BougeRV Sunflow 40A
#18 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 is the better charge controller overall, rated 4.0 to 3.2. The BougeRV Sunflow 40A leads on value and features. The Morningstar TriStar MPPT 45 wins on warranty. The BougeRV Sunflow 40A costs $418.01 less ($139.99 vs $558).
Morningstar TriStar MPPT 45
#38 in MPPT solarFull review
For off-grid cabins and remote sites that want a proven, fanless 45 A controller. Most home and RV buyers get more for less elsewhere.
Amazon $558$558
Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the BougeRV Sunflow 40A for value ($3.50 per amp of charge current vs $12.40 per amp of charge current) and features (Bluetooth app, lithium profile, temperature sensor; 95 V PV limit vs temperature sensor, 150 V PV input; no Bluetooth).
- Choose the Morningstar TriStar MPPT 45 for warranty (5-year warranty vs 1.5-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every MPPT solar charge controller; a clear win is highlighted. How we rank explains each one.
| Factor weight | BougeRV Sunflow 40A | Morningstar TriStar MPPT 45 |
|---|---|---|
| Overall rating | 4.0/5 | 3.2/5 |
| Value 35% | 87 $3.50 per amp of charge current | 0 $12.40 per amp of charge current |
| Features 25% | 75 Bluetooth app, lithium profile, temperature sensor; 95 V PV limit | 30 temperature sensor, 150 V PV input; no Bluetooth |
| Efficiency 20% | 100 99% peak efficiency (maker rating) | 100 99% peak efficiency (maker rating) |
| Warranty 20% | 12 1.5-year warranty | 100 5-year warranty |
Specifications
| BougeRV Sunflow 40A | Morningstar TriStar MPPT 45 | |
|---|---|---|
| Charging | ||
| Type | MPPT solar charge controller | MPPT solar charge controller |
| Charge current | 40 A | 45 A |
| Battery voltage | 12/24 V | 12/24/36/48 V |
| Lithium profile | Yes | No |
| Custom profile | Yes | Yes |
| Temperature sensor | - | Optional extra |
| Peak efficiency | 99% | 99% |
| Standby draw | - | 225 mA |
| Inputs | ||
| Max PV voltage (Voc) | 95 V | 150 V |
| Max PV power (12 V) | 600 W | 600 W |
| Max PV power (48 V) | - | 2,400 W |
| Monitoring and build | ||
| Bluetooth | Built in | No |
| Display | Yes | No |
| Load output | Yes | No |
| Cooling | passive | passive (no fans) |
| Water resistance | - | IP20 (Type 1, indoor and vented) |
| Dimensions | - | 29.1 x 13.0 x 14.2 cm (11.4 x 5.1 x 5.6 in) |
| Weight | - | 9.2 lb |
| Warranty | 1.5 years | 5 years |
| Released | 2023-10 | 2009 |