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What can my generator run? / 3,500 W

What can a 3,500 W generator run?

The 3,000–3,500 W class is the most common first home backup generator: enough for the fridge, a sump pump and a furnace fan, but not much more at the same time. On its own it can start 64 of the 86 appliances we track. Big ones it can’t: well pump 1 HP, electric range, dishwasher, central air conditioner 2 ton, central air conditioner 3 ton.

Common appliances, one at a time

Assumes 3,500 W is the generator’s starting (peak) rating and about 2,800 W is its running rating. Across the 11 generators we track, running watts are typically 80% of starting watts. Enter your generator’s real numbers in the planner below.

ApplianceRunningStartingOn a 3,500 W generator
Refrigerator (full-size) 400 W 1,200 W Comfortable
Rated 2,800 W covers your 1,200 W peak plus 20%.
Freezer (chest or upright) 500 W 1,000 W Comfortable
Rated 2,800 W covers your 1,000 W peak plus 20%.
Sump pump 1/2 HP 1,050 W 2,150 W Comfortable
Rated 2,800 W covers your 2,150 W peak plus 20%.
Well pump 1/2 HP 1,000 W 2,000 W Comfortable
Rated 2,800 W covers your 2,000 W peak plus 20%. Your well pump may need 240V: check its nameplate.
Well pump 1 HP 2,000 W 4,000 W No 240V outlet
Your well pump needs 240V, and this generator has 120V outlets only.
Furnace fan 1/2 HP (gas or oil) 875 W 2,350 W Works, little headroom
Covers your 2,350 W peak, but is under the 2,820 W target.
Window air conditioner 10000 BTU 1,500 W 2,400 W Works, little headroom
Covers your 2,400 W peak, but is under the 2,880 W target.
Central air conditioner 2 ton 2,500 W 4,500 W No 240V outlet
Your central air conditioner needs 240V, and this generator has 120V outlets only.
Microwave oven 1,500 W 1,500 W Comfortable
Rated 2,800 W covers your 1,500 W peak plus 20%.
Electric space heater 1,500 W 1,500 W Comfortable
Rated 2,800 W covers your 1,500 W peak plus 20%.
Electric water heater 4,500 W 4,500 W No 240V outlet
Your electric water heater needs 240V, and this generator has 120V outlets only.
Electric clothes dryer 6,000 W 6,750 W No 240V outlet
Your electric clothes dryer needs 240V, and this generator has 120V outlets only.
RV air conditioner 13500 BTU 2,000 W 3,500 W Works, little headroom
Covers your 3,500 W peak, but is under the 4,200 W target.
Air compressor 1 HP 1,600 W 4,500 W Won’t start the air compressor
Starting output of 3,500 W is below your 4,500 W peak.

Common setups, all at once

SetupRunningPeakVerdict
Outage essentials
Fridge, sump pump, furnace fan, five lights and the Wi-Fi router.		 2,245 W 3,345 W Works, little headroom
Covers your 3,345 W peak, but is under the 4,014 W target.
Fridge + freezer
Keep food cold: a full-size fridge and a chest or upright freezer.		 900 W 1,700 W Comfortable
Rated 2,800 W covers your 1,700 W peak plus 20%.
CPAP night
A CPAP with heated humidifier for an 8-hour night, plus one light.		 135 W 135 W Comfortable
Rated 2,800 W covers your 135 W peak plus 20%.
Keep the heat on
A gas or oil furnace needs power for its fan. Plus the fridge, lights and router.		 1,180 W 1,980 W Comfortable
Rated 2,800 W covers your 1,980 W peak plus 20%.
RV 30 A
A 13,500 BTU roof AC, the RV fridge, microwave and lights.		 4,000 W 5,500 W Too small
Your running load plus 20% needs 4,800 W; this is rated 2,800 W.
Work tools
A circular saw, a 1 HP compressor and a work light, all running at once (the worst case).		 3,425 W 6,325 W Too small
Your running load plus 20% needs 4,110 W; this is rated 2,800 W.

