SE ENGR. Cheat Sheet 2026

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

1. Which standard defines the commissioning tests and documentation requirements for grid-connected PV systems? → IEC 62446-1
2. An off-grid system needs 10 kWh/day with 2 days of autonomy, 80% DoD, and 90% battery efficiency. What is the minimum nominal battery capacity? → 27.8 kWh
3. Which NEC article specifically addresses large-scale PV electric supply stations of 5 MW or more? → Article 691
4. Which standard is typically used in the US to determine wind and snow design loads on PV array structures? → ASCE 7
5. A 100 kWh battery discharging at a constant 50 kW is operating at what C-rate? → 0.5C
6. Designers commonly limit DC circuit voltage drop to about what level to keep losses low? → 2%
7. Why do backsheets often contain a fluoropolymer layer such as PVF (Tedlar)? → For UV and weathering resistance plus electrical insulation
8. Fixed-tilt arrays in the continental US commonly set row spacing so the array is shade-free during which window? → 9 AM to 3 PM solar time on the winter solstice
9. When sizing PV source circuit conductors, what combined multiplier is typically applied to module short-circuit current (Isc)? → 156%
10. Under NEC 690.12 rapid shutdown, controlled conductors outside the array boundary must be reduced to: → 30 V within 30 seconds
11. Some PV modules that fail toxicity testing may be managed as hazardous waste in the U.S. under which federal law? → Resource Conservation and Recovery Act (RCRA)
12. A module datasheet lists a power tolerance of '0/+5 W'. What does this mean? → Delivered modules will measure at or above nameplate power, by up to 5 W
13. What is the primary design consideration in material properties for Solar Energy Engineering Certification? → Safety, functionality, and compliance with applicable codes
14. What tracking arrangement and focus type does a parabolic trough collector use? → Single-axis tracking with a line focus
15. What is the primary scope of IEEE 1547-2018? → Interconnection and interoperability of DER with electric power systems
16. Which economic mechanism helps support solar energy investment? → Feed-in tariffs
17. What does IRA 'transferability' allow a solar project owner to do? → Sell eligible tax credits to an unrelated taxpayer for cash
18. UL 1741 SB certification of an inverter indicates that it: → Has been tested for the grid-support functions required by IEEE 1547-2018
19. What does DNI stand for in solar resource assessment? → Direct Normal Irradiance
20. A solar project manager identifies a risk that module tariffs may increase costs and buys insurance against it. Which risk response strategy is this? → Transfer
21. Under NEC 690.12, controlled conductors located outside the array boundary must be reduced to what level after rapid shutdown initiation? → 30 V within 30 seconds
22. What role does an inverter play in a solar energy storage system? → Converts DC to AC power
23. Which U.S. law creates a presumption that goods made wholly or partly in Xinjiang were made with forced labor, which affects polysilicon supply chains? → Uyghur Forced Labor Prevention Act (UFLPA)
24. For IR thermography of an operating PV array, what minimum irradiance is generally recommended (per IEC TS 62446-3)? → 600 W/m²
25. Which instrument is specifically designed to measure Direct Normal Irradiance (DNI)? → Pyrheliometer
26. Which practice best verifies that structural fasteners on a racking system were properly tightened during installation QA? → Verification with a calibrated torque wrench and applied torque marks
27. Which document is used by a contractor to formally request clarification of a design ambiguity in the solar plan set? → Request for Information (RFI)
28. What is a typical power temperature coefficient (Pmax) for a crystalline silicon module? → -0.35% to -0.45%/°C
29. What is a key operational concern when using solar salt as a heat transfer fluid? → It freezes at roughly 220-240°C, requiring heat tracing and freeze protection
30. Which project document records identified risks, their probability, impact, owners, and planned responses for a solar build? → Risk register