51
NOTES:
1. If the upstream transformer is a WYE on the inverter winding, the
Neutral must be grounded or additional ground fault detection must be
installed.. The Neutral on the Utility Side (H0) and Inverter Side (X0)
may be connected internally and brought out as one terminal in the LV
compartment and labeled (H0X0).
2. Transformer short-circuit impedance (Z%) should be less than 6%.
3. The transformer VA rating should be at least 100% of the sum of the
connected inverter VA ratings.
4. CPS recommends the transformer VA rating be selected based on
IEEE C57.159-2016 Guide on Transformers for application in
Distributed Photovoltaic (DPV) Power Generation Systems. It is
the responsibility of the system designer to determine and take in
account the reliability of the transformer or other system parameters.
5. The transformer does not require a static shield.
6. The maximum number of inverters connected to a single transformer
is 32.
7. The recommended maximum voltage-drop on the Inverter to Point of
Common Coupling (to the grid) is 2% at full load – including conductor
temperature considerations. Voltage drop greater than 2% may require
changing the transformer tap or as a last resort adjusting the
GridMaxVolt trip point settings.
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