20-amp MPPT Solar Controller

Perfect for fleet applications, this industrial Maximum Power Point Tracking (MPPT) charge controller features a robust, fully-sealed (IP68) housing that resists vibration, dust, water, and insects.

SKU: GP-MPPT-85-20 Category:


Use a solar controller to maintain a battery’s life by limiting the current flowing into it once it is fully charged.

  • IP68 rated waterproof protection with MC4 solar connections and Delphi battery connections
  • Up to 98% power conversion efficiency
  • 3-stage I/U curve sweep algorithm increases battery lifespan
  • Anodized aluminum with built-in heat dissipation
  • Fully encapsulated design prevents damage from water, corrosion, insects and/or dust
  • Works with 12 or 24V battery systems (automatic battery voltage detection)
  • Compatible with 60-cell modules
  • Converts excess array voltage into additional charging current
  • Allows up to 50% oversized array power for adding additional capacity in low-insolation months
  • 5 year warranty

System Voltage

12/24V (auto-recognition)

Temperature Compensation

-25mV / K (12V systems), – 50mV/K (24V Systems)

Battery Voltage Range (min. – max.) [V]

9V – 15.5V (12V system), 18 – 31V (24V system)

Max Charge Current


Float Charge (Default= SEALED)

13.8/27.6V (25°C)

Main Charge (Default= SEALED)

14.1/28.2V (25°C), 0.5h Daily

Boost Charge (Default- SEALED)

14.4/28.8V (25°C), 2h, Activation: Battery Voltage <12.3/24.6V

Equalization Charge (Flooded)

14.9/29.8 (25°C),2h, Activation: Battery Voltage <12.1/24.2V (at least every 30 days)


88.5 x 112 x 41.4 mm



Type of Protection



5 Years