Models in this class that we track: Honda EU3000iS (2,800/3,000 W); Generac GP3500iO (3,000/3,500 W).

Check your own list

The My unit tab is preloaded with a 3,500 W generator. Change its watts to match your nameplate, then add or remove appliances.

Start with a common setup

Pick the closest match, then fine-tune the list below.

Fridge, sump pump, furnace fan, five lights and the Wi-Fi router. Change anything below.

Your appliances

9 items · adjust quantities or edit watts

  • Refrigerator (full-size)

    400 W running · 1,200 W starting

    1
    Motor start surge

  • Sump pump 1/2 HP

    1,050 W running · 2,150 W starting

    1
    Motor start surge

  • Furnace fan 1/3 HP (gas or oil)

    700 W running · 1,400 W starting

    1
    Motor start surge

  • LED bulb (each)

    15 W running · 15 W starting

    5

  • Wi-Fi router or modem

    20 W running · 20 W starting

    1

Add appliances

86 household appliances, tools and RV loads

Essentials2 added8

  • Refrigerator (full-size)

    400 W running · 1,200 W starting

    1
    HON · highMotor start surge

  • Freezer (chest or upright)

    500 W running · 1,000 W starting

    CHA · mediumMotor start surge

  • Mini fridge or cooler

    100 W running · 600 W starting

    CHA · mediumMotor start surge

  • Sump pump 1/3 HP

    800 W running · 1,600 W starting

    CHA · highMotor start surge

  • Sump pump 1/2 HP

    1,050 W running · 2,150 W starting

    1
    CHA · highMotor start surge

  • Well pump 1/2 HP

    1,000 W running · 2,000 W starting

    CHA · mediumMotor start surgeMay need 240V

  • Well pump 1 HP

    2,000 W running · 4,000 W starting

    CHA · mediumMotor start surgeNeeds 240V

  • Electric water heater

    4,500 W running · 4,500 W starting

    HON · highNeeds 240V
Heating and cooling1 added14

  • Furnace fan 1/8 HP (gas or oil)

    300 W running · 500 W starting

    HON · highMotor start surge

  • Furnace fan 1/6 HP (gas or oil)

    500 W running · 750 W starting

    HON · highMotor start surge

  • Furnace fan 1/4 HP (gas or oil)

    600 W running · 1,000 W starting

    HON · highMotor start surge

  • Furnace fan 1/3 HP (gas or oil)

    700 W running · 1,400 W starting

    1
    HON · highMotor start surge

  • Furnace fan 1/2 HP (gas or oil)

    875 W running · 2,350 W starting

    HON · highMotor start surge

  • Window air conditioner 5000 BTU

    600 W running · 1,200 W starting

    CHA · mediumMotor start surge

  • Window air conditioner 10000 BTU

    1,500 W running · 2,400 W starting

    HON · highMotor start surge

  • Central air conditioner 2 ton

    2,500 W running · 4,500 W starting

    CHA · mediumMotor start surgeNeeds 240V

  • Central air conditioner 3 ton

    3,500 W running · 6,000 W starting

    CHA · mediumMotor start surgeNeeds 240V

  • Central air conditioner 4 ton

    5,000 W running · 8,000 W starting

    CHA · mediumMotor start surgeNeeds 240V

  • Electric space heater

    1,500 W running · 1,500 W starting

    CHA · high

  • Radiant heater

    1,300 W running · 1,300 W starting

    HON · high

  • Ceiling fan

    75 W running · 75 W starting

    CHA · high

  • Box or window fan

    200 W running · 200 W starting

    CHA · mediumMotor start surge
Kitchen13

  • Microwave oven

    1,500 W running · 1,500 W starting

    CHA · high

  • Coffee maker

    1,200 W running · 1,200 W starting

    HON · medium

  • Toaster

    1,200 W running · 1,200 W starting

    GEN · medium

  • Electric range (one burner)

    2,400 W running · 2,400 W starting

    CHA · highMay need 240V

  • Electric fry pan

    1,500 W running · 1,500 W starting

    HON · high

  • Electric grill (tabletop)

