Updated 2025-12-08
Phase Balancing
What is phase balancing?
Phase balancing, also known as ACE (Adaptive Current Equalization), means that EnergyHub moves power between the three incoming phases of the property to ensure that the consumed power in the property is evenly distributed between the phases. In this way, it counteracts phase imbalances such as when one of the phases is more loaded as a result of many electrical components being installed on the same phase.
Phase balancing works like this:
EnergyHub
- draws power from the phases that have a lower load
- converts AC power to direct current to move it
- converts direct current back to alternating current
- sends AC power to the high load phase
The benefits of this include:
- This prevents the main fuse from blowing if the consumption on one of the phases becomes too high.
- It enables the operation of a single-phase load that consumes more current on one phase than the main fuse is marked for, e.g. single-phase charging of an electric car.
- This makes the maximum amount of space available for three-phase charging of an electric car by distributing all other consumption evenly between the phases.
Example:
In the picture to the left, we can see what the consumption looks like on the three phases into the property.
- On phase 1, the consumption is 15 A
- On phase 2, the consumption is 29 A
- On phase 3, the consumption is 13 A
What the EnergyHub does in this case is that it sucks in 4 A from phase 1 and 6 A from phase 3 and sends out 10 A on phase 2. This means that even though the consumption is still the same in the house, the current that goes over the main fuse is 19 A per phase as we see in the picture to the right.
How do I set up phase balancing?
Go to: EnergyCloud/ System settings/ System configuration
Set the threshold for when EnergyHub should start phase balancing, i.e. when it should move power from the other phases to make it easier for the phase that goes over the threshold value.
Turn on the function by clicking the button so that it is highlighted in green.
NOTE:
Ferroamp recommends an Arms value that corresponds to 75% of your main fuse, when charging an electric car you need a value that is at least 8A below the main fuse.
NOTE:
The settings will not be implemented until you have clicked “UPDATE” and sent the settings to your EnergyHub.
How much phase balancing does an EnergyHub have access to?
Each EnergyHub has a phase balancing capacity of 20 A regardless of size. The phase balancing capacity indicates how much current can be moved between the phases.
For our EnergyHub rack cabinets, this means that it is possible to get up to 100 A phase balancing capability.
For example:
- An EnergyHub Cabinet 24U containing three EnergyHub XL modules provides 60 A phase balancing capability.
- An EnergyHub Cabinet 42U containing five EnergyHub XL modules provides 100 A phase balancing capability
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