What size inverter do I need for a house?
Ava Arnold
Updated on February 25, 2026
Short Answer: The size you choose depends on the watts (or amps) of what you want to run (find the power consumption by referring to the specification plate on the appliance or tool). We recommend you buy a larger model than you think you'll need (at least 10% to 20% more than your largest load).
What size inverter do I need for a whole house?
Peak output is the wattage that an inverter can supply for short periods of time when the demand spikes, while continuous output is the limit for normal operation. If your devices draw a combined total of 600 watts, then you need to buy an inverter that has a continuous output rating of 600 watts.What inverter do I need for my house?
Calculate approximate startup load (peak/surge watts)You would need an inverter with a continuous rating of approximately 1500 watts and with a peak/surge rating of approximately 3500 watts. It is always advisable to build in a safety factor by overrating the continuous rating by 20 – 25% .
How do I calculate what size inverter I need?
CALCULATE THE TOTAL POWER NEEDEDThe total power needed will be calculated as “Power = Wattage of appliance x Quantity.” Therefore, you'll need a total power of (125×1) + (15×8) bulbs + (56×2) fans + (25×1) decoder + (85×1) = 467W.
What can a 3000W inverter run?
What Will a 3000W Inverter Run?
- Refrigerator: 350 - 780 watts.
- Microwave: 1500 - 2000 watts.
- Coffee machine: 800 - 1200 watts.
- Fluorescent light bulb: 25 watts.
- Incandescent light bulb: 100 watts.
- Cell phone: 50 watts.
- Laptop: 25 -150 watts.
- Ceiling fan: 75 - 120 watts.