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 is the better charge controller overall, rated 4.0 to 3.9. The BougeRV Sunflow 40A leads on efficiency and features. The EPEVER Tracer 4210AN G3 wins on warranty. The EPEVER Tracer 4210AN G3 costs $21 less ($118.99 vs $139.99).
EPEVER Tracer 4210AN G3
#7 in MPPT solarFull review
A budget 40 A controller for owners who are happy setting it up on its own screen. Add the Bluetooth adapter if you want phone monitoring.
Amazon $118.99$118.99
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.
Which should you buy?
- Choose the BougeRV Sunflow 40A for efficiency (99% peak efficiency (maker rating) vs 98% peak efficiency (maker rating)) and features (Bluetooth app, lithium profile, temperature sensor; 95 V PV limit vs Bluetooth add-on, lithium profile, temperature sensor; no temperature sensor).
- Choose the EPEVER Tracer 4210AN G3 for warranty (2-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 | EPEVER Tracer 4210AN G3 |
|---|---|---|
| Overall rating | 4.0/5 | 3.9/5 |
| Value 35% | 87 $3.50 per amp of charge current | 94 $2.97 per amp of charge current |
| Features 25% | 75 Bluetooth app, lithium profile, temperature sensor; 95 V PV limit | 59 Bluetooth add-on, lithium profile, temperature sensor; no temperature sensor |
| Efficiency 20% | 100 99% peak efficiency (maker rating) | 75 98% peak efficiency (maker rating) |
| Warranty 20% | 12 1.5-year warranty | 25 2-year warranty |
Specifications
| BougeRV Sunflow 40A | EPEVER Tracer 4210AN G3 | |
|---|---|---|
| Charging | ||
| Type | MPPT solar charge controller | MPPT solar charge controller |
| Charge current | 40 A | 40 A |
| Battery voltage | 12/24 V | 12/24 V |
| Lithium profile | Yes | Yes |
| Custom profile | Yes | Yes |
| Temperature sensor | - | Optional extra |
| Peak efficiency | 99% | 98% |
| Standby draw | - | 8 mA |
| Inputs | ||
| Max PV voltage (Voc) | 95 V | 100 V |
| Max PV power (12 V) | 600 W | 520 W |
| Monitoring and build | ||
| Bluetooth | Built in | Optional add-on |
| Display | Yes | Yes |
| Load output | Yes | Yes |
| Cooling | passive | - |
| Water resistance | - | IP30 |
| Dimensions | - | 252 x 180 x 63 mm |
| Weight | - | 3.6 lb |
| Warranty | 1.5 years | 2 years |