NOTES:
1. If the upstream transformer is a Wye winding on the inverter side,
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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