In this guide, we will cover what can a 4000 watt generator run, the top 3 best 4000-watt generators, the most searched questions about this, and helpful tips.
Due to the growing number of natural disasters and power outages, the sales volume of portable generators has exponentially increased.
A 4000-watt generator is the most popular choice for backup power, camping, and RV because it is not too big, and not too small in terms of size and power. (check out our buying guide about the portable Rv generators)
Usually, a 4000-watt generator approximately provides 33.4 amps for 120v and 16.7 amps for 240v. In simple terms, it should run the following appliances:
Above mentioned appliances and their wattage levels are a rough estimation. Before we break it down, you would need to understand peak/surge watts, and running watts.
What are Starting Watts and Running Watts?
Starting/peak watts: The surge of maximum power the generator can provide for a few seconds to start motor-driven appliances.
Motor-driven appliances need a few extra watts from their original capacity to overcome inertia and start. Later, these appliances settle down to their rated capacity.
Rated/running watts: The amount of power the generator can provide constantly for hours. Rated or running watts are always less than the starting watts. Not all appliances need an initial push to start.
Before purchasing a generator, check its starting and running watts, then calculate starting and running watts of appliances you need to run.
Sometimes people purchase 4000-watt generators without even knowing the rated and surge watts of devices they need to start and they later complain about the generator.
Recommended Read: What Will A 12000 Watt Generator Run
What Can A 4000 Watt Generator Run?
A 4000-watt generator provides enough power to run the following appliances:
|Appliance||Quantity||Peak watts||Running watts|
|A standard fridge||1||1200||200|
|AC (10,000) BTU||1||4400||3000|
|Sump Pump||1||800||1500 to 300|
Suppose a generator is rated at 3800 watts, and 4000 peak watts. If you need to run 4 appliances together whose running watts collectively are 3600 watts, and 3900 starting watts, so in theory, your generator should provide enough power to run all four appliances at once.
But, you shouldn’t push it to its peak because not all generators provide as much power as they advertised. So be careful.
Checkout our guide about what can a 3500 watt generator run?
Can A 4000-Watt Generator Run A Central Air Conditioner?
Yes. It can surely run a central AC system of 10,000 BTU.
|AC UNIT||Peak watts||Running watts|
Will A 4000 Watt Generator Run Space Heaters?
Absolutely. Normal space heaters take 1750 to 1800 running watts, and 1800 starting watts. You can easily run 2 space heaters if you want. Nowadays, there are even more efficient space heaters in the market.
Will A 4000-Watt Generator Run A Microwave, Fridge?
It should easily run both without any problem. A standard microwave takes about 1000 running watts, a fridge takes 1200 to 1000 surge watts, and 200 running watts (check out our guide about is it safe to run a refrigerator on a generator?). Run some other low-wattage appliances with these two at a time as well.
Can A 4000 Watt Generator Run A Circular Saw?
YES. A circular saw takes about 1400 running watts, and 2300 starting watts. It will run two circular saws at once if they are energy efficient.
What Will A 4000-Watt Generator Run For A Work Site?
Below is an estimated power requirement of various tools on a site. Calculate the surge and running watts of each appliance, then compare it with your generator.
Mostly, 10000-watt generators are preferred for work sites, but a 4000 should do the job if there is no other option available.
Checkout our guide about best 5000 watt generators?
|Appliance||Running watts||Surge watts|
|Electric drill||600 watts||600 watts|
|Portable air compressor ½ HP||1000||1600|
How To Safely Run A 4000-Watt Generator?
Alex Black is a seasoned electrical engineer with a remarkable 8-year track record specializing in appliances, generators, and transfer switches. With extensive hands-on experience in the field, Alex possesses a deep understanding of electrical systems and their intricate workings. Throughout their career, Alex has consistently demonstrated expertise in designing, troubleshooting, and maintaining various electrical appliances.