Running Watts vs Starting Watts: Appliance Chart

Running watts are what an appliance draws once it’s going. Starting watts are the brief spike a motor or compressor needs to get moving, often two to three times higher. A power station has to clear both: its continuous rating covers running watts, and its surge rating covers the start. Miss the second and the inverter shuts off before the motor turns.

Below is a sourced surge chart for every motor load in our appliance wattage table, plus how many of the 39 power stations we track can start each one.

What are running and starting watts?

An induction motor at rest has no back-pressure from its own spinning. In the first moments after you switch it on, it pulls far more current than it will once it’s up to speed. Compressors are the same, made worse if they have to start against refrigerant pressure. That spike lasts a fraction of a second to a second or two, then settles to the running draw.

Resistive loads behave differently. A heater, toaster or incandescent bulb draws its rated power from the instant it switches on and never more. Electronics like laptops and routers draw through a power supply that doesn’t surge in any way that matters to a power station.

So the question “how many watts does it need?” has two answers for motors and one for everything else.

Load type	Examples	Running watts	Starting watts
Resistive	Space heater, toaster, coffee maker, electric grill	Rated draw	Same as running
Electronics	Laptop, router, TV, phone charger	Rated draw	Same as running, for sizing purposes
Motor or compressor	Fridge, pump, AC, air compressor, saws	Rated draw	1.3x to 3x+ running

Which appliances have big startup surges?

The worst offenders share one trait: they start a motor under load. A sump pump starts against a column of water. A well pump starts against pressure in the line. A garage door opener starts against the weight of the door. An air compressor starts against a tank that may already be pressurized.

DTE Energy’s GenerLink appliance guide assigns a “starting factor” of 3 to submersible sump pumps, well pumps and garage door openers, meaning start-up takes three times running watts. Lighter-duty motors such as drills and saws start closer to 1.5x to 2x.

Surge figures for common appliances

Every motor load in our database with a published start-up figure, sorted by surge multiple. The last column counts how many of the 39 currently sold stations we track can both run and start it, using each station’s published continuous and surge ratings.

Appliance	Running W	Starting W	Multiple	Stations that can start it	Source
Refrigerator (generator-sizing value)	700	2,200	3.1x	29	Champion
Submersible sump pump, 1/2 HP	1,000	3,000	3.0x	25	DTE
Well pump, 1/3 HP	750	2,250	3.0x	29	DTE
Garage door opener, 1/2 HP	1,050	3,150	3.0x	22	DTE
Air compressor, 1 HP	1,600	4,500	2.8x	10	Champion
Electric hedge trimmer	450	1,200	2.7x	33	Champion
Electric lawn edger	950	2,400	2.5x	29	Champion
Electric string trimmer	350	875	2.5x	35	Champion
Blender (standard)	300	650	2.2x	36	Champion
Well pump, typical	1,000	2,100	2.1x	29	Champion
Belt sander	1,200	2,400	2.0x	29	Champion
Hand sander	600	1,200	2.0x	33	Champion
Electric chainsaw	1,200	2,400	2.0x	29	Champion
Electric lawn mower	1,200	2,400	2.0x	29	Champion
Electric pressure washer	1,200	2,400	2.0x	29	Champion
RV rooftop AC, 15,000 BTU	1,800	3,500	1.9x	22	Micro-Air
RV rooftop AC, 13,500 BTU	1,500	2,800	1.9x	25	Micro-Air
Furnace blower, 1/4 HP	600	1,000	1.7x	34	Champion
Circular saw	1,200	2,000	1.7x	29	Champion
Sump pump, 1/3 HP	800	1,300	1.6x	31	Champion
Window AC, 13,000 BTU	1,800	2,800	1.6x	24	Champion
Corded drill	600	900	1.5x	34	Champion
Central AC, 3-ton	5,400	7,200	1.3x	2	Champion

Champion figures come from its wattage reference chart and RV AC figures from Micro-Air. Two more tools in our database, the reciprocating saw (1,440 W) and 10-inch table saw (1,800 W), are flagged by their source as needing extra wattage at start-up without a published figure, so plan on a margin above their running draw.

Does your power station’s surge rating hold up?

Surge ratings vary far more than continuous ratings, and the ratio between them tells you how much motor-starting headroom a station has:

Station	Continuous	Surge	Surge headroom
EcoFlow RIVER 3	300 W	600 W	2.0x
Anker SOLIX C800 Plus	1,200 W	1,600 W	1.3x
Anker SOLIX C1000	1,800 W	2,400 W	1.3x
EcoFlow DELTA 3 Plus	1,800 W	3,600 W	2.0x
OUPES Mega 1	2,000 W	4,500 W	2.3x
Anker SOLIX F3800	6,000 W	9,000 W	1.5x
Jackery Explorer 5000 Plus	7,200 W	14,400 W	2.0x

The C1000 and DELTA 3 Plus have the same 1,800 W continuous rating, but the DELTA’s 3,600 W surge starts a 1/2 HP sump pump and the C1000’s 2,400 W doesn’t, as our sump pump runtime data shows. That’s the kind of difference a “1,800 W” headline hides. The OUPES Mega 1’s 4,500 W surge is the only figure among 1kWh-class stations that matches a 1 HP air compressor’s start.

