Solar Flashcards
Simplest type of system to size
Utility interactive
Limitations to size an interactive system? Voltage per nec
Space and budget
Fine balance when sizing a stand alone system
Supply and demand
Loads to consider in sizing a bi-modal system
Critical loads
Solar to generator tarot for a hybrid system?
90%: 10% to 40%:60%
Load an inverter should be rated for?
Largest AC load
Critical design ratio
Load demand vs. instillation ( for each month)
System availability
% of time a system meets load- requirements
In battery bank sizing it demands required capacity
Autonomy
Accessibility
Safe/ practical access to equipment
Cooler arrays
More reliable,last longer and more efficient
Preferred mounting types
Rack and stand off
Tracking system that receives the most solar irradiance
2-axis
Galvanic corrosion
2 metals reacting degrading the lesser metal.
Dead load
Permanent structural load -5to 10 psf
Live load
Temporary structural load – 5 to 10 PSF
Wind load
Structural load that comes from all directions – 25 to 50 PSF
Snow load
Structural load found at the AHJ
Vibration load
Structural load caused by equipment, roads, airports, trains, etc.
Self ballasting advantage
No roofing penetration
Maximum output-ciruit voltage for 1 and 2 family homes
600 volts
Correction factor for maximum pv output voltage per nec
Temperature correction factor.
Correction factor for maximum pv circuit current
125% or 1.25
2 places to fined temperature correction factors array open circuit voltage
Module manufacturers specifications or nec 690.7