The Victron Phoenix 12/800 is the better 12V inverter overall, rated 3.7 to 2.1. The Victron Phoenix 12/800 leads on safety listing, warranty and value. The Go Power! GP-ISW700 wins on efficiency. The Victron Phoenix 12/800 costs $84.84 less ($271.15 vs $355.99).
A solid mid-size inverter for vans and boats that run electronics, a blender or power tools. Victron build quality and a five-year warranty justify the price over budget brands.
Amazon DRSA $271.15For campers who want a small, efficient inverter for electronics and a fridge, without needing a listed unit.
Amazon $355.99Prices 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 up to 1,000 W 12V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Victron Phoenix 12/800 | Go Power! GP-ISW700 |
|---|---|---|
| Overall rating | 3.7/5 | 2.1/5 |
| Value 30% | 54 $0.34 per continuous watt | 19 $0.51 per continuous watt |
| Idle draw 15% | 44 0.7 A idle (about 8 W) with nothing plugged in | 0 1.5 A idle (about 18 W) with nothing plugged in |
| Safety listing 15% | 100 LabTest certified to UL 458 (certificate LC20760-1) | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 100 5-year warranty | 25 2-year warranty |
| Features 15% | 25 optional remote, app add-on; no hardwire terminal | 12 optional remote; no app |
| Efficiency 10% | 56 90% peak efficiency (maker rating) | 67 91% peak efficiency (maker rating) |
| Victron Phoenix 12/800 | Go Power! GP-ISW700 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter | Pure sine wave inverter |
| Continuous power | 800 W | 700 W |
| Surge power | 1,200 W for 15 s | 1,230 W |
| DC input range | 9.2 to 17 V | 10.5 to 16.5 V |
| Idle draw | 0.7 A (8 W) | 1.5 A (18 W) |
| Power-saving draw | 0.1 A | 0.1 A |
| Peak efficiency | 90% | 91% |
| Connections | ||
| AC outlets | 2 | 2 |
| GFCI outlets | Yes | Yes |
| Hardwire terminal | No | No |
| USB ports | None | None |
| Transfer switch | No | No |
| Parallel units | No | No |
| Control and build | ||
| Remote | Optional extra | Optional extra |
| App | Optional add-on | No |
| Display | No | No |
| Safety listing | LabTest certified to UL 458 (certificate LC20760-1) | No |
| Cooling | fan | load-controlled fan |
| Dimensions | 95 x 231 x 334 mm (3.7 x 9.1 x 13.0 in) | 330 x 200 x 83 mm (13.00 x 7.87 x 3.27 in) |
| Weight | 11 lb | 5.7 lb |
| Warranty | 5 years | 2 years |
