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Enphase Storage design certification training
Which component of the Ensemble system detects a grid failure? A. Envoy B. Enpower C. Encharge - ANS B. Enpower True or false: PV systems with Energy storage but without backup power do not require Enpower. - ANS True Where do the hot conductors between Encharge and Enpower terminate? A. In the IQ Combiner box B. At the DER (distributed energy resource) input terminals C. On the Encharge circuit breaker terminals D. On the PV circuit breaker terminals Clear my choice - ANS B. At the DER (distributed energy resource) input terminals What is the maximum amount of PV and storage that can be connected to the Enpower smart switch? A. 80A of PV and 80A of storage for a total of 160A B. 80A of PV or 80A of storage for a total of 80A C. 40A of PV and 40A of storage for a total of 80A D. 0A, PV and Storage is landed in a backup loads panel - ANS A. 80A of PV and 80A of storage for a total of 160A Do we need to install an additional service disconnect if the Enpower main service breaker has been installed as the main service disconnect? A. No, it is not necessary to install an additional disconnect B. It depends on the use case C. Yes, it has to be redundant and serve as a rapid shutdown initiation device - ANS A. No, it is not necessary to install an additional disconnect
Why does Enpower need a Neutral Forming Transformer to operate during the grid outage? A. Because NEC 2017 requires a transformer to have reference to Neutral B. Because Encharge batteries operate 240 VAC line to line and split phase power systems require a neutral C. Because when the grid is down the micro inverters operate on 120 VA - ANS B. Because Encharge batteries operate 240 VAC line to line and split phase power systems require a neutral The above system was initially estimated to require three Encharge 3 equivalent to one Encharge 10 and no soft starter. After the site survey, they found that the largest single load in the backup load center, is going to be a 3 kVA electric motor with a start current of 32 Amps at 240 VAC for 3 seconds. Is the estimated size of one Encharge 10 going to be enough to comply with NEC 2017 710.15 (A) without using a soft starter? A. Yes, one Encharge 10 will comply B. One Encharge 10 is ok because NEC 2017 710.5(A) only applies to whole home backup C. No, it requires a minimum of 4 Encharge 3 to comply - ANS C. No, it requires a minimum of 4 Encharge 3 to comply For partial home backup the guidelines in the Ensemble planning guide recommend the size of the energy storage system to be the largest of: --> Largest single load in the essential loads subpanel --> Result of load analysis of power, surge and reactive power For whole home backup what is added to the partial home backup list of items to extract the largest? A. No items are added, the guidelines for whole home are the same as for partial home backup B. Soft starters C. Two Encharge 3 D. Two Encharge 10 - ANS D. Two Encharge 10
When will the IQ8 microinverters supply power to the protected loads panel if the grid is down? A. During the day if the generator stops. B. IQ8 microinverters are grid forming so they will operate day and night with or without generator. C. Only during sun-hours and enough solar irradiance for the microinverter to operate. D. During sun-hours if the generator is running to provide the voltage reference. - ANS C. Only during sun-hours and enough solar irradiance for the microinverter to operate. True or false: This system will supply power during grid outages during sun-hours or at night because the PV array power is larger than 3.5 times the largest single load power.
- ANS False Which Enpower breakers must be ordered separately, be specified in the single line diagram and be listed in the bill of materials? A. All except 6 B. 1 and 2 C. All but 4 and 5 because they are identical and preinstalled D. 4 and 5 - ANS A. All except 6 What electrical safety reason is involved in the requirement that Encharge and Generator breakers must have a hold down kit to comply with NEC 2017 710.15(E)? A. Both breakers are two-pole 240 Volts and a secondary power source B. ESS and Generators are considered high voltage C. When the grid is down, the Encharge breaker will be energized, and the Generator breaker can also be energized if Enpower starts the generator to supplement energy demand. The hold down kit prevents exposure to electric shock and arc flash if a person accidentally attempts to remove the breakers during a grid outage - ANS C. When the grid is down, the Encharge breaker will be energized, and the Generator breaker can also be energized if Enpower starts the generator to supplement energy demand. The hold down kit prevents exposure to electric shock and arc flash if a person accidentally attempts to remove the breakers during a grid outage Which Enpower breaker can be used as PV rapid shutdown initiation device?
