What Does “System Size” Mean?
System size is the total DC power of all panels combined.
Formula:
System Size (kW) = Number of Panels × Panel Wattage ÷ 1000
Example:
10 panels × 400W = 4,000W = 4.0 kW system
Step-by-Step: How to Size a System (Sales Method)
STEP 1: Understand the Goal
- Reduce bill?
- Offset 70–90%?
- Add battery backup?
- EV now or later?
Knowledge Check
System size is calculated using: