Model TC-2

    LVD Control:

    • Short these terminals together with a relay contact, (rated 32 V @ .1 A - be careful of dry contacts) or a similiarly rated transistor and the LVD will open; forming an effective load disconnect. Used for Battery Backed Solar Water pumping as a Float Switch Control.

    Mechanical Specifications

    Weight: approx. 3 lbs.

    Size: approx. 8" X 6" X 2"

    Operating Temperature:

    • -40 to 60 deg. C
    • We suggest the unit not be placed in direct sunlight

    Humidity:

    • 0 - 90 % non-condensing
    • 0 - 100 % when mounted in a Nema enclosure

    Connections

  • Power:
      • Battery, PV and Load Terminals #4 - #22 AWG Eurostyle Terminal Strip
  • Signal:
      • Temperature Compensation, LVD Control, and 12/24 operation Terminals Eurostyle terminal strip: #16 - #26 AWG
  • Setup:
      • Special unit may be ordered that are jumper selectable for 12/24 battery

    Mechanical Drawing: Click here for picture

    Note: In the interest of continuous product improvement, specifications subject to change without notice.

    Order Model No:

    PT 48-20

    PT 48-20 BXX for difFerent battery voltages where XX is the full charge battery voltage

    March 2002