Autotransformer Energy Optimisation

Autotransformer functions:

• Increased tension.
• Stress reduction.
• Voltage balance in separate phases.

Load Balancing Challenge:

• Phase separated power supply (120/240V, 30A).
• Current unbalance when connecting 120V loads.
• Loss of effective carrying capacity.

Theoretical vs. actual maximum power:

• Maximum theoretical power: 30 x 240 = 7.2kVA.
• After an unbalance of 20A: 30 x 120 + 10 x 120 = 4.8kVA (67% of the theoretical power).

Solution: Autotransformer

• Neutral disabled.
• Autotransformer creates a new neutral.
• Load unbalance absorption.
• Full load capacity of 7.2kVA even with 20A unbalance.

Earthing function:

• Essential for Multi or Quattro chargers/inverters.
• Controlled by Multi or Quattro devices at 230/240V.
• Neutral earthing in separate phase situations.

Overheating protection:

• Automatic shutdown in case of overheating.
• Manual re-initialisation.

Efficient Alternative to Overlapping Investors:

• 240V inverter with additional autotransformer.
• Balanced load up to 21A on each 120V branch.
• It avoids load capacity limitations.
• Efficient use of energy.

Datasheet Autotransformer Victron Autotransformer 120/240VAC-100A – ITR000100101

View Victron Autotransformer 120/240VAC-100A – ITR000100101 data sheet