The Victron SmartSolar MPPT 100/20-48V is the better charge controller overall, rated 4.3 to 4.0. The Victron SmartSolar MPPT 100/20-48V leads on warranty. The BougeRV Sunflow 40A wins on value and efficiency. The Victron SmartSolar MPPT 100/20-48V costs $46.49 less ($93.50 vs $139.99).
For small 48 V systems with one or two strings of panels, such as a shed, pump or backup bank. A dependable, inexpensive Victron with the app and a five-year warranty.
Amazon $96.31 DRSA $93.50A low-cost 40 A controller with app monitoring built in, for 12/24 V van and RV systems up to about 600 W.
Amazon $139.99Prices 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.
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 | Victron SmartSolar MPPT 100/20-48V | BougeRV Sunflow 40A |
|---|---|---|
| Overall rating | 4.3/5 | 4.0/5 |
| Value 35% | 71 $4.67 per amp of charge current | 87 $3.50 per amp of charge current |
| Features 25% | 77 Bluetooth app, lithium profile, temperature sensor; no temperature sensor | 75 Bluetooth app, lithium profile, temperature sensor; 95 V PV limit |
| Efficiency 20% | 75 98% peak efficiency (maker rating) | 100 99% peak efficiency (maker rating) |
| Warranty 20% | 100 5-year warranty | 12 1.5-year warranty |
| Victron SmartSolar MPPT 100/20-48V | BougeRV Sunflow 40A | |
|---|---|---|
| Charging | ||
| Type | MPPT solar charge controller | MPPT solar charge controller |
| Charge current | 20 A | 40 A |
| Battery voltage | 12/24/36/48 V | 12/24 V |
| Lithium profile | Yes | Yes |
| Custom profile | Yes | Yes |
| Temperature sensor | Optional extra | - |
| Peak efficiency | 98% | 99% |
| Standby draw | 10 mA | - |
| Inputs | ||
| Max PV voltage (Voc) | 100 V | 95 V |
| Max PV power (12 V) | 290 W | 600 W |
| Max PV power (48 V) | 1,160 W | - |
| Monitoring and build | ||
| Bluetooth | Built in | Built in |
| Display | No | Yes |
| Load output | Yes | Yes |
| Parallel units | Yes | - |
| Cooling | passive (no fan) | passive |
| Water resistance | IP43 (electronics), IP22 (connection area) | - |
| Dimensions | 100 x 131 x 60 mm | - |
| Weight | 1.4 lb | - |
| Warranty | 5 years | 1.5 years |
| Released | - | 2023-10 |
