Before debating kWp, procurement and engineering should read at least a year of factory bills—especially on TOU tariffs.
Separate energy from peak demand
kWh savings and demand charges are different problems. Daytime solar may cut energy while evening peaks stay untouched.
Why TOU changes the model
Not every saved kilowatt-hour has the same value. Estimate savings against the hours your line actually runs.
Give vendors better inputs
Monthly summaries, shift pattern, and large motors that start together beat a vague “cut the bill 30%” target.