    1,650 W running · 1,650 W starting

    CHA · high

  • Slow cooker

    270 W running · 270 W starting

    HON · high

  • Blender

    600 W running · 1,200 W starting

    HON · mediumMotor start surge

  • Air fryer

    1,500 W running · 1,500 W starting

    CHAPDF · lowCheck your nameplate

  • Portable induction cooktop

    1,800 W running · 1,800 W starting

    CHA · medium

  • Electric smoker

    1,200 W running · 1,200 W starting

    CHA · medium

  • Dishwasher (cool dry cycle)

    216 W running · 540 W starting

    HON · mediumMotor start surge

  • Dishwasher (heated dry)

    2,400 W running · 2,400 W starting

    CHA · medium
Laundry3

  • Washing machine

    1,200 W running · 2,300 W starting

    HON · highMotor start surge

  • Electric clothes dryer

    6,000 W running · 6,750 W starting

    HON · highMotor start surgeNeeds 240V

  • Gas clothes dryer

    700 W running · 2,200 W starting

    SMH · lowMotor start surgeCheck your nameplate
Electronics1 added9

  • TV (flat screen 20 to 55 inch)

    400 W running · 400 W starting

    CHA · high

  • Desktop computer

    800 W running · 800 W starting

    HON · medium

  • Laptop or phone charger

    250 W running · 250 W starting

    CHA · medium

  • LCD monitor

    30 W running · 30 W starting

    HON · high

  • Printer

    600 W running · 600 W starting

    HON · medium

  • Wi-Fi router or modem

    20 W running · 20 W starting

    1
    CHA · high

  • Satellite receiver

    250 W running · 250 W starting

    HON · medium

  • Radio

    200 W running · 200 W starting

    HON · high

  • Home security system

    40 W running · 40 W starting

    CHA · high
Lighting5 added1

  • LED bulb (each)

    15 W running · 15 W starting

    5
    CHA · high
Medical2

  • CPAP machine (no heated humidifier)

    60 W running · 60 W starting

    CHA · medium

  • CPAP machine (heated humidifier)

    120 W running · 120 W starting

    CHA · medium
RV and outdoor8

  • RV air conditioner 11000 BTU

    1,010 W running · 1,600 W starting

    HON · highMotor start surge

  • RV air conditioner 13500 BTU

    2,000 W running · 3,500 W starting

    HON · highMotor start surge

  • RV air conditioner 15000 BTU

    2,500 W running · 4,500 W starting

    HON · highMotor start surge

  • RV refrigerator

    600 W running · 1,000 W starting

    HON · mediumMotor start surge

  • RV microwave

    1,200 W running · 1,200 W starting

    CHA · medium

  • RV water heater (electric)

    1,500 W running · 1,500 W starting

    CHA · medium

  • String or LED camp lights

    200 W running · 200 W starting

    CHA · medium

  • Portable projector

    300 W running · 300 W starting

    CHA · medium
Garage and tools21

  • Garage door opener

    720 W running · 1,420 W starting

    HON · highMotor start surge

  • Circular saw (7-1/4 in)

    1,800 W running · 3,600 W starting

    CHA · highMotor start surge

  • Table saw (10 in)

    3,000 W running · 6,000 W starting

    CHA · highMotor start surge

  • Miter saw (10 in)

    1,800 W running · 3,600 W starting

    CHA · mediumMotor start surge

  • Reciprocating saw

    1,200 W running · 2,400 W starting

    CHA · mediumMotor start surge

  • Angle grinder (4-1/2 in)

    1,800 W running · 3,600 W starting

    CHA · mediumMotor start surge

  • Electric drill (1/2 in)

