How to add Enphase Power Control System (PCS) MPU Avoidance Mode to Lyra projects in order to avoid a main panel upgrade
By adding an Enphase Power Control System (PCS) MPU Avoidance Mode to arrays, designers can install a main panel tie-in and avoid main panel upgrades for larger projects that normally would require a main panel upgrade.
Prerequisites:
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Project is on NEC 2020, NEC 2023, or CEC 2022
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Project has a Enphase partial home backup configuration
During the Electrical BOS step, simply select the interconnection method Main Panel Tie-In: Standard load-side tie-in. MPU Avoidance Mode to be activated with current limited to xA
(the amperage will be project specific). See example below.
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How it looks in the single line diagram
Between the microgrid interconnect device (MID) and the PV system disconnect you'll find a new note in pink that states "PCS set to MPU avoidance mode and current limited to xA" (the amperage will be project specific). See example below.
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Real life example
Here we have an example project with the following characteristics:
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Main Service Panel with 200A busbar and 200A main breaker rating (found in the properties panel when the MSP is selected)
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Total array current output of 149.7A (found in the Electrical Design step)
Without PCS, the maximum current output that would be compatible with a main panel tie-in is 32A. Lets review the 120 rule, (busbarA *1.2) - MBR = xA. xA cannot exceed 125% of AC output current. For this example that'd look like: (200A *1.2) - 200A = 40A, 32A * 125% = 40A). Our example project far exceeds this limit.
With PCS, the AC current output is limited to 32A in this case via equipment software, allowing for a main panel tie-in without a main panel upgrade.