Installation and Operation Guide SOLECTRIA® PVI 25TL-208, PVI 50TL-480 and PVI 60TL-480
DOCR-071030-A (10/7/2022)
Page 52 of 131
Check with your local electric utility before selecting a grid profile. The system must comply with National
Electrical Code ANSI/NFPA 70 and with all local rules and safety regulations before the inverter can be
operated.
Yaskawa Solectria Solar PVI line three-phase transformerless inverters prefer a wye configured service with solidly
grounded neutral. When needed, a floating WYE or floating delta service is permissible. Please note that when
pairing these inverters with a floating WYE or floating delta service, the inverter can only provide DC ground fault
detection. It is the customer’s responsibility to provide AC ground fault detection external to the inverter to comply
with NEC 250.21. Table 3-10 shows the allowable inverter side transformer winding configurations.
Table 3-9 Transformer Specifications (Inverter facing)
INVERTER
TRANSFORMER WINDING (INVERTER SIDE)
WYE
Floating*
WYE
Grounded
Delta
Floating*
Delta
Grounded
PVI 25TL-208
YES
YES
YES*
NO
PVI 50TL-480
PVI 60TL-480
YES
YES
YES*
NO
* Customer provided external Ground Fault detection on AC side is required to comply with NEC 250.21 code. Only DC Ground Fault detection
provided by the inverter with floating WYE or floating Delta interconnection configurations.
Figure 3-30 Permitted Transformer Configurations
