The Renogy PUH 3000W with Transfer Switch is the better 12V inverter overall, rated 4.0 to 2.0. The Renogy PUH 3000W with Transfer Switch leads on value, safety listing and features. The Go Power! GP-ISW3000 wins on warranty. The Renogy PUH 3000W with Transfer Switch costs $666.98 less ($461.97 vs $1,128.95).
A big inverter with automatic changeover for RVs and home backup that already have a separate charger. Renogy’s HF inverter-chargers add charging for more money.
Amazon $461.97For RVs that hardwire a 3,000 W inverter into a subpanel. Same hardware as the Cotek SP-3000-112.
Amazon $1,128.95Prices 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 over 2,000 W 12V inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Renogy PUH 3000W with Transfer Switch | Go Power! GP-ISW3000 |
|---|---|---|
| Overall rating | 4.0/5 | 2.0/5 |
| Value 30% | 77 $0.15 per continuous watt | 8 $0.38 per continuous watt |
| Idle draw 15% | 67 1.5 A idle (about 18 W) with nothing plugged in | 0 3.8 A idle (about 45.6 W) with nothing plugged in |
| Safety listing 15% | 100 UL certified to UL 458 and CSA C22.2 No. 107.1-01 | 0 no UL 458 or UL 1741 listing stated |
| Warranty 15% | 0 1-year warranty | 25 2-year warranty |
| Features 15% | 95 remote included, app, transfer switch, hardwire terminal | 28 optional remote, hardwire terminal; no app |
| Efficiency 10% | 78 92% peak efficiency (maker rating) | 56 90% peak efficiency (maker rating) |
| Renogy PUH 3000W with Transfer Switch | Go Power! GP-ISW3000 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter | Pure sine wave inverter |
| Continuous power | 3,000 W | 3,000 W |
| Surge power | 6,000 W for 2 s | 6,000 W |
| DC input range | 11 to 15.5 V | 10.5 to 16.5 V |
| Idle draw | 1.5 A (18 W) | 3.8 A (45.6 W) |
| Power-saving draw | - | 0.4 A |
| Peak efficiency | 92% | 90% |
| Connections | ||
| AC outlets | 3 | 0 |
| GFCI outlets | Yes | No |
| Hardwire terminal | Yes | Yes |
| USB ports | 1 | None |
| Transfer switch | Yes | No |
| Parallel units | No | No |
| Control and build | ||
| Remote | Included | Optional extra |
| App | Built in | No |
| Display | - | No |
| Safety listing | UL certified to UL 458 and CSA C22.2 No. 107.1-01 | No |
| Cooling | fan | load-controlled fan |
| Dimensions | 19.2 x 10.4 x 3.8 in | 442 x 255 x 158 mm (17.40 x 10.04 x 6.22 in) |
| Weight | 14.8 lb | 18.1 lb |
| Warranty | 1 year | 2 years |
