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20 Amp Solar Control - For Dual Battery Systems (Boat & RV)

Dual Battery Charging - charges two separate batteries using only one solar module. Perfect for boats, RVs and other systems with two batteries. Charges both batteries together, optional battery 1 priority charging first (S10D only)

3 Stage Charging - 1. Bulk charging (three flashes), 2. Absorption charge where voltage is limited (two flashes), 3. Float charge when the battery has been at the charge set point for a long time the voltage is reduced to a lower setting (one flash).

Models: S20D, (-24V)

• Protection (PV & Batt), against short-circuit* & reverse polarity*, overload, over temperature & battery removal (*except 24V model)
• Extreme design –40° to +50°C (-40° to +120°F)
• Temperature Compensation
• Reliable - 100% solid state
• No need to derate
• Stainless steel case
• 5 year warranty
• Manufactured with solar power
• Designed and built in North America

Electrical Specifications
Voltage configurations 12 or 24 volts (custom voltages 6 to 36 volts)
Consumption 0.2 mA at night, 0.6 mA, 3.3 mA when charging
Max. input 40 volts (12V control), 60V (24V control)
Max. Charging current 20 amps DC
Status Light: 1 LED (3 flashes charging, 2 flashes at Bulk Voltage, 1 flash in Float Mode)
Regulation method Pulse Width Modulation PWM, positive side switching
Typical set points: Bulk:14.4 Volts, Float:13.6 Volts, Temperature Compensated (custom voltages available)

General Specifications
Temperature range: –40° to +50°C or +120°F
Case: Stainless steel case
Weight: 440 grams (15.6 oz)
Size (H x W x D): 8 x 14 x 4.5 cm (3.125 x 5.5 by 1.75 inches)
Mounting: wall mountable
Terminals: 12-24 AWG

PWM Off (to ensure no radio interference)
Temperature Compensation Off
Custom voltage setpoints
Custom wire lead lengths
Lithium Battery (no charging below 4C)

Install Manual (pdf)