How does the inverter calculator work?
This calculator helps you determine the right inverter size for your RV. An inverter converts 12V/24V DC from your battery bank to 230V AC for your household appliances. It accounts for both continuous power and startup surges.
Frequently asked questions
Pure sine wave or modified sine wave?
Always choose a pure sine wave inverter for an RV. Modified sine wave inverters are cheaper, but can damage sensitive electronics such as laptops, chargers, and induction cooktops.
How do I find the startup factor?
Resistive appliances (kettle, toaster, hair dryer) have no startup surge — use factor 1×. Motor-driven appliances have a surge: compressor fridge 3-5×, airco 3-5×, power tools 2-3×, blender 3-4×. When in doubt, use 3×.
What is the peak rating of an inverter?
Most inverters can deliver 2× their continuous rating for a few seconds. A 1000W inverter can handle a 2000W startup peak. This calculator uses the 2× factor to verify that the inverter can handle your surge load.
Can I run everything at the same time?
Only if your inverter and battery bank can handle the combined load. Mark only the appliances you realistically use at the same time as simultaneous.
What is the difference between pure and modified sine wave?
Pure sine wave delivers the same power as a home outlet. Sensitive devices like laptops and medical equipment need this. Modified sine is cheaper but can cause buzzing or damage devices.
Can I use an induction cooktop on an inverter?
Yes, but you need at least a 3000W inverter and a battery bank that can handle the high current. At 12V, a 2000W cooktop draws over 180A. Consider a 24V system.
What's the difference between a 30A and 50A shore power hookup?
A 30A hookup (TT-30 plug) provides about 3,600 watts at 120V — enough for most RVs. A 50A hookup (14-50 plug) provides two 120V legs totaling 12,000 watts, needed for larger RVs with dual air conditioners or electric heating. Most van conversions only need 30A.