A. PV AC combiner breaker B. Only an external breaker can be a rapid shutdown initiation device C. Encharge breaker - ANS A. PV AC combiner breaker Main and load CSR breakers have identical specifications with ratings ranging between 100 Amps and 200 Amps. What does the designer must do if the required rating for the load breaker is below 100 Amps? A. Does not specify any load breaker in the single line diagram and on the bill of materials B. Switch from partial home backup to whole home backup C. Does not specify any load breaker inside Enpower and specifies a regular breaker inside the essential load center as OCPD of the load feeder in the single line diagram and on the bill of materials - ANS C. Does not specify any load breaker inside Enpower and specifies a regular breaker inside the essential load center as OCPD of the load feeder in the single line diagram and on the bill of materials True or false: This system was designed as whole home backup with a 200 Amps CSR breaker as the system overcurrent protection device and service disconnecting means. - ANS True Regarding breakers, is this system correctly designed and code compliant? A. Yes, it is correctly designed and code compliant B. No, it is incorrect. It should have a main breaker inside Enpower and no-load breaker C. No, it is incorrect. It should have load breaker and no main breaker - ANS A. Yes, it is correctly designed and code compliant Why do the PV and Encharge breakers have a maximum rating of 80 Amps each? A. The system will never have more than 80 Amps of PV or 80 Amps of Encharge B. There are no Enpower 2-pole breakers in the market with a rating higher than 80 Amps C. To make Ensemble comply with the 120% rule D. It is the maximum ampacity of Enpower common busbar - ANS D. It is the maximum ampacity of Enpower common busbar
A. Encharge, #14 AWG B. Encharge, #12 AWG C. PV AC, #10 AWG D. PV AC, #12 AWG - ANS A. Encharge, #14 AWG D. PV AC, #12 AWG Encharge 10 has three AC disconnects, one on each Encharge 3 base unit and they are accessible without having to use tools. Why does the jurisdiction require a separate AC disconnect between Encharge and Enpower? A. The distance between Encharge and Enpower on straight line is 10 feet and there is a solid obstruction between them B. There is no Encharge breaker on Enpower C. Encharge breaker in Enpower is undersized D. Encharge 10 does not have a single disconnect to shut down all three Encharge 3 base units at the same time - ANS A. The distance between Encharge and Enpower on straight line is 10 feet and there is a solid obstruction between them True or false: The above design complies with the 120% rule using either a 150 Amp or a 200 Amp main breaker. - ANS True The designer specified the PV breaker inside Enpower as the rapid shutdown initiation device. Do the two breakers in the PV AC combiner also comply with Article 690.12 of NEC 2017 as an approved alternative location for rapid shutdown initiation device? A. No, only a separate AC disconnect between the AC combiner and Enpower is a code-compliant alternative to the PV breaker inside Enpower B. Yes, the breakers in AC combiners comply with Article 690.12 of NEC 2017 as an approved alternative location for rapid shutdown initiation device C. No, the article applies only to the IQ combiner branch circuit breakers - ANS B. Yes, the breakers in AC combiners comply with Article 690.12 of NEC 2017 as an approved alternative location for rapid shutdown initiation device What should be the minimum conductor size of the Encharge feeder for 90°C THWN-2? A. #8 AWG
B. #12 AWG
C. #10 AWG - ANS B. #12 AWG
Which note number corresponds to the Ensemble components in charge of sensing the energy usage of the whole home and how many components are there on the note? A. Note 7, Two components B. Note 2, Two components C. Note 1, One component - ANS A. Note 7, Two components In this single line diagram, the PV rapid shutdown initiation device is shown as a separate AC disconnect. The AHJ notified the installation company to move the functionality of PV rapid shutdown initiation device to the breakers labeled as note 6 because there is not a location for the a separate AC disconnect with good visibility for the fire fighters. What is the correct action on the single line diagram? A. Add a label of PV shutdown initiation device to the breakers labeled as 6 showing that there will be two PV shutdown initiation devices B. Delete the AC disconnect and move the label of PV rapid shutdown to the breakers labeled as 6 C. Leave the AC disconnect the way it is and move the label of PV rapid shutdown to the breakers labeled as 6 D. Do not make any change to the single line diagram - ANS B. Delete the AC disconnect and move the label of PV rapid shutdown to the breakers labeled as 6 True or false: Note 1 indicates that this is a single production CT for two branch circuits and includes L1 conductors only but if we had four branch circuits instead of just two, we would need to add one more CT for the L2 conductors of the two additional branch circuits. - ANS False Encharge 10 has three DC switches, one on each Encharge 3 base unit and they are accessible without having to use tools. Why does the jurisdiction require a separate DC Switches between Encharge and Enpower? A. The distance between Encharge and Enpower on straight line is 10 feet and there is a solid obstruction between them B. There is no Encharge breaker on Enpower C. Encharge breaker in Enpower is undersized
