PRODUCT DETAILS
The Go Power! ASW-1200-12-TS is a UL Listed 1200-watt, 12-volt pure sine wave inverter with a built-in 30-amp automatic transfer switch, for RVs and boats. Plugged into shore power or a generator, it passes AC straight through to your outlets; unplug, and within 20 milliseconds it switches to inverting clean 120V AC (<3% THD) from the battery bank, with 2400W of surge for motor start-up. It is PowerTrak™ compatible, UL Listed to UL 458, and covered by a 2-year warranty with a North American support team.
One wiring job, every outlet live
Because the transfer switch is inside the inverter, you hardwire it once between the shore inlet and the AC panel and never think about it again: the microwave, TV and outlets work the same whether you are at a campground or boondocking. The switch is rated for 30A continuous pass-through and protected by a 30A auto-resetting breaker.
Built to the standard RV manufacturers install
Go Power! has designed mobile power since 1996 and is the inverter brand fitted at the factory by Jayco, Forest River, Thor and other leading RV builders. The ASW series is UL Listed to UL 458, the safety standard written for inverters in vehicles and boats, with input over/under-voltage, reverse-polarity, over-current, short-circuit and overload protection, and FCC Class B emissions compliance. Part of Dometic.
Clean power, efficiently
Pure sine wave output under 3% THD keeps sensitive electronics, motors and medical devices running cool and quiet, and 91% peak efficiency means more of your battery reaches the appliance. A power-saving mode drops standby draw below 0.1A. Add the optional remote switch or the PowerTrak™ display to turn the inverter on and off from the galley.
Part of a system
PowerTrak™ compatibility puts the inverter on the same RV-C network as Go Power! Advanced Lithium Batteries, the Battery Manager Kit and Dometic MPPT solar controllers, so you can monitor load, state of charge and solar input from one screen and adjust the low-voltage cut-off to suit your battery chemistry (programmable 10.0–11.5V).
Which size?
1200W is the compact choice for vans, truck campers and small trailers where the inverter mainly covers a coffee maker, TV, laptops and a CPAP, and you want the transfer switch so nothing needs re-plugging when you leave shore power. Running a microwave regularly? Step up to the ASW-1800-12-TS.
FEATURES
- 1200W continuous, 2400W surge — with up to 60 seconds of overload tolerance for hard-starting loads.
- Built-in 30A automatic transfer switch, ≤20 ms — shore and generator power pass straight through; inverter takes over the instant AC drops.
- True pure sine wave, <3% THD — safe for CPAPs, laptops, induction cooktops, audio/video and anything with a motor or charger.
- UL Listed to UL 458 / FCC Class B — the mobile-inverter safety standard RV manufacturers and marine surveyors look for.
- PowerTrak™ / RV-C compatible — monitor and control from the PowerTrak™ display alongside Go Power! lithium batteries and Dometic MPPT controllers.
- 91% peak efficiency, <0.1A in power-saving mode — longer runtime from the same battery bank.
- Programmable low-voltage cut-off (10.0–11.5V) — tune it for lithium or lead-acid.
- Hardwire AC in and out — push-in L/N/G terminal blocks with strain relief; 10 AWG wiring on a 30A breaker.
- Full protection suite — input over/under-voltage, reverse polarity, over-current; output short-circuit and overload.
- Remote-ready — works with the optional remote switch or PowerTrak™ display (sold separately).
- 2-year warranty + North American support from Go Power!, part of Dometic.
WHAT IT RUNS
Approximate runtime from a single Go Power! 100Ah Advanced Lithium battery (≈1,280Wh, 90% inverter efficiency). Double it for a 200Ah bank. Add up everything you'll run at the same time and stay under 1200W. On shore power the transfer switch passes through up to 30A, so these limits apply only when inverting.
| Appliance | Typical draw | Runtime on 100Ah lithium |
|---|---|---|
| RV microwave (700–1000W) | 1000W | ≈ 1 hr (6–10 meals) |
| Drip coffee maker | 900W | ≈ 1 hr 15 min (≈ 8 pots) |
| 12 cu ft residential fridge | 150W avg (600W start) | ≈ 7–8 hrs |
| CPAP (no humidifier) | 40W | ≈ 28 hrs |
| 32" TV + streaming box | 80W | ≈ 14 hrs |
| Laptop charger | 65W | ≈ 17 hrs |
| Blender | 1200W | ≈ 55 min |
| Hair dryer (low) | 1200W | ≈ 55 min |
Not recommended: rooftop RV air conditioners, 1500W induction cooktops or space heaters at full power, electric water heater elements.
