NABCEP Cheat Sheet 2026

The 30 highest-yield NABCEP facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the purpose of a blocking diode in a PV string connected to a battery system? → To prevent battery current from flowing backward through the PV string at night
2. In NABCEP practice, what happens when regulations are updated or changed? → Professionals must update their knowledge and practices to meet new requirements
3. In mechanical terms, what is the dead load on a rooftop PV mounting system? → Static weight of the array and mounting hardware
4. When designing a roof-mounted PV system, what is the primary purpose of calculating the roof's dead load capacity? → To ensure the structure can support the added weight of the array
5. NEC Article 705 is relevant to grid-tied solar installations because it covers: → Interconnected electric power production sources and their connection to premises wiring
6. How should panels be handled during transport? → Secured with padding
7. What is the primary purpose of measuring the short-circuit current (Isc) of each source circuit at the combiner during commissioning? → To verify each string is producing and confirm no open-circuit failures
8. When multiple string inverters are installed in a commercial system, each inverter must have: → Its own AC disconnect accessible to utility personnel
9. Which factor should NABCEP professionals consider first when choosing an assessment method? → Appropriateness for the target population
10. A battery-based inverter/charger operating in grid-tied mode with battery backup will typically prioritize loads in which order during a grid outage? → Critical backup loads first, then non-critical loads if battery capacity allows
11. Which professional attribute is most valued in energy storage within the NABCEP field? → Accountability and commitment to standards
12. When should safety checks be performed? → Throughout the process
13. Which NABCEP-recognized tool provides a fish-eye lens photo overlay to assess annual shading at a specific point on a rooftop? → Solar Pathfinder
14. According to NEC 690.31(C), single-conductor cables used as PV wire in exposed outdoor locations shall be: → Listed for use in wet locations and sunlight resistant
15. Which unit measures electrical resistance? → Ohms
16. A module develops a hot spot during commissioning and its surface temperature reads 185°F. What is the FIRST action the technician should take? → De-energize the string using the combiner disconnect, then assess the module
17. What does 'round-trip efficiency' measure in an energy storage system? → The ratio of energy delivered by the battery to energy required to charge it
18. What is the PRIMARY purpose of obtaining NABCEP certification in North American Board of Certified Energy Practitioners Solar? → To demonstrate verified competency and adherence to professional standards
19. A site assessment reveals that a proposed array location receives significant shading from 9 AM to 11 AM in December. What is the MOST appropriate next step? → Use a solar pathfinder or software to quantify annual shading losses
20. A battery-based inverter/charger is classified as a 'multimode inverter.' What capability does this describe? → Functioning in both grid-tied and off-grid modes
21. What is the minimum height clearance required for a service-entrance conductor (SE cable) above a roof surface per NEC 230.24? → 18 inches
22. When assessing a flat commercial roof for a ballasted solar array, which factor is MOST critical to evaluate first? → Structural dead load capacity
23. When a rooftop PV array is installed on a building with a hip roof, which code document specifies the required setback from the ridge? → IFC Section 605 / local fire codes
24. What document must be executed between a solar system owner and the utility before a grid-tied PV system can be legally energized? → Interconnection Agreement
25. What converts DC to AC in a solar system? → Inverter
26. Which regulatory requirement is UNIVERSAL across all North American Board of Certified Energy Practitioners Solar practice settings? → Maintaining current certification and meeting continuing education requirements
27. In an AC-coupled energy storage system, where does the battery inverter connect? → On the AC bus, parallel with the solar inverter and loads
28. Which professional attribute is most valued in solar pv fundamentals within the NABCEP field? → Accountability and commitment to standards
29. What is the maximum DC voltage permitted for commercial and utility-scale PV systems under NEC Article 690? → 1500V
30. What does the commissioning step of verifying 'anti-islanding' confirm in a grid-tied inverter? → The inverter disconnects from the grid during a utility outage