Victron Energy ITR000100101 Autotransformer for Split Phase 120/240V, 100 Amp

Autotransformer - Split Phase 120/240V - 100AMP

The Autotransformer: for step up, step down and split phase balancing An autotransformer can be used for step up, step down and split phase output balancing purposes. While the step up and step down functions are fairly straightforward, split phase output balancing may require some more attention.

Consider for example a 30A 120/240V split phase supply. The supply could be the grid, a generator or two stacked inverters. Some of the loads connected are 240V, others are 120V. On each 120V leg the load should not exceed 30A. The problem is that as soon as 120V loads are connected, the two legs will show a different current. This is because the 120V loads on the two legs will never be balanced. A 120V 1200W hairdryer, for example, will draw 10A from one leg. A 120V washing machine could even draw in excess of 20A from one leg. Between the two legs the difference in current, or current unbalance, will therefore often be 20A or more. This means that the 30A supply will not be used up to its full potential. By the time one leg draws 30A, the other leg may be drawing no more than 10A, and increasing the 240V load, for example, will result in an overload of one leg while the other leg still has spare capacity. Theoretically, the total power that can be drawn from a 30A 120/240V supply is 30 x 240 = 7,2 kVA. In case of 20A unbalance, the practical maximum will be 30 x 120 + 10 x120 = 4,8kVA, or 67% of the theoretical maximum. The solution is an Autotransformer. By leaving the neutral of the split phase supply unused, and connecting an Autotransformer to create a new neutral, as shown in figure 1, any load unbalance is absorbed by the Autotransformer. In case of a 30A supply, the load can be increased to 7,2kVA, and a 20A load unbalance will result in one leg supplying 40A, and the other leg 20A. The 20A difference will flow through the neutral and the windings of the Autotransformer. The current through both 120V wires of the split phase supply will be 30A.

Temperature protected In case of overheating, the Autotransformer is disconnected from the supply. Reset is manual.Ground relay for use with Multi or Quattro Inverter/Chargers included When operating in inverter mode, the neutral output of the inverter/charger must be connected to ground to guarantee proper functioning of a GFCI. In case of a split phase supply the neutral must be grounded. For this purpose a grounding relay is built in the autotransformers enclosure. The relay is controlled by the 230/240V Multi or Quattro. (The internal grounding relay in the 230/240V Multi or Quattro must be disabled)

An alternative to stacked inverters The alternative to stacking two 120V inverters to provide a 120/240V split phase supply is a 240V inverter with an additional Autotransformer.

Warranty Info

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.

The Victron Energy ITR000100101 autotransformer is designed to enhance the flexibility and efficiency of your split phase power system. Ideal for applications requiring step-up, step-down, or split phase output balancing, this autotransformer helps optimize load capacity and prevent current unbalance issues. It is particularly useful in setups involving generators, grid supplies, or stacked inverters where multiple loads draw power at different voltages and currents. By connecting the autotransformer to create a new neutral, it effectively absorbs load imbalances, allowing you to utilize the full rated capacity of your power supply. For example, in a typical 30A 120/240V system, the autotransformer enables a maximum power draw of up to 7.2 kVA, even when load unbalance exceeds 20A, which would otherwise reduce the system's efficiency to approximately 4.8 kVA. This results in better utilization of your power infrastructure and reduces the risk of overloads on individual legs, ensuring safer and more reliable operation. The autotransformer features a temperature protection system that automatically disconnects the unit in case of overheating, requiring manual reset to restore operation. It also includes a ground relay compatible with multi or Quattro inverter/chargers, which is essential for proper GFCI functioning in inverter mode. When operating with a split phase supply, grounding is maintained through the relay, supporting safe system operation. An alternative to stacking multiple inverters is to use a high-capacity inverter combined with this autotransformer, simplifying system design and reducing equipment complexity. For detailed installation instructions and warranty information, please refer to the provided owners manual link. This product is manufactured by Victron Energy and is suitable for various residential or commercial power systems requiring reliable split phase balancing and load management. Note that this autotransformer is not classified as oversized or truck freight, making it easier to handle and install in typical environments. Please consult your dealer for support, repairs, or returns to ensure proper system integration and performance.

Features:

• Designed for step-up, step-down, and split phase output balancing

• Enables full utilization of 120/240V, 30A power supplies

• Absorbs load unbalances up to 20A between legs

• Temperature protected with manual reset in case of overheating

• Includes ground relay compatible with Victron inverter/chargers for GFCI safety