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Topic: Service cable for 3 phase 40.8kVA solar based system

User: bsreekanth, Location: Columbus, OH

Asked on: Thursday, July 24, 2025 at 10:42 pm EDT
Answered on: Thursday, July 24, 2025 at 11:05 pm EDT

Question: HelloI am helping to design a solar electric system, which combines two sets of 3 inverters configured in three phase.The architecture is explained in XW Pro Multi-unit Design Guide; specifically page 45 Three-phase with External Contactor.Schneider engineer explain how to combine the two sets by parallelling them in two, 3 pole 60A breaker in this video at timestamp 32:58.

Okay, I understand. You're working on a solar electric system using Schneider Electric XW Pro inverters configured in two separate three-phase arrays, and you're looking to parallel them using the technique described in the XW Pro Multi-unit Design Guide (page 45) and demonstrated in a Schneider Electric video around the 32:58 timestamp.Essentially, you're paralleling the output of the two three-phase inverter sets using two 3-pole 60A breakers.To help me give you the best advice, tell me what you are seeking. Are you: Seeking confirmation that your understanding is correct? Wanting to know best practices for this setup? Concerned about specific aspects of the wiring or safety? Looking for alternative or optimized ways to parallel the outputs? Needing help sizing conductors or other components? Wondering how to calculate the total output current? Or something else entirely?

The more information you provide, the better I can assist you. Specifically, knowing the following would be helpful:
Model of the XW Pro inverters being used

The specific model will dictate the maximum output current per phase.

Total PV array size (kW)

This will give me an idea of the potential DC power feeding the inverters.


Voltage of the AC grid you're connecting to

208V or 480V?

Intended use of the system

Grid-tie, off-grid, or hybrid?


Any existing single line diagram of the system?


Looking forward to your response so I can assist you! Flag for review

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