THE GENERATORCALC FIELD GUIDE
Generator Sizing & Backup Power Guides
Generator sizing guides built on our free generator calculators: appliance watts, RV setups, outage planning and finding the generator size that fits.
Latest guides
Practical answers. Clear next steps.Appliances and equipment 5 min read
Portable Monitor Power Consumption
For the registered 15.6-inch USB-C portable monitor example, use 8 W as the running-power planning value. This is an upper bound for the registered example, not measured typical consumption or a universal rating for portable monitors. The available data does not provide separate values for differ…
Appliances and equipment 5 min read
How Many Watts Does a Laptop Charger Use?
For one laptop used with its conventional AC charger, the registered running-power value is 75 W range 20–250 W. The supplied starting-power value is also 75 W range 20–250 W. If you do not know your laptop's demand, use 75 W as a typical planning value. If its adapter or manufacturer documentati…
Appliances and equipment 5 min read
Diesel Heater Amp Draw for a 12 V, 2 kW-Class Air Heater
For one 2 kW-class diesel/gas air heater, the supplied steady operating values are 1.25–2.45 A and 14–29 W at 12 V DC. These are planning values for the bound example, not universal specifications for every diesel heater. The range covers steady operation—not the ignition peak. The glow pin draws…
Appliances and equipment 5 min read
Cordless Tool Charger Wattage
For one cordless-tool battery charger connected to 120 V AC, the supplied planning value is 360 W range 25–1,000 W. The engine reports starting demand as 360 W range 25–1,000 W; it does not add a separate motor-like startup surge. The broad range covers lower-draw chargers through higher-draw mul…
Appliances and equipment 5 min read
Air Compressor Running and Starting Watts
For planning, use 300 W running and 780 W starting for a 1/3 HP air compressor. For a 1 HP compressor, use 1,450 W range 1,400–1,500 W running and 4,050 W range 3,600–4,500 W starting. For a 2 HP compressor, use 2,500 W running and 7,500 W starting. | Compressor class | Running power | Starting d…
Appliances and equipment 5 min read
12 V Fridge Power Consumption
For the registered example—an approximately 55 L 12 V compressor fridge/freezer—the maximum running input is up to 104 W at 12 V DC. Its cycling consumption is registered as about 13 W average at 12 V DC, based on 1.1 Ah per hour at 12 V and 32 °C ambient temperature. The rated DC input is 8.7 A.…
Home backup 7 min read
What Can a 9,000 Watt Generator Run?
If 9,000 W is the generator’s continuous running rating, the default check places 36 of the 48 reviewed appliance profiles within the scenario’s running and starting limits. The other 12 require 240 V, so they remain unknown until the generator’s 120/240 V output is confirmed. No registered appli…
Home backup 8 min read
What Can a 6,500-Watt Generator Run?
If 6,500 W is the generator’s continuous running rating, the bound check places 36 of the 48 registered appliances within the modeled capacity. Another 12 remain unknown because they require 240 V, which has not been confirmed. No individual appliance exceeds the running-watt limit, but the 4-ton…
Home backup 9 min read
What Can a 5,000 Watt Generator Run?
A generator labeled 5,000 W can run many household essentials, but the label alone is not enough to decide what it can run. First determine whether 5,000 W is the generator’s continuous running rating or its maximum starting—or surge—rating. Do not treat it as both. If 5,000 W is the running rati…
Home backup 8 min read
What Can a 4,000 Watt Generator Run?
If 4,000 W is the generator’s continuous running rating, the default checker places 36 of the 48 registered appliances within that limit when each is checked individually. It marks 4 as exceeded and leaves 8 conditional because 240 V output has not been confirmed. Some motor-driven loads also req…
Home backup 7 min read
What Can a 12,000 Watt Generator Run?
A generator labeled 12,000 W can support many household essentials if 12,000 W is its continuous running rating. If 12,000 W is only its peak or starting rating, there is not enough information to determine what it can run continuously. Under the running-rating interpretation, this check places 3…
Home backup 8 min read
What Can a 10,000 Watt Generator Run?
If 10,000 W is the generator’s continuous running rating, the bound check places 36 of 48 registered appliance profiles within the known limit. This result uses the model’s assumptions, including one motor starting at a time and peak capacity being at least as high as running capacity. The remain…