    600 W running · 1,200 W starting

    CHA · highMotor start surge

  • Hammer drill

    1,200 W running · 2,400 W starting

    CHA · mediumMotor start surge

  • Belt sander

    1,200 W running · 2,400 W starting

    CHA · mediumMotor start surge

  • Air compressor 1/2 HP

    975 W running · 1,600 W starting

    HON · highMotor start surge

  • Air compressor 1 HP

    1,600 W running · 4,500 W starting

    CHA · highMotor start surge

  • Air compressor 2 HP

    2,500 W running · 7,500 W starting

    CHA · mediumMotor start surgeNeeds 240V

  • Air compressor 3 HP

    3,500 W running · 10,500 W starting

    CHA · mediumMotor start surgeNeeds 240V

  • Pressure washer 1500 PSI

    1,500 W running · 3,000 W starting

    CHA · mediumMotor start surge

  • Pressure washer 2500 PSI

    2,500 W running · 5,000 W starting

    CHA · mediumMotor start surge

  • Welder (120V)

    2,500 W running · 5,000 W starting

    CHA · mediumMotor start surge

  • Welder (240V)

    8,000 W running · 16,000 W starting

    CHA · lowMotor start surgeNeeds 240VCheck your nameplate

  • Work light (LED)

    25 W running · 25 W starting

    CHA · high

  • Work light (halogen 500 W)

    500 W running · 500 W starting

    CHA · high

  • Job-site heater

    3,000 W running · 3,000 W starting

    CHA · medium

  • Battery charger (heavy duty)

    2,000 W running · 2,000 W starting

    CHA · medium
Motors (by horsepower)7

  • Motor 1/4 HP (capacitor-start capacitor-run)

    400 W running · 850 W starting

    HON · highMotor start surge

  • Motor 1/3 HP (capacitor-start capacitor-run)

    450 W running · 975 W starting

    HON · highMotor start surge

  • Motor 1/2 HP (capacitor-start capacitor-run)

    600 W running · 1,300 W starting

    HON · highMotor start surge

  • Motor 3/4 HP (capacitor-start capacitor-run)

    850 W running · 1,900 W starting

    HON · highMotor start surgeMay need 240V

  • Motor 1 HP (capacitor-start capacitor-run)

    1,000 W running · 2,300 W starting

    HON · highMotor start surgeMay need 240V

  • Motor 1.5 HP (capacitor-start capacitor-run)

    1,600 W running · 3,200 W starting

    HON · highMotor start surgeNeeds 240V

  • Motor 2 HP (capacitor-start capacitor-run)

    2,000 W running · 3,900 W starting

    HON · highMotor start surgeNeeds 240V
Running2,245 W
Peak3,345 W
Size4,500 W
Recommended generator size9 items

4,500W class

Your 3,345 W peak + 20% margin = 4,014 W, rounded up to the next 500 W.

Running
2,245W
Everything on at once
Peak
3,345W
+1,100 W when the sump pump starts

Starting 3,500 W as advertised; running 2,800 W is an estimate (80% of starting, the median of the generators we track). Use your nameplate values.

Your 3,500 W generator with your list

Works, little headroom

Covers your 3,345 W peak, but is under the 4,014 W target.

Also fits with your list (7)

Tap Add to put it on your list.

  • Ceiling fan 75/75 W
  • LCD monitor 30/30 W
  • Wi-Fi router or modem 20/20 W
  • Home security system 40/40 W
  • LED bulb (each) 15/15 W
  • CPAP machine (no heated humidifier) 60/60 W
  • Work light (LED) 25/25 W
Fits only if it runs on its own (57)

The unit can start it, but not on top of your current list.

