Is Split Phase Inverter Dual Voltage Output Independent?

Xindun has previously shared several articles introducing various aspects of split phase inverter. The previous article, "How does split phase inverter distribute load power under dual voltage output?", explained how the load power is distributed under two different voltage and what limitations exist.

However, many users still ask whether the dual voltage output of split phase inverter refers to two independent AC voltage outputs.

Dual voltage output of split phase inverter refers to the inverter providing two AC voltage specifications simultaneously, such as 120V and 240V AC voltage, to meet the adaptation requirements of different voltage loads. It is suitable for use in dual voltage regions such as North America that use the US standard power system.

Taking the Xindun HU split phase inverter as an example, in split phase mode, it can provide dual voltage outputs simultaneously:

120V phase voltage (two independent branches: L1-N, L2-N);

240V line voltage (one superimposed branch: L1-L2).

The dual independent voltage of split phase inverter refers to the AC phase voltage output of two independent 120V branches (L1-N, L2-N), not dual independent AC voltages of 120V and 240V. L1-N and L2-N are electrically independent and phase symmetrical 120V power supply branches, while the 240V of L1-L2 is the series superposition of the two 120V phase voltage branches (L1-N, L2-N), not an additional independent branch. The two voltage can be used simultaneously and independently, but they are not two independent voltage.

L1-N and L2-N each have their own independent power modules and power supply circuits. 120V (L1-N, L2-N) loads are connected via two separate circuits to avoid overload on single branch. 240V (L1-L2) loads occupy separate superimposed branch, without affecting the independence of the 120V branch.

These two voltage is not two completely separate power supplies, but rather, through internal dual independent branch and phase difference design, the inverter achieves dual voltage specifications. Essentially, it's single inverter integrating two voltage output capabilities.

For example, taking the Xindun 10KW HU series split phase inverter as an example, when 2KW of household appliances are connected to each of the 120V (L1-N, L2-N) terminals, even if one terminal experiences power outage (e.g., due to a load failure), the other terminal can still supply power normally, and each terminal can independently carry the load (single branch power ≤ 50% of the total rated power).

When 3KW power load is connected to the 240V (L1-L2) circuit, it is actually powered by the two branches of 120V (L1-N, L2-N), but this will reduce its power quota. The remaining total power (L1-N, L2-N) = 10KW (inverter rated power) - 3KW (L1-L2) = 7KW (L1-N≤3.5KW, L2-N≤3.5KW). The 240V (L1-L2) circuit carries the power of the inverter's total power module and does not have 50% limit on the rated power. The upper limit of the 240V (L1-L2) circuit is the inverter's rated total power.

Therefore, the dual voltage output of split phase inverter does not refer to outputting two completely independent AC voltages with different specifications (such as 120V and 240V). Rather, it refers to the simultaneous output of two independent branches (L1-N, L2-N) providing 120V phase voltage, which are then connected in series to form 240V line voltage branch (L1-L2), thus achieving the simultaneous output of both voltage specifications. This design satisfies the needs of independent 120V loads while also accommodating 240V loads, representing clever integrated solution rather than a simple combination of two independent voltage source.

Therefore, users need to have certain understanding of split phase inverter. When understanding and using them, it is crucial to clearly understand the independence of the two 120V branches and the inherent relationship between the 240V branch and them. This will allow users to correctly configure and use the load, ensuring the stable operation of the inverter and the safe power consumption of the load.

For further information about Xindun split phase inverter solutions, please leave a message in the customer service window at the bottom of the website(https://www.xinduninverter.com/), and we will contact you as soon as possible.