RV Power Inverter Size Calculator
Don't guess! Determine exactly how much inverter power you need to run your favorite appliances off-grid.
1. Select Your Appliances
Check all the items you plan to run simultaneously.
Add Custom Item
Your Power Needs
Running Watts 0W
Peak (Surge) Watts 0W
Recommended Inverter Size
300W
Battery Impact
Running this load will draw approximately:
0.0 Amps
from a 12V battery bank
Choosing the Right Inverter
An inverter converts 12V DC power from your batteries into 120V AC power for household appliances. Sizing it correctly is crucial for safety and performance.
Pure Sine Wave vs. Modified Sine Wave
- Pure Sine Wave: Produces clean power identical to your home outlet. Essential for sensitive electronics (laptops, medical devices), microwaves, and variable speed motors. Highly Recommended.
- Modified Sine Wave: Cheaper but produces "blocky" power. Can cause motors to run hot, audio buzz, and may damage some electronics.
Understanding Surge
Appliances with motors (A/C, fridge, blender) require a momentary burst of power to start up—often 2-3 times their running wattage. Your inverter must be able to handle this peak surge, even if it only lasts a fraction of a second.