For a cabin or off-grid home built around 120 V loads, with room to stack a second unit later. Rugged and code-friendly, but it idles high for its size.
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Every OutBack FXR A-Series model we rank, smallest first. Ratings compare each against its own size.
| Model | Continuous | Rating | Price |
|---|---|---|---|
| OutBack FXR3048A | 3,000 W | 3.5/5 | $2,314 |
| OutBack VFXR3648A (this one) | 3,600 W | 3.8/5 | $2,139 |
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
| Model number | VFXR3648A-01 |
|---|---|
| Output | |
| Type | Pure sine wave inverter-charger |
| AC output | 120 V |
| Continuous power | 3,600 W |
| Surge power | 5,400 W for 5 s |
| DC input range | 42 to 68 V |
| Idle draw | 34 W (0.7 A at 48 V) |
| Power-saving draw | 9 W |
| Peak efficiency | 93% |
| Connections | |
| AC outlets | 0 |
| GFCI outlets | No |
| Hardwire terminal | Yes |
| USB ports | None |
| Transfer switch | Yes |
| Pass-through rating | 60 A |
| Charger | 45 A |
| Lithium charge profile | Yes |
| Parallel units | Yes |
| Control and build | |
| Remote | Optional extra |
| App | Optional add-on |
| Display | No |
| Safety listing | ETL listed to UL 1741 (2nd Ed. with supplement SA) |
| Design | Low-frequency (transformer) |
| Cooling | fan |
| Dimensions | 12 x 8.25 x 16.25 in (30 x 21 x 41 cm) |
| Weight | 61 lb |
| Warranty | 5 years |
A strong 48 V inverter-charger for an off-grid home or whole-house backup on 120 V. It handles big loads, charges fast from a generator, and carries the certifications inspectors ask for.
Amazon Northern Arizona Wind & Sun $1,307.32A well-rounded 48 V inverter-charger for an off-grid cabin, backup system or large RV. Low idle draw, real certifications and Victron’s system integration make it a safe choice.
Amazon DRSA $1,052.30For a 48 V RV, cabin or backup system that needs a rugged, listed 120 V inverter-charger with big surge.
ResSupply $2,026 A1 Solar Store $2,531.49Compare the OutBack VFXR3648A with any other 48V inverter →
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