How each house performs vs. community average (positive = above avg)
Percentage change from previous month
Same month comparison across years
Track kWh/kWp over years (degradation analysis)
Based on production patterns (~1000 kWh/kWp/year)
Lower CV = more consistent production (Coefficient of Variation)
Months with unusually high output (>1.5 std from mean)
Months with unusually low output (>1.5 std below mean)