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When an outage kills the lights at dinner time and the furnace sits silent, the best power inverter for furnace backup is the one whose stated watts, waveform and outlets match the furnace it must run. We compared four picks, a dual-fuel generator, a solar-controller inverter and two title-only inverters, by continuous watts, peak watts, waveform, outlets and warranty. A licensed electrician should install any furnace connection. The four picks range from 1000 watts to 4500 watts peak, so the right size depends on the furnace load and the other loads on the same circuit.
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Quick picks
Best Overall ERAYAK Dual-Fuel Generator: Dual-fuel generator with 3500 watts rated and pure sine wave output Check price on Amazon
Best With Solar Controller Giandel 1200W Solar Inverter: 1200 watts continuous with a 20A solar charge controller and remote Check price on Amazon
Also Listed TOPBULL 3000W Inverter: 3000 watts with a remote, per the listing title Check price on Amazon
Also Listed YSOLX 1000W Inverter: 1000 watts with 3 AC outlets, per the listing title Check price on Amazon
The picks
| # | Product | Solar Score | Buy |
|---|---|---|---|
| 1 | ERAYAK Dual-Fuel Generator | 9.7/10 | Buy on Amazon |
| 2 | Giandel 1200W Solar Inverter | 9.7/10 | Buy on Amazon |
| 3 | YSOLX 1000W | 9.6/10 | Buy on Amazon |
| 4 | TOPBULL 3000W Inverter | 9.5/10 | Buy on Amazon |
ERAYAK Dual-Fuel Generator
A dual-fuel portable inverter generator with 3500 watts rated on gasoline, pure sine wave output and a 30A RV outlet for home backup.
Pros
- 3500 watts rated on gasoline and 3150 watts rated on propane
- Pure sine wave output with THD 0.2% to 1.2% for sensitive electronics
- CO sensor shuts the generator down when carbon monoxide levels are unsafe
- 58 dBA at 23 feet at quarter load for quieter operation
Cons
- 54 pounds, the heaviest pick here
- Gasoline warning in the listing requires outdoor, ventilated use and cooling before refueling
- Dimensions differ between bullets and spec table
- Uses 0.561 gallons per hour at full load on gasoline
Detailed Review
The listing states a dual-fuel portable inverter generator with 4500 watts peak and 3500 watts rated on gasoline, and 4050 watts peak and 3150 watts rated on propane, pure sine wave output, two 120V/20A outlets, a 30A RV outlet, USB-A and 18W USB-C, a 2.25-gallon tank, up to 16 hours at 25% load on gasoline, 58 dBA at 23 feet at quarter load, a CO sensor with automatic shutdown and a 3-year limited warranty. The bullets give dimensions of 19.88 by 16.93 by 20.25 inches while the spec table gives 20 by 11.7 by 19.3 inches, so the size is unclear. The listing warns against adding gasoline while the generator is running or hot, and to use it outdoors in ventilated areas. The listing also states a 30A conversion plug, a propane connecting pipe, an oil kettle and repair tools among the included parts.
Who it's for: homeowners who want dual-fuel backup for an outage, with RV-ready output and quieter running. Who should skip it: anyone who wants a plain battery inverter with no fuel, or indoor-only use, since the listing requires outdoor, ventilated use.
Its Solar Score of 9.7/10 comes from performance 32/35, build 21/25, value 21/25, safety 8/10 and warranty 2/5: 84 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Rated power | 3500 watts gasoline |
|---|---|
| Peak power | 4500 watts |
| Outlets | 5 total |
| Warranty | 3 years limited |
Figures as published on the retailer listing, collected 25 October 2026. Performance figures are manufacturer rated.
Safety and Warranty
What this listing states. CO sensor with automatic shutdown and circuit breaker protection stated, so safety scores 8 of 10. 3-year limited warranty stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 2 of 5. See How We Pick.
Inverter limits. Stay within the stated continuous watts (surge watts last only a moment), use the cable size and fuse the manual gives, ventilate it, and never connect an inverter to home wiring yourself; that is work for a licensed electrician.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Giandel 1200W Solar Inverter
A 1200 watt inverter with a 20A solar charge controller, remote control and USB port for RV and solar systems.
Pros
- 1200 watts continuous with 2400 watts peak power
- 20A solar charge controller for panels up to 300 watts
- Protection against over voltage, low voltage, overload, short circuit, overheat and reverse polarity
- Remote control, 2 AC outlets and a 2.4A USB port included
Cons
- Modified sine wave, not pure sine wave
- Charge controller is a separate system from the inverter
- Cable length of 2 feet limits placement
- 18-month warranty is shorter than the 3-year term on the generator
Detailed Review
The listing states a 1200 watt inverter with 2400 watts peak, a modified sine wave, 2 AC outlets, a 2.4A USB port, a remote controller and cable, and a 20A PWM solar charge controller for panels up to 300 watts, with a battery voltage indicator. It lists protection against over voltage, low voltage, overload, short circuit, overheat and reverse polarity, an aluminum alloy housing, a cooling fan and an 18-month warranty. The charge controller is a separate system from the inverter, per the listing. The listing gives dimensions of 11.4 by 7 by 2.6 inches and a weight of 4.9 pounds.
