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Inverter Loading Curve

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Inverter Loading Curve

Inputs

Adjust values to update results live

Nominal inverter power (W)

Current load (W)

Sustained AC output demand

8 min

Your time to overload shutdown comes out to about 8 min.

122.2% of derated 2,700 W · Standard off-grid (generic)

Warning: short overload window

Brief overload only — not suitable for continuous operation at this load.

Derated nominal

2,700W

90% of nameplate at 35°C

Load vs. derated

122.2%

3,300 W applied

Inverter profile

Standard off-grid (generic)

Overload curve family

Manufacturer overload curve (allowed run time vs. load %)

Y-axis: allowed run time (log scale, capped at 120 min for display). Amber dot = your current operating point.

Overload time table

Allowed run duration at common overload levels (derated nominal basis).

100% load (2,700 W)	Continuous
110% load (2,970 W)	60 min
120% load (3,240 W)	10 min

Sizing motor surge headroom? Start with Inverter Peak Load & Surge, then validate sustained overload here.

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How to use the Inverter Loading Curve

The Formula

Derated power = nominal × (1 − (T − 25°C) × 0.01). Hot installs lose continuous headroom before overload timing even matters.

Practical Example

Profiles model typical allowed run times at 110%, 120%, and above—log-interpolated between datasheet points. Always confirm against your exact model manual.

About Inverter Loading Curve

Derated power = nominal × (1 − (T − 25°C) × 0.01). Hot installs lose continuous headroom before overload timing even matters.

Profiles model typical allowed run times at 110%, 120%, and above—log-interpolated between datasheet points. Always confirm against your exact model manual.

Q: 110% for how long? A: Depends on profile—often ~30–60 min on off-grid units, much less on grid-tie. Q: vs. surge calculator? A: Peak Load & Surge sizes motor starts; this validates sustained overload. Q: Continuous safe? A: At or below 100% of derated nominal.

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Inverter SizingFind minimum inverter size from peak load and safety margin.Use this to choose an inverter that handles your loads with room to spare.
Inverter Loss CalculatorConvert DC input watts to AC output and show power lost as heat in the inverter.Use this to see how much battery energy your inverter wastes as heat.

How to use the Inverter Loading Curve

The Formula

Derated power = nominal × (1 − (T − 25°C) × 0.01). Hot installs lose continuous headroom before overload timing even matters.

Practical Example

Profiles model typical allowed run times at 110%, 120%, and above—log-interpolated between datasheet points. Always confirm against your exact model manual.

About Inverter Loading Curve

Derated power = nominal × (1 − (T − 25°C) × 0.01). Hot installs lose continuous headroom before overload timing even matters.

Profiles model typical allowed run times at 110%, 120%, and above—log-interpolated between datasheet points. Always confirm against your exact model manual.

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