The Renogy PUH 3000W with Transfer Switch rates 4.0 among over 2,000 W 12V inverters; the Magnum Energy MS2812 rates 3.5 among inverter-chargers ones.
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 full-time RVers who want a rugged low-frequency inverter-charger that will start air conditioners and charge fast from a generator.
Prices 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.
These two sit in different size classes (over 2,000 W and inverter-chargers), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Renogy PUH 3000W with Transfer Switch | Magnum Energy MS2812 |
|---|---|---|
| Overall rating | 4.0/5 | 3.5/5 |
| Value 30% | 77 $0.15 per continuous watt | 50 no current price (neutral score used) |
| Idle draw 15% | 67 1.5 A idle (about 18 W) with nothing plugged in | 33 2.5 A idle (about 30 W) with nothing plugged in |
| Safety listing 15% | 100 UL certified to UL 458 and CSA C22.2 No. 107.1-01 | 100 ETL listed to UL/cUL 458, CSA C22.2 No. 107.1-01; meets KKK-A-1822E |
| Warranty 15% | 0 1-year warranty | 50 3-year warranty |
| Features 15% | 95 remote included, app, transfer switch, hardwire terminal | 65 optional remote, app add-on, lithium charge profile, hardwire terminal |
| Efficiency 10% | 78 92% peak efficiency (maker rating) | 56 90% peak efficiency (maker rating) |
| Renogy PUH 3000W with Transfer Switch | Magnum Energy MS2812 | |
|---|---|---|
| Output | ||
| Type | Pure sine wave inverter | Pure sine wave inverter-charger |
| Continuous power | 3,000 W | 2,800 W |
| Surge power | 6,000 W for 2 s | 3,900 W for 5 s |
| DC input range | 11 to 15.5 V | 9 to 16.8 V |
| Idle draw | 1.5 A (18 W) | 2.5 A (30 W) |
| Power-saving draw | - | 0.7 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 | Yes |
| Charger | - | 125 A |
| Lithium charge profile | - | Yes |
| Parallel units | No | No |
| Control and build | ||
| Remote | Included | Optional extra |
| App | Built in | Optional add-on |
| Display | - | No |
| Safety listing | UL certified to UL 458 and CSA C22.2 No. 107.1-01 | ETL listed to UL/cUL 458, CSA C22.2 No. 107.1-01; meets KKK-A-1822E |
| Cooling | fan | fan |
| Dimensions | 19.2 x 10.4 x 3.8 in | 13.75 x 12.65 x 8.0 in (34.9 x 32.1 x 20.3 cm) |
| Weight | 14.8 lb | 55 lb |
| Warranty | 1 year | 3 years |