  • Refrigerator (full-size) 400/1,200 W
  • Freezer (chest or upright) 500/1,000 W
  • Mini fridge or cooler 100/600 W
  • Sump pump 1/3 HP 800/1,600 W
  • Sump pump 1/2 HP 1,050/2,150 W
  • Well pump 1/2 HP 1,000/2,000 W
  • Furnace fan 1/8 HP (gas or oil) 300/500 W
  • Furnace fan 1/6 HP (gas or oil) 500/750 W
  • Furnace fan 1/4 HP (gas or oil) 600/1,000 W
  • Furnace fan 1/3 HP (gas or oil) 700/1,400 W
  • Furnace fan 1/2 HP (gas or oil) 875/2,350 W
  • Window air conditioner 5000 BTU 600/1,200 W
  • Window air conditioner 10000 BTU 1,500/2,400 W
  • RV air conditioner 11000 BTU 1,010/1,600 W
  • RV air conditioner 13500 BTU 2,000/3,500 W
  • Electric space heater 1,500/1,500 W
  • Radiant heater 1,300/1,300 W
  • Box or window fan 200/200 W
  • Microwave oven 1,500/1,500 W
  • Coffee maker 1,200/1,200 W
  • Toaster 1,200/1,200 W
  • Electric fry pan 1,500/1,500 W
  • Electric grill (tabletop) 1,650/1,650 W
  • Slow cooker 270/270 W
  • Blender 600/1,200 W
  • Air fryer 1,500/1,500 W
  • Portable induction cooktop 1,800/1,800 W
  • Electric smoker 1,200/1,200 W
  • Dishwasher (cool dry cycle) 216/540 W
  • Washing machine 1,200/2,300 W
  • Gas clothes dryer 700/2,200 W
  • TV (flat screen 20 to 55 inch) 400/400 W
  • Desktop computer 800/800 W
  • Laptop or phone charger 250/250 W
  • Printer 600/600 W
  • Satellite receiver 250/250 W
  • Radio 200/200 W
  • CPAP machine (heated humidifier) 120/120 W
  • Garage door opener 720/1,420 W
  • Reciprocating saw 1,200/2,400 W
  • Electric drill (1/2 in) 600/1,200 W
  • Hammer drill 1,200/2,400 W
  • Belt sander 1,200/2,400 W
  • Air compressor 1/2 HP 975/1,600 W
  • Pressure washer 1500 PSI 1,500/3,000 W
  • Work light (halogen 500 W) 500/500 W
  • Battery charger (heavy duty) 2,000/2,000 W
  • RV refrigerator 600/1,000 W
  • RV microwave 1,200/1,200 W
  • RV water heater (electric) 1,500/1,500 W
  • String or LED camp lights 200/200 W
  • Portable projector 300/300 W
  • Motor 1/4 HP (capacitor-start capacitor-run) 400/850 W
  • Motor 1/3 HP (capacitor-start capacitor-run) 450/975 W
  • Motor 1/2 HP (capacitor-start capacitor-run) 600/1,300 W
  • Motor 3/4 HP (capacitor-start capacitor-run) 850/1,900 W
  • Motor 1 HP (capacitor-start capacitor-run) 1,000/2,300 W
Too big for this unit (22)
  • Well pump 1 HP 2,000/4,000 W
  • Electric water heater 4,500/4,500 W
  • Central air conditioner 2 ton 2,500/4,500 W
  • Central air conditioner 3 ton 3,500/6,000 W
  • Central air conditioner 4 ton 5,000/8,000 W
  • RV air conditioner 15000 BTU 2,500/4,500 W
  • Electric range (one burner) 2,400/2,400 W
  • Dishwasher (heated dry) 2,400/2,400 W
  • Electric clothes dryer 6,000/6,750 W
  • Circular saw (7-1/4 in) 1,800/3,600 W
  • Table saw (10 in) 3,000/6,000 W
  • Miter saw (10 in) 1,800/3,600 W
  • Angle grinder (4-1/2 in) 1,800/3,600 W
  • Air compressor 1 HP 1,600/4,500 W
  • Air compressor 2 HP 2,500/7,500 W
  • Air compressor 3 HP 3,500/10,500 W
  • Pressure washer 2500 PSI 2,500/5,000 W
  • Welder (120V) 2,500/5,000 W
  • Welder (240V) 8,000/16,000 W
  • Job-site heater 3,000/3,000 W
  • Motor 1.5 HP (capacitor-start capacitor-run) 1,600/3,200 W
  • Motor 2 HP (capacitor-start capacitor-run) 2,000/3,900 W
Assumptions: 20% margin, 85% usable battery

Sources suggest 20–25% headroom over peak demand TTH · medium.

Inverter and battery losses. 85% is a common rule OUP · medium; EcoFlow’s own runtime examples imply 80%.

How we calculate

Other sizes

What can a 2,000 W generator run?

What can a 5,000 W generator run?

What can a 7,500 W generator run?