Electrical UPS autonomy from curve calculator

Calculate interpolated runtime and available runtime after reserve with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use interpolated runtime and available runtime after reserve to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Supplier load points (kW)
1,2,3
Supplier runtime points (minutes)
60,25,12
Actual load (kW)
1.5
Reserved runtime fraction (%)
20
Interpolated runtime (minutes)
42.5
Available runtime after reserve (minutes)
34

Try another scenario

Supplier load points (kW)
[1.1, 2, 3]
Supplier runtime points (minutes)
[60, 25, 12]
Actual load (kW)
1.5
Reserved runtime fraction (%)
20
Interpolated runtime (minutes)
44.444444
Available runtime after reserve (minutes)
35.555556
Calculation method

Calculation method

Interpolated runtime (minutes)

Piecewise-linear runtime interpolation within supplied curve; reserve is an explicit percentage deduction.

Available runtime after reserve (minutes)

Piecewise-linear runtime interpolation within supplied curve; reserve is an explicit percentage deduction.

Symbols and units
a
Supplier load points (kW)
b
Supplier runtime points (minutes)
c
Actual load (kW)
d
Reserved runtime fraction (%)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Piecewise-linear runtime interpolation within supplied curve; reserve is an explicit percentage deduction. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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