20 Amp. Dual Battery Solar Controller

Charging of two independent battery banks:
The owner can set charging priority between the two battery banks in steps of 10%. For example, you can decide that 90% of the solar current should go to the house battery and 10% to the start battery.  When one battery bank is full all the power is redirected to the other battery.

Battery optimized charging algorithms:
• Advanced PWM four stage algorithm with bulk, absorption, float and boost (equalization) charging.
• Charging voltages are optimized for the selected lead-acid battery type (liquid, sealed or gel).
• Selectable PWM charging frequency (25, 50 or 100Hz)
• Temperature compensated charging using either a built-in temperature sensor or an optional remote sensor.

Specifications - Controller:

• For 12V and 24V systems (nominal voltage), automatically sensed. Charging voltages given below should be multiplied by 2 for 24V operation.
• Max solar current 10 A  for smaller panels or 20 A  for larger panels (greater than 150 watts)
• Absorption voltage 14.2V (sealed battery), 14.4V (flooded battery), 14.6V (industrial battery) or
• Boost voltage 30 min 14.4V (sealed battery), 14.6V (flooded battery), 14.8V (industrial battery)
• Float voltage 13.7V (all battery types)
• Max intrinsic power use 4 mA at night, 10 mA when charging
• Protected against short circuits, over-currents, reverse currents and lightning
• Temperature range for use : from -35°C to +55°C
• Temperature compensation -30 mV/°C
• 4 mm2 (10-12 AWG) max wire size terminals to solar panel and batteries
• 1.5 mm2 (16 AWG) terminals for optional remote temperature sensor
• RJ45 connector for cable to optional remote display
• IP22 ingression protection
• Circuit protected against high humidity
• Minimum operating voltage: 8 Volts