Inverter Sizing
Calculator
Results
- Continuous rating (W)
- 2,000
- Surge rating (W)
- 6,000
- DC input power (W)
- 2,173.913043
- DC input current (A)
- 45.289855
Energy results
| Continuous rating (W) | 2,000 |
| Surge rating (W) | 6,000 |
| DC input power (W) | 2,173.913043 |
| DC input current (A) | 45.289855 |
formula-map diagram
- Continuous rating (W)
- 2,000
- Surge rating (W)
- 6,000
- DC input power (W)
- 2,173.913043
- DC input current (A)
- 45.289855
Energy relationship
Formula
P_dc = P_ac ÷ η; I_dc = P_dc ÷ V_bus; surge = P_ac × factor= 2000
Note
This is a simplified model: it applies the standard equation to the numbers you entered and ignores real-world losses, weather variation, tariff structures and equipment tolerances. Wind power assumes air density 1.225 kg/m³ at ISA sea level and the power coefficient you enter (Betz limit 0.593). Verify with measured data or a professional energy audit before making purchasing decisions.
More in Energy and environment
See all →Frequently asked questions
Should I size the inverter for running watts or starting watts?+
Size for both: the inverter's continuous rating must exceed the sum of running watts for all simultaneous loads, and its surge rating must exceed the highest starting watts, since motors and compressors can draw 2-3 times their running wattage for a brief moment at startup.
What happens if I undersize the inverter?+
An undersized inverter will trip, shut down, or fail to start motor-driven appliances when the load exceeds its continuous or surge rating. Repeated overloading can also shorten the inverter's lifespan or damage it.
Why add a safety margin on top of my calculated load?+
A margin, typically 20%, accounts for future added loads, inverter efficiency losses, and the fact that appliances often draw slightly more than their nameplate rating. Sizing exactly to the calculated total leaves no headroom for these normal variations.
Do I need to add up every appliance in the house?+
Only the appliances you'll realistically run at the same time, since inverter sizing is about peak simultaneous demand, not total household capacity. Running a load list scenario by scenario often reveals your true peak is lower than adding everything together.
How does inverter efficiency affect the sizing?+
Inverters aren't 100% efficient, typically converting at 85-95% efficiency, so some of the input power is lost as heat during DC-to-AC conversion. This mostly matters for battery runtime calculations rather than sizing itself, but it does mean the battery must supply slightly more than the AC load requires.