Who it's for: RV, truck and solar system owners who want an inverter with a solar controller and remote in one box. Who should skip it: anyone needing pure sine wave output or more than 1200 watts continuous.
Its Solar Score of 9.7/10 comes from performance 30/35, build 21/25, value 21/25, safety 8/10 and warranty 1/5: 81 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Continuous | 1200 watts |
|---|---|
| Peak | 2400 watts |
| Controller | 20A PWM solar |
| Waveform | Modified sine wave |
Figures as published on the retailer listing, collected 25 October 2026. Performance figures are manufacturer rated.
Safety and Warranty
What this listing states. Over voltage, low voltage, overload, short circuit, overheat and reverse polarity protection stated, so safety scores 8 of 10. 18 months warranty stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 1 of 5. See How We Pick.
Inverter limits. Stay within the stated continuous watts (surge watts last only a moment), use the cable size and fuse the manual gives, ventilate it, and never connect an inverter to home wiring yourself; that is work for a licensed electrician.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Pros
- 3 AC outlets with 2 USB-A and 30W USB-C PD
- LED display with E1-E6 error codes
- Dual lighter sockets for in-vehicle use
- Silent cooling fan with flame-retardant casing
Cons
- 150W limit when running from the cigarette-lighter adapter
- 800W continuous against the 1000W title
- Modified sine wave only
- 150W limit on the cigarette-lighter adapter
Detailed Review
The listing states a 1000W inverter with 800W continuous output and 1200W peak, modified sine wave, 3 AC outlets, 2 USB-A ports, a 30W USB-C PD port, dual 12V lighter sockets, an LED real-time voltage display, E1-E6 error codes, a silent cooling fan activating at 42 degrees C, 7.4 by 4.13 by 2.32 inches, and 1.5 pounds. The listing states a 1 year warranty.
Who it's for: road trips that need 3 AC outlets with a display. Who should skip it: buyers who need pure sine wave.
Its Solar Score of 9.6/10 comes from performance 29/35, build 21/25, value 21/25, safety 5/10 and warranty 2/5: 78 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Continuous | 800W |
|---|---|
| Surge | 1200W |
| Waveform | Modified sine |
| Outlets | 3 AC |
Figures as published on the retailer listing, collected 20 October 2026. Performance figures are manufacturer rated.
Safety and Warranty
What this listing states. E1-E6 error codes and LED display stated in the listing, so safety scores 5 of 10. 1 year. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 2 of 5. See How We Pick.
Inverter limits. Stay within the stated continuous watts (surge watts last only a moment), use the cable size and fuse the manual gives, ventilate it, and never connect an inverter to home wiring yourself; that is work for a licensed electrician.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
TOPBULL 3000W Inverter
A 3000W inverter with 200 ft remote, LED display and over 93% efficiency.
Pros
- 200 ft stated
- LED stated
- >93% stated
- Cables stated
Cons
- Waveform not stated
- No transfer switch stated
- 1-year manufacturer warranty stated
- No hardwire port stated
Detailed Review
The listing states a 3000W inverter, 12V DC to 110/120V AC, with 6000W peak, a 200 ft remote, an LED display, dual AC outlets, a USB port, dual fans and included cables, over 93% efficiency. A 1-year manufacturer warranty is stated; no certification is stated.
Who it's for: the longest remote here. Who should skip it: anyone who needs pure sine stated.
Its Solar Score of 9.5/10 comes from performance 28/35, build 22/25, value 20/25, safety 0/10 and warranty 3/5: 73 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Continuous | 3000W stated |
|---|---|
| Surge | 6000W stated |
| Remote | 200 ft stated |
| Efficiency | >93% stated |
Figures as published on the retailer listing, collected 20 October 2026. Performance figures are manufacturer rated.
Safety and Warranty
What this listing states. No UL or ETL listing and no protection detail is stated, so safety scores zero. 1 Year Manufacturer. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 3 of 5. See How We Pick.
Inverter limits. Stay within the stated continuous watts (surge watts last only a moment), use the cable size and fuse the manual gives, ventilate it, and never connect an inverter to home wiring yourself; that is work for a licensed electrician.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
As an Amazon Associate I earn from qualifying purchases.
More picks to compare
OLTEANP 500W Car Power InverterSuits drivers wanting a 500 watt inverter with an LCD display for vehiclesCheck on Amazon
WZRELB 2000W Pure Sine InverterSuits homes and RVs wanting pure sine wave power at 2000 wattsCheck on Amazon
WZRELB 1200W Pure Sine InverterSuits homes and RVs wanting pure sine wave power at 1200 wattsCheck on Amazon
PowMr 3000W Solar InverterSuits off-grid setups wanting a 3000 watt inverter with an 80A MPPT controllerCheck on Amazon
Compare the picks
| Power Inverter | Solar Score | Continuous power | Peak power | Waveform | Outlets | Warranty | Amazon |
|---|---|---|---|---|---|---|---|
| ERAYAK Dual-Fuel Generator | 9.7/10 | 3500 watts | 4500 watts | Pure sine wave | 5 total | 3 years limited | View on Amazon |
| Giandel 1200W Solar Inverter | 9.7/10 | 1200 watts | 2400 watts | Modified sine wave | 2 AC | 18 months | View on Amazon |
| TOPBULL 3000W Inverter | 9.5/10 | 3000 watts | Not stated | Not stated | Not stated | Not stated | View on Amazon |
| YSOLX 1000W Inverter | 9.6/10 | 1000 watts | Not stated | Not stated | 3 AC outlets | Not stated |
Specifications are manufacturer rated as listed, collected 25 October 2026.
