The BougeRV Sunflow 40A MPPT Solar Charge Controller 12V/24V Charges 12V and 24V Batteries From Up to 1200W of Solar With Bluetooth Control
The BougeRV Sunflow 40A MPPT Solar Charge Controller 12V/24V manages solar charging for medium-size 12V and 24V off-grid systems. It charges at up to 40A from as much as 600W of solar on a 12V battery or 1200W on a 24V battery, and it accepts up to 100V of PV input.
BougeRV built it for RVs, camper vans, overlanding rigs and camping setups. It works with LiFePO4 and lead-acid batteries, has built-in Bluetooth and a 20A load output, and ships with a temperature sensor for cold-weather lithium protection.
BougeRV Sunflow 40A MPPT Solar Charge Controller 12V/24V Features
Room for a Medium-Size Array
The 40A rating covers up to 600W of panels at 12V and 1200W at 24V. PV input can reach 100V, with protection at 95V and recovery at 90V. MPPT tracking works from 2V above battery voltage up to 72V.
High-Efficiency MPPT Charging
BougeRV's manual rates MPPT tracking efficiency above 99% and charging conversion efficiency above 95%, so more of your panels' output goes into the battery.
Charge Current You Can Set
Set charging anywhere from 0 to 40A in 1A steps. A smaller battery bank can take a lower limit, and a larger bank can use the full 40A.
Battery Profiles for Lithium and Lead-Acid
Choose SLD, GEL, FLD, LI (LiFePO4) or USE for a custom profile. Lead-acid modes add automatic 12V/24V detection and temperature compensation. In LI mode you select 12V or 24V and can adjust the boost, reconnect and over-discharge voltages.
Cold-Weather Lithium Protection
Turn on lithium low-temperature charging protection and connect the included sensor, and the controller stops charging at 32°F (0°C) until the battery warms back to 35.6°F (2°C). The setting ships turned off, so switch it on during setup if you need it.
Phone Control, Display and Data Ports
Built-in Bluetooth reaches up to 33 ft without internet, and the BougeRV app shows live solar, battery and load data. You can also change key settings with the SELECT and ENTER buttons under the backlit LCD. The controller stores 200 days of history and has TTL and RS485 ports, with CAN (RV-C protocol) listed as optional.
Real-World Applications
Camper vans. Charge a 12V LiFePO4 battery from up to 600W of panels.
24V RV systems. Run up to 1200W of panels on a 24V battery bank.
Camp lighting. Use the 20A load output with light control, or light control plus a 1 to 14 hour timer.
Practical Comparison
MPPT Controller Versus PWM Controller
A PWM controller is the simpler type for panels matched to battery voltage. This MPPT controller accepts up to 100V of PV input, so it can work with higher-voltage panel strings.
Sunflow 40A Versus a Higher-Amp MPPT Controller
A higher-amp controller supports a bigger array. The 40A model fits medium-size systems up to 1200W at 24V, and its adjustable current lets you match a smaller battery bank.
Buyer Guidance
Wiring and Setup
Connect the battery to the controller first and the solar panels last. Keep the array's open-circuit voltage under 100V and its output current within the 40A rating. The manual's wiring diagram shows a fuse on the battery line. Keep the controller away from water, and make sure the battery area has enough ventilation for charging gases.
This May Be A Good Fit If
- Your array is up to 600W at 12V or 1200W at 24V
- You charge a LiFePO4 or lead-acid battery
- You want Bluetooth, RS485 and load control in one unit
Common Questions
Does It Detect 12V or 24V on Its Own?
For lead-acid batteries, yes. For lithium batteries, the manual says to select 12V or 24V in the menu or the app.
How Big Is It?
It measures 227 x 159.6 x 75 mm (8.94 x 6.28 x 2.95 in) and weighs 1789 g (3.94 lbs).
What Warranty Does It Have?
BougeRV lists an 18-month warranty.
What's Included
- 1 x BougeRV Sunflow 40A MPPT Solar Charge Controller 12V/24V
- 1 x Temperature Sensor
- 1 x Set of Wiring Terminals
- 1 x User Manual
MPPT Control for Medium-Size Solar Systems
The BougeRV Sunflow 40A MPPT Solar Charge Controller 12V/24V supports up to 1200W of solar, adjustable 0 to 40A charging, lithium cold-weather protection and Bluetooth control. If you're planning an array and want help sizing it, the Outbound Power team is happy to help.
BougeRV Sunflow 40A MPPT Solar Charge Controller 12V/24V Specifications
|
| Electrical |
| Model |
BJ2440N |
| System Voltage |
12V/24V (auto detection for lead-acid only) |
| Rated Charging Current |
40A |
| Charge Current Adjustment |
0 to 40A, 1A steps |
| Maximum PV Input Voltage |
100V (95V protection, 90V recovery) |
| MPPT Operating Voltage Range |
Battery voltage + 2V to 72V |
| Maximum PV Input Power |
600W (12V), 1200W (24V) |
| MPPT Tracking Efficiency |
Above 99% (manual) |
| Charging Conversion Efficiency |
Above 95% (manual) |
| Rated Load Current |
20A |
| Battery Operating Voltage Range |
8V to 32V |
| No-Load Loss |
10mA or less |
| Grounding |
Common negative |
| Charging |
| Battery Types |
SLD (default), GEL, FLD, LI (LiFePO4), USE (custom) |
| LI Boost Charging Voltage |
14.4V default; 9 to 17V (12V), 18 to 34V (24V) |
| LI Boost Charging Reconnect Voltage |
13.2V default (12V system) |
| LI Over-Discharge Voltage |
11.1V default (12V system) |
| LI Over-Discharge Reconnect Voltage |
12.6V default (12V system) |
| Overvoltage Disconnect Voltage |
16.0V (12V system) |
| 24V System Voltage Points |
12V values x2 |
| Lead-Acid Temperature Compensation |
-3 mV/°C/2V |
| Lithium Low-Temperature Charging Protection |
Stops at 32°F (0°C), resumes at 35.6°F (2°C); off by default, needs temperature sensor |
| Lead-Acid Constant Voltage Output |
Optional setting to activate an over-discharged lead-acid battery |
| Protection |
| Protections |
PV overvoltage, PV reverse connection, PV short circuit, night reverse charging, input power limit, over-temperature, load short circuit, overload, battery over-voltage/over-discharge, battery reverse connection, battery end short circuit |
| Controller Over-Temperature |
Charging stops above 75°C, resumes below 70°C |
| Protection Grade |
IP34 |
| Monitoring |
| Display |
Backlit LCD with SELECT and ENTER buttons |
| Bluetooth |
Built in, up to 33 ft, no internet needed |
| App Requirements |
iOS 13.0 or Android 8.0 and later, Bluetooth and GPS on |
| Historical Data |
Last 200 days |
| Communication Ports |
TTL (9,600 bps), RS485 (RJ45, 5V/200mA), CAN (optional, RV-C) |
| Working Modes |
Load mode, no-load mode, viewing mode |
| Load Modes |
Always on, manual, light control, light control + timer (1 to 14 h) |
| Size and Weight |
| Dimensions |
227 x 159.6 x 75 mm (8.94 x 6.28 x 2.95 in) |
| Mounting Hole |
5 mm |
| Weight |
1789 g (3.94 lbs) |
| Operating Temperature |
-31°F to 149°F (-35°C to 65°C) |
| Cooling |
Natural heat dissipation |
| Warranty |
| Warranty |
18 Months |
BougeRV Sunflow 40A MPPT Solar Charge Controller 12V/24V Manual
