TamilBTC

1. Solar Plant Capacity Formula

This helps you decide if a customer needs a 3kW, 5kW, or 10kW system.

Step A: Daily Units Needed

Step B: System Size Calculation

In India (specifically Tamil Nadu), 1kW of solar typically generates 4 to 5 units per day

Example: If a customer uses 450 units a month:

• Daily usage: 450 / 30 = 15 units$

• System size: 15 / 4.5 = 3.33 kW$ (Recommend a 3kW or 4kW system)

2. Solar Panel Quantity Formula

Once you have the kW size, calculate the number of panels based on their wattage (e.g., 550Wp Bi-facial panels).

Example: For a 3kW system using 550W panels:

• (3 * 1000) / 550 = 5.45 (Use 6 panels)

3. Battery Backup Time Formula

Essential for your Hybrid Inverter customers at RS ELECTRIC.

(Note: Use 0.8 for lead-acid efficiency or 0.95 for Lithium-ion)

Example: A 150Ah/12V battery running a 300W load (fans/lights):

• $(150 * 12 * 0.8) / 300 = 4.8 Hours$

4. Roof Space Requirement

A critical “fact check” before you sign a contract.

• Standard Rule: 1kW of solar requires approx 80 – 100 sq. ft. of shadow-free area.

• Formula: Total Area Needed = SystemSize (kW) * 100 sq. ft.$

Quick Reference Table for your Clients