The Morningstar GenStar MPPT 80 is the better charge controller overall, rated 3.8 to 3.6. The Morningstar GenStar MPPT 80 leads on features and efficiency. The OutBack FLEXmax 80 wins on value. The OutBack FLEXmax 80 costs $644.01 less ($527.99 vs $1,172).
For off-grid homes and remote sites that want one controller with full networking, a load output and Morningstar’s fanless reliability. Hard to justify for a simple RV or cabin system.
Amazon $1,236 NAZ Solar Electric $1,172For off-grid homes and cabins on 24 or 48 V, especially those built around OutBack inverters. A proven 80 A controller at a fair price.
NAZ Solar Electric $527.99Prices 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 | Morningstar GenStar MPPT 80 | OutBack FLEXmax 80 |
|---|---|---|
| Overall rating | 3.8/5 | 3.6/5 |
| Value 35% | 0 $14.65 per amp of charge current | 45 $6.60 per amp of charge current |
| Features 25% | 100 Bluetooth app, lithium profile, temperature sensor, 200 V PV input | 30 temperature sensor, 150 V PV input; no Bluetooth |
| Efficiency 20% | 100 99% peak efficiency (maker rating) | 86 98.4% peak efficiency (maker rating) |
| Warranty 20% | 100 5-year warranty | 100 5-year warranty |
| Morningstar GenStar MPPT 80 | OutBack FLEXmax 80 | |
|---|---|---|
| Charging | ||
| Type | MPPT solar charge controller | MPPT solar charge controller |
| Charge current | 80 A | 80 A |
| Battery voltage | 12/24/48 V | 12/24/36/48/60 V |
| Lithium profile | Yes | - |
| Custom profile | Yes | Yes |
| Temperature sensor | Included | Optional extra |
| Peak efficiency | 99% | 98.4% |
| Standby draw | 200 mA | 83 mA |
| Inputs | ||
| Max PV voltage (Voc) | 200 V | 150 V |
| Max PV power (12 V) | 1,075 W | 1,000 W |
| Max PV power (48 V) | 4,300 W | 4,000 W |
| Monitoring and build | ||
| Bluetooth | Built in | No |
| Display | Yes | Yes |
| Load output | Yes | No |
| Cooling | passive (fanless) | fan (active cooling) |
| Water resistance | IP20 | Indoor Type 1 |
| Dimensions | 360.4 x 222 x 170.2 mm (14.2 x 8.75 x 6.70 in) | 41.3 x 14.6 x 11.4 cm (16.25 x 5.75 x 4.5 in) |
| Weight | 15.6 lb | 12.2 lb |
| Warranty | 5 years | 5 years |
| Released | 2023-06 | 2008-07 |