SPECIFICATIONS
- Length:
- Width:
- Height:
- Weight:
| Model / SKU | ASW-1200-12-TS / 83826 |
|---|---|
| Rated Power | 1200 W |
| Nominal Voltage | 12.5 VDC |
| Input Voltage Range | 10 ~ 16.5 VDC |
| Surge Rating (Max) | 133 A |
| No Load Current | ≤1.8 A @ 12.5VDC |
| Peak Power (3 sec) | 1441–2400W |
| Output Voltage | 120 Vac ±3% |
| Frequency | 50/60 Hz ± 0.3 Hz (selectable) |
| Output Waveform | Pure Sine Wave |
| THD | <3% |
| Max. Efficiency | 91% |
| Transfer Relay Rating | 30A continuous |
| Transfer Time | ≤20ms |
| Operating Temp (Full Load) | -20°C ~ 40°C (-4°F ~ 104°F) |
| Dimensions (W×H×D) | 8.94 × 3.39 × 13.62 in |
| Net Weight | 7.50 lb (3.4 kg) |
| Safety Standards | UL458 |
| EMC Standards | FCC Class B |
| Low-Voltage Warning / Shutdown / Recovery | 11.0 V / 10.0 V (programmable 10.0–11.5 V) / 12.5 V |
| AC Connections | Hardwire input and output terminal blocks (L / N / G, push-in cage clamps) |
| AC Input Wiring | 10 AWG on a 30 A breaker |
| Recommended DC Cable / Fuse | #2 AWG, 200A Class T, max 10 ft per cable |
| Certification | UL Listed (UL 458), FCC Class B |
| Warranty | 2 years |
COMPARE MODELS
| Model | Continuous / surge | Install | Transfer switch | Battery charger | Warranty | Best for |
|---|---|---|---|---|---|---|
| SSW-2000-12 | 2000W / 4000W | GFCI outlets | — | — | 2 yr | Most RVs: microwave, induction, residential fridge |
| ASW-1200-12-TS (this model) | 1200W / 2400W | Hardwire | 30A built-in | — | 2 yr | Compact shore-to-battery switching |
| ASW-1800-12-TS | 1800W / 3600W | Hardwire | 30A built-in | — | 2 yr | Automatic shore-to-battery switching |
| ASW-3000-12-TS | 3000W / 6000W | Hardwire | 30A built-in | — | 2 yr | Whole-coach transfer switching, large loads |
| AIC-2000-12-SL | 2000W / 4000W | Hardwire | 30A built-in | 100A | 3 yr | All-in-one: inverter + charger + transfer switch |
MANUALS, SAFETY INFORMATION AND DOWNLOADS
FAQ
What does the built-in transfer switch do?
It automatically chooses the power source. When shore or generator power is present, the inverter passes it straight through to your outlets (up to 30A) and stays idle. When that AC drops, the switch flips to the inverter in 20 milliseconds or less, so the TV, microwave and outlets keep working from the batteries without re-plugging anything.
Does the ASW charge my batteries from shore power?
No. The ASW passes shore power through and inverts from the battery, but it does not include a charger — keep your converter or add a separate charger. If you want inverter, charger and transfer switch in one unit, see the AIC-2000-12-SL Advanced Inverter Charger.
How is the ASW installed?
It is hardwired: shore/generator AC comes into the input terminal block, the output terminal block feeds your AC panel or inverter sub-panel, and 12V DC comes from the battery through a Class T fuse. Because this involves 120V AC wiring, follow the manual and local code, and have an RV technician or electrician do the AC side if you are not comfortable inside a breaker panel.
What can a 1200-watt inverter run in an RV?
A 1200W pure sine wave inverter runs any single RV appliance up to 1200W — coffee maker, blender, TV, laptops, CPAP, a compact microwave and a residential fridge — one high-draw item at a time. It will not run a rooftop air conditioner without a soft-start. Add up the wattage of everything you'll use simultaneously and stay under 1200W.
What size battery bank do I need for a 1200W inverter?
At full load a 1200W inverter draws about 110A from a 12V bank, so plan on at least 100–200Ah of lithium for sustained use (Go Power! 100Ah or 300Ah Advanced Lithium batteries), or less for short high-draw tasks like a few minutes of microwave. Lead-acid banks should be twice that size because they only deliver about 50% of rated capacity.
What cable and fuse size does the ASW-1200-12-TS need?
#2 AWG copper cable, a 200A Class T fuse or breaker on the positive lead, and no more than 10 ft (3 m) per DC cable. The Go Power! Inverter Install Kit (1100–1800W) includes correctly sized cables, fuse block and lugs.
Is this inverter compatible with lithium (LiFePO4) batteries?
Yes. The 10–16.5V input range covers LiFePO4, AGM and flooded 12V banks. With Go Power! Advanced Lithium Batteries it also shares state of charge and low-voltage protection over the RV-C network through PowerTrak™.
What is the difference between pure sine wave and modified sine wave?
Pure sine wave output is identical to household AC, so sensitive electronics, motors, chargers and medical devices run cool and quiet. Modified sine wave is a stepped approximation that can cause buzzing, overheating and shortened life in anything with a motor, microwave magnetron or switching power supply. For a modern RV, pure sine wave is the safe choice.
Can I use this inverter in a 24V system?
No. The ASW-1200-12-TS is a 12V unit. For 24V systems see the Go Power! 24V industrial pure sine wave inverters.
What does UL Listed to UL 458 mean?
UL 458 is the safety standard specifically for power inverters and chargers used in land vehicles and marine craft. A UL Listing means the ASW-1200-12-TS was tested by UL to that standard, which is what RV manufacturers, marine surveyors and many insurers require.
Is Go Power! the inverter installed in my RV from the factory?
Very likely, if your coach is a Jayco, Forest River, Thor or many other brands. Go Power! has supplied RV manufacturers since 1996, and the ASW series is the current generation of that OEM line, so it's a drop-in upgrade path with matching remotes and PowerTrak™ components.
Does it include a remote?
The remote switch is sold separately so you only pay for it if you need it. If you have a PowerTrak™ display, you can turn the inverter on and off and change settings from the display instead.
What's the warranty and who do I call for support?
Two years, backed by Go Power!'s North American support team (part of Dometic). Register your product after purchase; support is available by phone and email, and manuals and quick-start guides are linked above.