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Victron autotransformer 120/240VAC-100A

Victron EnergySKU: ITR000100101

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Sale price€676,39 EUR

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Description

The autotransformer: for balancing step-up, step-down and gap phases
An autotransformer can be used to balance step-up, step-down, and split-phase outputs. While the step-up and step-down functions are fairly simple, balancing the split phase output requires a little more attention.
Let's take a 30A 120/240V split phase supply as an example.
The supply can come from the grid, a generator or two coupled inverters.

Some of the connected loads require 240V, others 120V. On any 120V circuit the load should not exceed 30A. The problem is that the two circuits have different currents as soon as 120 V loads are connected. The reason for this is that the 120V loads on the two circuits will never be balanced. For example, a 120V 1200W hair dryer will draw 10A from one circuit. A 120V washing machine can even draw more than 20A from one circuit. The current difference between the two circuits, also known as current imbalance, is therefore often 20 A or more. This means that the 30 A supply is not fully utilized. Once one circuit is drawing 30A, the other circuit may not be drawing more than 10A. For example, increasing the 240V load will then overload one circuit while the other circuit still has spare capacity.
Theoretically, the total capacity of a 30A, 120/240V power supply = 30 x 240 = 7.2 kVA.
In the case of an unbalance of 20 A, the practical maximum is 30 x 120 + 10 x 120 = 4.8 kVA or 67% of the theoretical maximum.
The solution is an autotransformer.
Leaving the split-phase supply neutral and connecting an autotransformer as the new neutral, as shown in Figure 1, will cause any load imbalance to be “absorbed” by the autotransformer.
In the case of a 30 A supply, the load can be increased to 7.2 kVA. A 20A load imbalance will result in one circuit delivering 40A and the other 20A. The difference of 20 A flows through the neutral wire and the coil of the autotransformer. The current through the two 120V lines of the split-phase supply is 30A.
Includes ground relay for use with Multi or Quattro inverters/chargers
When operating in inverter mode, the inverter/charger neutral must be connected to ground for a GFCI to function properly. In the case of a split-phase supply, the neutral must be grounded. For this purpose, a grounding relay is built into the housing of the autotransformer. The relay is controlled by the 230/240V Multi or Quattro. (The internal grounding relay of the 230/240V Multi or Quattro must be deactivated)
Temperature protected
In the event of overheating, the autotransformer is disconnected from the power supply. The reset is done manually.
An alternative to coupled inverters
The alternative to coupling two 120V inverters together for a 120/240V split phase supply is a 240V inverter with an additional autotransformer.
Two stacked 120V 3kVA inverters supply up to 25A to each 120V circuit. If the load on one circuit is less than 25A, the maximum load on the other circuit is still limited to 25A.
A 240V 5kVA inverter with a 32A autotransformer supplies each 120V circuit with a balanced load of up to 21A. However, fewer loads on one circuit result in more power being available on the other circuit, where the maximum unbalance is 32 A.
The load can therefore be up to 38.5A on one circuit if the load on the other circuit is not more than 3.5A (maximum unbalance: 38.5 / 3.5 / 35A When connected with an unbalanced load to is to be expected, a 240 V inverter with lower power and autotransformer is therefore preferable to the solution with coupled inverters.

GPSR Information

Hersteller
Name: Victron Energy BV
Anschrift: The Palm 35
PLZ, Ort: 1351, JG Almere
Land: Netherlands
Email: sales@victronenergy.com
Web: https://www.victronenergy.com

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