Dometic 40 Amp MPPT Dual Bank Solar Controller for PowerTrak RV-C

The Dometic 40 Amp MPPT Dual Bank Solar Controller Handles Up to 900 Watts of Roof Solar and Keeps Both RV Batteries Charged on Your PowerTrak Network

The Dometic 40 Amp MPPT Dual Bank Solar Controller (model SC-DB-MPPT-40-12) is a UL 1741 listed maximum power point tracking charge controller with two battery outputs. It delivers up to 40 amps of total charge current from as much as 900 watts of solar at 12 volts. The main output charges your house bank, and a secondary output trickle charges the chassis or starter battery at up to 2.5 amps while the coach sits.

It belongs to the PowerTrak line and joins your coach's RV-C network, where a PowerTrak display shows its data and changes its settings. Order the controller alone if a PowerTrak display is already installed, or the kit that adds the display, a 25 foot RV-C harness and a terminating resistor harness.

Dometic 40 Amp MPPT Dual Bank Solar Controller Features

Room for Larger Arrays

At 40 amps and 900 watts at 12 volts, one controller covers a bigger roof than the 30 amp version. Its 96 volt open circuit input allows series strings for long cable runs, and up to eight controllers can be stacked on one system for up to 320 amps, or 6,400 watts of solar, using the PowerTrak branch connector.

MPPT With Partial Shade Detection

The controller follows the array's maximum power point as light and temperature change, with tracking efficiency up to 99.9% and conversion efficiency up to 98%. When shade creates several power peaks on a series string, it picks the highest one.

Main and Secondary Battery Outputs

Battery 1 charges at full current with the selected profile. Battery 2 receives an adjustable trickle charge of up to 2.5 amps and is never equalized, which suits a parked chassis battery. The controller powers up from Battery 1 or from energized panels, not from Battery 2 alone.

Profiles for Lead Acid and LiFePO4

Select Gel, AGM, Flooded, LiFePO4 or one of two Custom profiles. At 12 volts the bulk and absorption setpoint is 14.1 volts for Gel and 14.4 volts for the others, with a 120-minute absorption by default. Float is 13.7 volts for lead acid and 14.0 volts for LiFePO4. Flooded batteries receive a 14.9 volt equalize every 30 days by default. With a battery temperature sensor on the external port, lead acid charging is compensated at -24 mV per °C.

PowerTrak and RV-C Integration

The standard RV-C Molex port links the controller with the PowerTrak display and other PowerTrak devices, including Advanced Lithium batteries and the Advanced Inverter/Charger. DIP switches set the RV-C instance number. On the display you can watch solar power, voltage and current, both battery voltages, charge state, temperatures and daily amp hours, and the Go Power! Connect app reaches the controller through the display's Bluetooth.

Lever Terminals and Three Status LEDs

Remove the cover to reach push-in lever terminals that need no tools. Green, yellow and red LEDs report charging, warnings and faults.

Real-World Applications

Large motorhome roofs. Run up to 900 watts at 12 volts through one controller.

Installs that require UL 1741. Use a listed controller where your project calls for one.

Practical Comparison

SC-DB-MPPT-40-12 Versus the SC-DB-MPPT-30-12

Both share the same case size, dual outputs and PowerTrak integration. The 30 amp model handles 600 watts at 12 volts and holds full output without derating up to 131°F (55°C). The 40 amp model handles 900 watts, holds full output to 104°F (40°C), and is the one Go Power lists to UL 1741.

Buyer Guidance

Display, Array and Wiring

Battery type and other settings are changed on the PowerTrak display, and the factory default is AGM, so pick the display kit if your coach doesn't have one. Keep the array's open circuit voltage times 1.25 at or below 96 volts. Go Power recommends up to 600 watts on this controller to leave margin for cold, bright days, and estimates about 30Ah per 100 watts per day in spring and summer and 12Ah in fall and winter. The manual specifies 8 AWG with a 50 amp fuse to Battery 1 and 16 AWG with a 10 amp fuse to Battery 2, using wire rated at least 105°C. Keep runs within 25 feet from array to battery, 10 feet to Battery 1 and 20 feet to Battery 2. Fuses and a ground fault (GFDI) device are not included.

Mounting

Mount it indoors on a non-flammable wall, vertically with the terminals down and 6 inches of clearance above and below, as close to the battery as you can. Ground the chassis stud with 8 AWG wire.

This May Be A Good Fit If

• You need up to 40 amps of solar charging at 12 volts
• Your installation calls for UL 1741
• Your coach runs PowerTrak or another RV-C system
• You want to maintain a chassis battery from solar

Common Questions

Do I Need the Display Kit?

Not if your coach already has a PowerTrak display. Otherwise the kit lets you change profiles, see solar and battery data on a touchscreen and use the Go Power! Connect app, which connects through the display.

Does It Work With Lithium Batteries?

Yes. Choose the LiFePO4 profile on the PowerTrak display. Temperature compensation isn't used for lithium.

Can I Use It on a 24 Volt System?

The manual rates the SC-DB series for 12 or 24 volt nominal systems, with up to 1,800 watts of solar at 24 volts on this model. It's sold as a 12 volt model, so talk with the Outbound Power team before planning a 24 volt install.

What Warranty Does It Carry?

Go Power lists a 5-year warranty against defects in materials and workmanship.

What's Included

• 1 x Dometic SC-DB-MPPT-40-12 Solar Controller
• 4 x Mounting Screws (#8 x 1 In)
• 1 x Quick Start Guide
• 1 x PowerTrak Color Touchscreen Display (Controller + PowerTrak Display Kit)
• 1 x 25 Ft RV-C Harness (Controller + PowerTrak Display Kit)
• 1 x PowerTrak Terminating Resistor Harness (Controller + PowerTrak Display Kit)

More Solar for Your PowerTrak Coach

The Dometic 40 Amp MPPT Dual Bank Solar Controller gives a 12 volt coach up to 900 watts of MPPT charging, a maintained chassis battery and UL 1741 listing, all managed on your PowerTrak network. If you'd like help choosing the controller alone or the display kit, or planning RV-C harnessing, the Outbound Power team is happy to help.

Dometic 40 Amp MPPT Dual Bank Solar Controller for PowerTrak RV-C Manuals and Documents

Dometic SC-DB-MPPT-40-12 Manual

Dometic SC-DB-MPPT-40-12 Spec Sheet