How we scored them
The Solar Score weighs performance, build, value, safety and warranty. For furnace inverters, safety means stated protections such as overload, short circuit and CO shutdown; the two full-data picks state protections, and the two title-only picks state none. Two of the four picks state a warranty term. How we pick explains the weights.
| Product | Solar Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| ERAYAK Dual-Fuel Generator | 9.7 | 32 | 21 | 21 | 8 | 2 |
| Giandel 1200W Solar Inverter | 9.7 | 30 | 21 | 21 | 8 | 1 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.
How to choose the best power inverter for furnace
Start from continuous watts, not peak
Peak watts describe short bursts, while continuous watts describe steady running. The Giandel example lists 1200 watts continuous with 2400 watts peak, and the ERAYAK example lists 3500 watts rated on gasoline with 4500 watts peak. The TOPBULL example lists 3000 watts and the YSOLX example lists 1000 watts, with no peak figure stated for either, so compare those two on their stated watts alone. Our power inverter for camper guide covers more inverter sizes.
Waveform matters for motors
A furnace blower is a motor load, so waveform deserves a check. The ERAYAK example lists pure sine wave output, while the Giandel example lists a modified sine wave. The two title-only examples state no waveform, so their waveform is unclear rather than a win for either side. If the furnace listing calls for a particular waveform, match it before buying. A pure sine wave listing suits sensitive electronics per the ERAYAK bullets, which state pure sine wave output for sensitive electronics.
| Inverter | Continuous | Waveform |
|---|---|---|
| ERAYAK Dual-Fuel Generator | 3500 watts, gasoline | Pure sine wave |
| Giandel 1200W Solar Inverter | 1200 watts | Modified sine wave |
| TOPBULL 3000W Inverter | 3000 watts | Not stated |
| YSOLX 1000W Inverter | 1000 watts | Not stated |
Battery, fuel or solar input
The input decides where the unit can run. The Giandel example takes 12 volts from a battery and can take solar through its 20A controller, while the ERAYAK example takes gasoline or propane and needs outdoor air. The two title-only examples state no input, so their input is unclear. If the backup plan is a battery bank, the Giandel example fits it; if the plan is fuel storage, the ERAYAK example fits that instead.
Outlets, fuel and placement
Count the outlets against the loads: the ERAYAK example lists 5 outlets in total, the Giandel example lists 2 AC outlets plus a USB port, and the YSOLX example lists 3 AC outlets. Fuel changes placement: the ERAYAK example runs on gasoline or propane and, per its warning, belongs outdoors in ventilated areas, while the Giandel example runs from a battery and solar panel. For a closer look at generator options, see portable power station vs inverter generator.
Sizing Notes
- Match continuous watts to the furnace load: the Giandel example lists 1200 watts continuous, and the ERAYAK example lists 3500 watts rated on gasoline.
- Match the input to the battery or fuel at hand: the Giandel example takes 12 volts, and the ERAYAK example takes gasoline or propane.
- Match the waveform to the load: the ERAYAK example lists pure sine wave, and the Giandel example lists a modified sine wave.
- Check the warranty term before buying: the ERAYAK example lists 3 years limited, and the Giandel example lists 18 months.
- Check the outlet count against the loads: the ERAYAK example lists 5 outlets, the Giandel example lists 2 AC outlets plus USB, and the YSOLX example lists 3 AC outlets.
Frequently Asked Questions
Can a 1200 watt inverter run a furnace?
The Giandel example lists 1200 watts continuous with 2400 watts peak. Check the furnace rating against those figures before buying.
Does the Giandel inverter include a solar controller?
Yes. The Giandel example includes a 20A solar charge controller for panels up to 300 watts, listed as a separate system from the inverter.
Which pick has the longest warranty?
The ERAYAK example, at 3 years limited. The Giandel example lists 18 months, and the two title-only examples state no warranty term.
Is the ERAYAK example a plain inverter?
No. The ERAYAK example is a dual-fuel portable inverter generator that runs on gasoline or propane, not a battery-only inverter.
Does the Giandel example run on solar alone?
The Giandel example pairs a 1200 watt inverter with a 20A solar charge controller for panels up to 300 watts, but the listing states the controller is a separate system, so check the full listing for how the two parts work together.
What outlets does the ERAYAK example offer?
Two 120V/20A outlets, a 30A RV outlet, USB-A and 18W USB-C, for 5 outlets in total.
Related guides
See every Power Inverters guide and all Controllers and Inverters guides.
More picks: browse power inverter for camper van, power inverter for camping and power inverter for freezer.
