Battery Tender 50 Amp 12V/24V/36V/48V Solar Charge Controller


The Battery Tender 021-1177 is a 50 amp solar panel controller that delivers efficient PWM charging to increase battery life and improve performance. Compact and easy to install, this advanced charge controller is designed for remote power solar applications and can be used with 12 Volt, 24 Volt, 36 Volt, and 48 Volt lead-acid and AGM batteries and 12 Volt lithium batteries. Once hooked up, the controller will automatically detect the voltage of the battery and then begin regulating the charge from the connected solar panel.


  • Efficient Power Width Modulation (PWM) Charging
  • Battery Compatibility
    • 12V, 24V, 36V and 48V Lead Acid / AGM
    • 12V Lithium
  • Maximum Input Voltage: 100V
  • Maximum Input Power:
    • 12V @ 750 Watt
    • 24V @ 1500 Watt
    • 36V @ 2250 Watt
    • 48V @ 3000 Watt
  • Maximum Ouput: 12VDC, 50 Amp
  • USB Output: 2 Ports, 5VDC, 3.4 Amp

Three Stage Charging

  • Initialization: determining correct connection, battery voltage and charge level
  • Low Voltage Protection: when the battery drops below the selected voltage, the output load will turn off and the battery will recharge (default 10V)
  • Low Voltage Recovery Re-Engage: when the battery has charged back up to the selected voltage, the output load will turn on (default 12.5V)


  • Temperature Sensor Cable for Lead Acid and AGM Batteries

More Information
Part Number 021-1177
Charger Mode Automatic
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