Three cautions when reading surge specs:

• Some stations don’t publish one. Eight of the 39 we track list no surge figure, including the BLUETTI Elite 200 V2. Our tools treat a blank as equal to the continuous rating, because that’s the only figure the maker stands behind.
• Duration is rarely stated. A surge rating covers a brief peak. Makers seldom say for how long, which is why we compare the figure only against start-up spikes, never against a sustained load.
• Boost modes aren’t surge. Features like EcoFlow’s X-Boost or BLUETTI’s Power Lifting run resistive loads above the inverter rating by lowering voltage. They help a kettle; they don’t start a compressor.

Several appliances at once

When several loads share a station, add up all the running watts, then add the single largest extra surge (starting minus running). Two motors rarely start at the exact same instant, so you only need headroom for one spike at a time. Our runtime calculator uses exactly this rule.

Worked example, for an outage running a fridge (generator-sizing value), a 1/2 HP sump pump, four LED bulbs and a router:

Load	Running W	Extra at start
Refrigerator	700	1,500
Sump pump, 1/2 HP	1,000	2,000
4 LED bulbs	36	0
Wi-Fi router	6.5	0
Total	1,742.5	largest: 2,000

Peak = 1,742.5 + 2,000 = 3,742.5 W. The DELTA 3 Plus covers the running load (1,800 W) but its 3,600 W surge falls just short of that peak. The PECRON E1500LFP at 2,200 W continuous and 4,400 W surge handles both.

Why generator charts and real appliances disagree

Most published starting-watt figures come from generator makers and utilities, and they’re written to make sure nobody buys a generator that’s too small. That bias toward caution shows up clearly in our database.

Take the refrigerator. Champion’s chart lists 700 running watts and 2,200 starting watts. EWEB’s typical figures put an ENERGY STAR full-size fridge at about 160 W running, cycling about a third of the time. Both are “right” for their purpose: Champion’s number keeps a generator from stalling on the worst fridge you might own, and EWEB’s tells you what a typical modern one actually draws.

For a power station, use them differently:

• For the start-up check, the conservative chart figure is a sensible safety margin. If your station clears it, it will start almost any appliance of that type.
• For runtime, use the measured or typical running figure. Plugging 700 W into a runtime formula makes a 1kWh station look good for about 1.2 hours on a fridge, when the realistic answer is about 17.
• When the two conflict, your appliance’s own label beats both. Look for running amps (multiply by about 115 V) and, on compressors, locked-rotor amps (LRA), which describes the start-up current.

What happens when a station can’t start a motor?

The failure is usually obvious and harmless. The appliance hums or clicks, the station’s display shows an overload warning, and the AC output shuts off. Most stations recover once you unplug the load and reset the output.

If it happens, work through these checks:

1. Unplug everything else. Other running loads eat into surge headroom. A fridge that won’t start alongside a microwave may start fine on its own.
2. Compare the label to the surge rating. If the appliance’s starting figure is above the station’s published surge, no setting will fix it.
3. Check for a boost mode. Voltage-lowering modes help resistive loads but can make motor starting worse. Turn them off for compressors and pumps.
4. Try again after a pause. A compressor that has just stopped may be trying to restart against high refrigerant pressure. Give it a few minutes to equalize and it often starts more easily.
5. Consider a soft starter or a bigger station. If a load trips the inverter every time, the fix is hardware, not settings.

Soft starters and inverter appliances

If a motor load won’t start on your station, you have three options short of a bigger station.

Soft starters. These add-on modules ramp a compressor’s current up over a second or so instead of letting it slam on. Micro-Air, which sells them, says a soft starter can cut an RV air conditioner’s start-up surge by as much as 70%. Treat that as a best case, but even half that would bring a 2,800 W start inside a 2,400 W surge rating.

Inverter (variable-speed) appliances. Our window AC runtime data shows how much this matters for cooling. Inverter air conditioners, refrigerators and heat pumps drive their compressors through electronics that ramp speed gradually, so they barely surge. They also slow down rather than cycling fully off and on. Our database shows the effect on furnace fans: a variable-speed blower runs at about 200 W, while a conventional 1/4 HP blower needs 600 W running and 1,000 W to start.

Staggering loads. If two motors might start together, such as a fridge and a well pump, switch one off while the other starts. It keeps your peak to one spike, which is what the math above assumes anyway.

How to size a station using both numbers

1. List every load with its running watts and, for motors, its starting watts. Our full power station sizing guide walks through this with worked examples.
2. Add the running watts of everything you’ll use at once. Your station’s continuous rating must exceed that.
3. Add the largest extra start-up surge. Your station’s published surge rating must exceed that.
4. Then check capacity for runtime: usable Wh (85% of rated) divided by average draw.

Our power station rankings list continuous and surge output for every model, and the runtime calculator runs steps 2 to 4 for you, flagging any load whose start-up exceeds the station’s surge rating. Our how we evaluate page explains how output figures into each score.