BougeRV Sunflow 40A
#5 in MPPT solarFull review
A low-cost 40 A controller with app monitoring built in, for 12/24 V van and RV systems up to about 600 W.
Amazon $139.99$139.99
The BougeRV Sunflow 40A rates 4.0 among MPPT solar charge controllers; the Renogy 12V 40A DC-DC Charger rates 3.8 among DC-DC ones. The BougeRV Sunflow 40A costs $37.65 less ($139.99 vs $177.64).
Renogy 12V 40A DC-DC Charger
#4 in DC-DCFull review
A cheap, quiet way to add alternator charging to a van or camper with a lithium house battery. Pay more for Victron if you want built-in Bluetooth.
Amazon $177.64$177.64
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different type classes (MPPT solar and DC-DC), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | BougeRV Sunflow 40A | Renogy 12V 40A DC-DC Charger |
|---|---|---|
| Overall rating | 4.0/5 | 3.8/5 |
| Value 35% | 87 $3.50 per amp of charge current | 87 $4.44 per amp of charge current |
| Features 25% | 75 Bluetooth app, lithium profile, temperature sensor; 95 V PV limit | 82 Bluetooth add-on, lithium profile, temperature sensor, smart-alternator support |
| Efficiency 20% | 100 99% peak efficiency (maker rating) | 50 94% peak efficiency (maker rating) |
| Warranty 20% | 12 1.5-year warranty | 25 2-year warranty |
Specifications
| BougeRV Sunflow 40A | Renogy 12V 40A DC-DC Charger | |
|---|---|---|
| Charging | ||
| Type | MPPT solar charge controller | DC-DC charger |
| Charge current | 40 A | 40 A |
| Battery voltage | 12/24 V | 12 V |
| Lithium profile | Yes | Yes |
| Custom profile | Yes | Yes |
| Temperature sensor | - | Included |
| Peak efficiency | 99% | 94% |
| Standby draw | - | 15 mA |
| Inputs | ||
| Max PV voltage (Voc) | 95 V | - |
| Max PV power (12 V) | 600 W | - |
| DC input range | - | 12 to 16 V |
| Isolated | - | No |
| Smart alternator | - | Yes |
| Ignition sensing | - | Yes |
| Monitoring and build | ||
| Bluetooth | Built in | Optional add-on |
| Display | Yes | No |
| Load output | Yes | No |
| Cooling | passive | passive (fan-free) |
| Dimensions | - | 9.31 x 6.00 x 2.30 in |
| Weight | - | 4.1 lb |
| Warranty | 1.5 years | 2 years |