Inverter Sizing Calculator
RV electrical build, off-grid van conversion, emergency home backup inverter selection. Interactive appliance selector that computes total continuous load + largest inductive motor surge to recommend minimum Pure Sine Wave inverter size.
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical equations and National Electrical Code guidelines.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between List of Appliances (Fridge, TV, Microwave, Tools, Lights) with Running & Starting Watts to determine Recommended Inverter Continuous Watts, Surge Rating (W), Recommended DC Cable Gauge. In practical applications, electrical systems must account for safety derating factors, nominal vs actual voltages, and conductor resistance losses.
Interactive appliance selector that computes total continuous load + largest inductive motor surge to recommend minimum Pure Sine Wave inverter size.
Typical Application & Best Practices
RV electrical build, off-grid van conversion, emergency home backup inverter selection.
Inverter Sizing Calculator Benchmark Lookup Table
| Typical Household Load | Running Watts | Starting Surge | Recommended Inverter |
|---|---|---|---|
| Laptops, Lights, Starlink | 250 W | 350 W | 600 W Pure Sine |
| Refrigerator + TV + Fans | 600 W | 1,800 W | 1,500 W / 3,000 W Surge |
| Microwave + Coffee Maker | 1,500 W | 2,200 W | 2,000 W / 4,000 W Surge |
| Well Pump / Power Tools | 1,800 W | 4,500 W | 3,000 W / 6,000 W Surge |
| RV Air Conditioner (15k BTU) | 1,800 W | 3,600 W | 3,000 W / Soft-Start |
| Whole Off-Grid Cabin | 3,500 W | 7,000 W | 5,000 W / 10 kW Surge |