PWM Shunt Controller

Model: SR 12-15
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Application

  • A basic battery charge controller. This unit emphasizes extremely low cost and minumum interference.

Features

  • No sharp current transition = very low interference

  • Supports many battery types, adjustable float voltage
  • Charge and Full LED indicators

  • Highly stable and accurate voltage and temperature sensor, accurate over the full temperature range

  • EXTREMELY low nighttime draw

    • Basic Operation

    A major source of noise interference in PWM systems is the sharp voltage and current transisitons that happen when the Series PWM switch very quickly connects and disconnects the panel current to the battery to control the charge. Add a large panel and long panel wires and you have a perfect antennae to transmit all this electrical noise being created.

    This basic charge controller charges the battery by connecting the solar panels to the battery then shorts the panel (no power loss when shorted) and reconnects the panel to battery with PWM control. The battery sees a PWM style charge current with PWM control, however, since the panel current shorted is very close to panel current into the battery, there are no sharp transistions of panel current, hence minimal electrical interference.

    Electrical Specifications

    Base Model: SR 12-15
    Nominal battery voltages (V) 12
    Nominal battery voltages (V) 30
    Maximum Panel current (A) 15
    Maximum Charging Output (A) 20
    Self Consumption 0.5 ma from battery
    Effeciency >94% over 20% load

    Mechanical Specifications

    Weight:

    • 0.3 lbs.
    Size:
    • 5" X 4" X 1.5"
    Connections:
    • Power: Eurostyle Terminal Strip #10 AWG
    • Signal: Eurostyle Terminal Strip #14 AWG
    Operating Temperature:
    • -40 to 60 deg. C
    Humidity:
    • 0 - 90 % non-condensing

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

    Order Model No: SR 12-15

    March 2002