Inverters/Isolation Transformer Combination Equipment Sample Clauses

Inverters/Isolation Transformer Combination Equipment. In addition to being listed to UL 1741, inverters must also be unused and of recent manufacture and listed on the CEC current list of Eligible Renewable Equipment. Inverters must be sized to properly accommodate the DC input from the PV panels under all expected electrical, thermal, and other operational conditions and be designed for normal unattended operation. The inverter must contain all self-protection features as stated in IEEE 929 including over and under voltage and frequency safeguards. An integral, anti-islanding protection scheme shall prevent the inverter from feeding power to the utility grid in the event of a utility outage. Inverter efficiency shall be rated at greater than or equal to 95%. The inverter shall include provisions for automatic operation including start up, shut down, self-diagnosis, and fault detection. Inverter shut off and reset toggle switches shall be provided. The DC array capacity to AC inverter capacity shall not exceed 115%. AC current distortion at rated power must be less than 5% Total Harmonic Distortion (THD) at all power output loadings. The inverters shall be interconnected to the customer’s electrical panel in a manner that meets code and utility requirements. The inverters shall be housed in an appropriately shaded, waterproof and dust proof enclosure, or in a building. The inverters shall have provisions to prevent moisture condensation and entrance of rodents into air intake or exhaust ports. The inverter enclosure shall take into consideration the effects of direct sunlight and extreme weather such that the inverters are appropriately shielded from the elements. The inverter enclosure should be well ventilated so that the inverters operate safely at or near their maximum power point (MPP). The following specific codes and standards shall apply to the inverter installation and operation: - ANSI /IEEE 519 1981 Guide for Harmonic Control of Static Power Controllers. - ANSI Test Code C57, 12.91 for Factory Tests of Dry Type Transformers.
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