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REFRIGERATION

Calculator

Stabiliser size calculator

Compressors draw several times their running current for a moment at start-up. A stabiliser sized only on running watts can drop out or fail exactly when the compressor needs it most.

W

Rated input power from the spec plate.

0.8 is a common assumption for small compressors.

Allows for compressor starting current.

Suggested stabiliser
1.5 kVA
Running load
500 VA
With start-up allowance
1.5 kVA

Choose a stabiliser rated for refrigeration (with a time delay on restart). Confirm with the equipment maker and have an electrician check wiring and earthing.

How this is calculated

  1. Running VA = running power (W) ÷ power factor (0.8 is a common assumption for small compressors).
  2. Start-up allowance: compressors briefly draw several times running current. Stabilisers for refrigeration are usually rated with that surge in mind — check the stabiliser maker's refrigeration rating.
  3. Suggested rating = running VA × safety factor (we use 3 by default), rounded up to the next common size.
  4. This is an estimate. Follow the refrigeration maker's guidance where it differs, and have an electrician confirm wiring and earthing.

Results are planning estimates, not a design. For a binding specification, share your site details and we'll check them.

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