SIZING PROCEDURE OF SOLAR PANEL FOR ELECTRICAL SYSTEM

SIZING PROCEDURE

Step 1:  Electric load estimation

Step 2:  Battery sizing

Step 3:  Array sizing

Step 4:  Controller specification

Step 5:  Inverter specification

Step 6:  System wiring sizing

Example of sizing procedure on house load

Step 1:  Electric load estimation

 

The house load comprises the following:

1. 10 fluorescent lights (20 watt each), operates 6 hr/day
2. 1 washing machine (400 watt), operates 0.3 hr/day
3. 1 clothes dryer (1000 watt), operates 0.35 hr/day
4. 1 microwave oven (800 watt), operates 0.5 hr/day
5. 1 toaster (1000 watt), operates 0.15 hr/day
6. 1 air conditioner (1000 watt), operates 10 hr/day

 

Each load and the number of daily operating hours should be identified to calculate the average daily electrical energy use in watt-hours, as well as total connected watts.

 

Step 2:  Battery sizing

Step 3:  Array sizing

 

Step 4:  Controller specification

  

 

Step 5:  Inverter specification

 

 

Step 6:  System wiring sizing

 

Wiring information:

 

•       25 ft from the array to controller

•       10 ft from controller to the battery

•       10 ft from batteries to inverter

•       10 ft from inverter to AC load

•       Wire type THWN in conduit, 2% voltage drop

 

1-  Wires from PV combiner box to controller

 

2-  Wires from controller to batteries

 

3-  Wires from batteries to inverter

  

 

4-  System grounding

 

 

5-  Inverter to AC load (AC wire sizing)