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When the output of the inverter is connected to the grid, an external AC
circuit breaker is required to be installed to safely disconnect the inverter
from the grid should an overcurrent event occur. The minimum size breaker
is determined by NEC calculations. The internal temperature of the AC
Panel must be considered and appropriate derate applied to prevent
nuisance tripping.
Table 3-11 Specification of AC breaker selection
The SCH100KTL-DO/US-600 and SCH125KTL-DO/US-600 inverters
operate at 600VAC/Wye output, while the SCH100KTL-DO/US-480
inverters operate at 480VAC/Wye output. If another voltage/configuration
is required, a transformer may be necessary.
Up to 30 inverters may be connected in parallel for use with a single transformer.
NOTICE:
Transformer Configurations:
3W Wye and 4W Grounded Wye is recommended.
Floating 3W Wye 3W Delta Configuration is acceptable but required
external GFCI.
The presence of a Grounding Transformer or YG : d causes voltage
regeneration – Loss of Single Phase must be mitigated external to
Inverter due to regenerated voltage present at inverter AC terminals.
Open and Grounded Delta configurations are not acceptable.
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