# Power assessment.

> Online power assessment: diversified power, current per phase, indicative rating and source. Free demo, full access reserved for our clients.

Source: https://www.darkside-energy.com/en/power-assessment/ · Dark Side Energy · Updated: 2026-10-06

List your equipment and enter its power and diversity factor: the tool calculates the power required, the current on each phase and an indicative connection rating.

Free demo up to 4 lines, full version reserved for our clients by invitation. Your assessment data stays in your browser.

## A few pointers for filling in your assessment.

### Unit power

Read it on the equipment's rating plate or data sheet, in watts. If in doubt, our teams draw on field data gathered since 2016.

### The diversity factor

1 if all the equipment on the line runs at full power at the same time, less otherwise. A realistic diversity factor avoids overcapacity, and therefore unnecessary equipment and energy.

### The line type

Choose “3ph” for equipment connected in three-phase and “1ph” for the rest. Leave the phase on “Auto” so that the tool balances the phases.

### Calculation method

1. Installed power of a line = quantity × unit power.
2. Diversified power = installed power × [diversity factor](https://www.darkside-energy.com/en/glossary/#foisonnement).
3. Apparent power = diversified power ÷ cos φ.
4. Current: apparent power ÷ 230 V in single-phase, or ÷ (√3 × 400 V) on each phase in three-phase.
5. Phase allocation: three-phase lines load all three phases; single-phase lines set to “Auto” are placed one by one, from the most to the least powerful, on the least loaded phase.
6. Indicative rating: the standard rating (16, 32, 63, 125, 250, 400 A…) immediately above the current on the most loaded phase, including the reserve.
7. Indicative source: 3 × 230 V × current on the most loaded phase, including the reserve (230 V × current in single-phase).

## Have your assessment validated.

Send us your assessment: our engineering office checks it and proposes a suitable power distribution.

[Send my assessment](https://www.darkside-energy.com/en/contact/?objet=bilan)
[contact@darkside-energy.com](mailto:contact@darkside-energy.com)