Dual Battery Bank Controller

Dual Bank Battery 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.

EP Duo Solar Controller

This controller is designed specifically for charging two independent battery banks.

Charge controller for dual battery systems
Model EP Duo 12/24V 10A (for 50 - 140 Watts of solar energy)
Model EP Duo 12/24V 20A (for 150 - 280 Watts of solar energy)
(We no longer carry these but they are easily found elsewhere)

Both models offer the following advanced features:

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.

External display with charging data (option):
• External backlit LCD display can be mounted recessed or in a provided frame up to 10 m (33 ft) from the charge controller.
• Display shows charging voltage, actual current, max current and total amp-hours provided by the solar panels.
• Display shows current, minimum and maximum voltage of each battery bank as well as charge provided in amp-hours.
• Other information includes temperature, time, charge priority and frequency settings and troubleshooting information.

Dimensions:
• Charge controller: 6" x 3 1/16" x 1 3/8" (155 x 77 x 35 mm).
Weight 8.8 oz. (250 g) for 10A model, 10.6 oz. (300 g) for 20A model.
• Remote display: Cutout hole if flush mounted: 3"(75 mm), face plate 3 3/4" x 3 3/4" x 5/16" .
Frame mounted dimensions 4 1/2" x 41/2" x 1 9/16" (112 x 112 x 40 mm). Weight 5.3 oz. (150 g)

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

Click here to see the Duo Controller Instruction Manual

Wiring a Dual Output Solar Controller

A Typical Wiring Diagram for Charging Two Battery Banks Using Two Solar Panels and Our Dual Output Solar Controller

Remote Display

Remote Solar Panel Controller Display Showing Panel Output and Battery Condition

This optional remote display provides all the information you need to track the performance of your solar panel. It is particularly useful when optimizing panel tilt using our top-of-pole mounting system.

The display plugs into the Dual Bank Battery Controller.

Features include:

Monitors and Displays Solar Charge Rates
Monitors and Displays Condition and Charge of both Battery Banks.
Solar Charge shown in volts, amps, amp/hr. rate, and frequency rate.
Displays % of charge for both batteries.
Battery Charge shown in volts, volts min., volts max., and amp/hr. stored.
Displays both Battery Banks Separately.
Displays Time and Local Temp.
Optional RTS Displays Battery Temp. and Adjusts Charge Rate.
Adjustable Backlighting
Adjustable Data Repeat.
10 Meter Cable
RJ45 connector for cable to charge controller
Max intrinsic power use 17mA with no backlight, 20mA with low backlight and 23mA with bright backlight

Remote Temperature Sensor

The optional remote temperature sensor constantly measures and displays storage battery temperature so the controller can adjust charge rate appropriately. This is especially important when using temperature sensitive gel batteries. This option will increase battery life by 100-200 charge/discharge cycles.

The sensor plugs into the Dual Bank Battery Controller and is attached to the top of a battery in the battery bank with tape.

Dual Battery Bank Controllers

Shop All

10 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

Shop Now

20 Amp. Dual Battery Solar 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