GRADE - Make sure you do not end up with Grade C or lower
EFFICIENCY - Higher the efficiency, you require less area for same output
Efficiency: 11%
Area: 2.5m2
or
25.0 sq.ft
#For a 250W panel
11% 20%
Go for very high efficiencies only if you have significant space constraints
Warranty- Manufacturers offer two type of warranties; linear and standard. Guaranteed output is higher with linear than standard.This can result in generation increase of up to 7%
Additional Value
TEMPERATURE COEFFICIENT - Panel performance decreases in high temperatures.
Consider panels with low temperature coefficient, else you can lose up to 2.5% of generation
Yearly Generation*
Yearly Generation*
25°C 50°C
Anti-PID Feature - Panels without anti-PID(Potential Induced Degradation) may degrade easily and may need replacement within a few years
LOW LIGHT PERFORMANCE - Good performance at low irradiance(sunlight) makes panels perform better in low light conditions.
Can result in a generation increase of up to 7%
Poor panel selection could result in significant generation loss
Ensure the following at the very least in your panels:
And do these too: