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Concerned about quality?  Call 1-800-472-1142 M-F 8 am to 5 pm PST, email us at sales@wholesalesolar.com, or Request a Quote
Call 1-800-472-1142 M-F 8 to 5 PST,
email sales@wholesalesolar.com, or Request a Quote

STEP 3: Size Your System for Grid-Tied Solar

How big should your Grid-Intertied home power system be?

This calculator will give you an approximate system wattage so that you can get an idea of cost and components needed for your system.

Please work with experienced Wholesale Solar staff to design a system which fits within your budget and can be expanded as needed.

View our Grid Tie Systems

Video: FYI - Grid-Tie Inverter System Options



Grid-Tie System Sizing Calculator

Wholesale Solar Grid-Tie System Size Calculator
1. How much electricity do you use each month?
Look at your electric bills from the past 6 months (or less) and find the average number of Kilowatt Hours (KwH) per month. Put this number in the space to the right.
2. What percentage of your house/business power do you want to generate with solar power? If you want to produce 100% of your electricity, put 100.
3. How many Peak Sun Hours do you get per day? Look at the Solar Map below to find this number.
Minimum System Size:

Approximate Solar Panel Wattage:

Approximate Number of Solar Panels Needed:



SUN HOURS/DAY ZONE MAP
solar insolation map
How Many Sun Hours a Day Do You Get?

Zone 1      6 hours
Zone 2      5.5 hours
Zone 3      5 hours
Zone 4      4.5 hours
Zone 5      4.2 hours
Zone 6      3.5 hours

The hourly figure indicates the average (over the course of the year) amount of insolation (full sun hours) for these zones.  These figures are based on the yearly average; consequently, systems based on these figures will provide more power in summer and less in winter.  Winter figures for daily solar gain may be from 25% to 50% LESS than these average figures.


System Sizing Based on Sun Hours
System Rating
1kW
2kW
3kW
4kW
5kW
6kW
7kW
8kW
10kW
6.5 Sun Hrs
150
300
450
600
750
900
1,050
1,200
1,500
6 Sun Hrs
140
280
420
560
700
840
980
1,120
1,400
5.5 Sun Hrs
130
260
390
520
650
780
910
1,040
1,300
5 Sun Hrs
120
240
360
480
600
720
840
960
1,200
4.5 Sun Hrs
105
210
315
420
525
630
735
840
1,050
4 Sun Hrs
95
190
285
380
475
570
665
760
950
3.5 Sun Hrs
80
160
240
320
400
480
560
640
800