MidNite Barcelona
#37 in MPPT solarFull review
For big off-grid or backup systems on a 48 V bank with long high-voltage strings. Overkill for small arrays.
Amazon $1,960$1,960
3.1/5
For large 48 V off-grid or backup systems built around OutBack inverters, where 300 V strings and built-in arc-fault protection simplify the install.
- 100 ACharge current
- 24/36/48 VBattery
- 300 V maxPV input
- 98.8%Efficiency
- 5 yearsWarranty
Check price at NAZ Solar Electric$1,494.66
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Handles up to 7,000 W of panels on a 48 V bank
- 300 V input allows long strings and fewer combiner runs
- Arc- and ground-fault protection built in for code compliance
- Outdoor-rated enclosure
Cons
- Needs an OutBack MATE3s to set up, an extra purchase
- No screen or Bluetooth on the unit
- Cannot charge a 12 V bank
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | FM100-300VDC-AFCI |
|---|---|
| Charging | |
| Type | MPPT solar charge controller |
| Charge current | 100 A |
| Battery voltage | 24/36/48 V |
| Custom profile | Yes |
| Temperature sensor | Optional extra |
| Peak efficiency | 98.8% |
| Standby draw | 104 mA |
| Inputs | |
| Max PV voltage (Voc) | 300 V |
| Max PV power (48 V) | 7,000 W |
| Monitoring and build | |
| Bluetooth | No |
| Display | No |
| Load output | No |
| Cooling | fan |
| Water resistance | IP54 (Type 3R) |
| Dimensions | 58.4 x 22.4 x 15.2 cm (23 x 8.8 x 6 in) |
| Weight | 16 lb |
| Warranty | 5 years |
Alternatives in this type
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
MidNite Classic 200
#40 in MPPT solarFull review
For off-grid homes and cabins that want a rugged, made-in-USA controller with network monitoring and longer strings than a 150 V unit. Also handles wind and hydro.
Amazon $709 NAZ Solar Electric $680$680
Compare
Compare the OutBack FLEXmax 100 AFCI with any other charge controller →
More from OutBack Power: every OutBack Power product ranked.