The absence of a neutral line in the electrical system can cause issues with the Gen 2, but depends on how the system itself behaves.
In many situations customers looking to use the Gen 2 will not have a neutral line available for the wire harness to be terminated to. In these situations you can substitute your ground/earth line as a replacement for a neutral line - meaning that given the installation scenario for your wire harness installation (as determined by number of phases in the system), you can terminate the wire harness wires to ground/earth instead of neutral.
This substitution will work great as long as your ground/earth line doesn't have any errant voltage on it. The Gen 2 device uses neutral as a baseline for measurement accuracy, so if the ground/earth line has errant voltages, it will mess up the device measurements as its baseline voltage will be skewed incorrectly.
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This knowledge base is pretty new for the Emporia team. Our goal is to provide all of the information we can to help you manage your energy in better ways. If this article wasn't helpful, or we could be more clarifying on any points please reach out to the Customer Support team and we'll certainly work to improve these guides.