Solar System Calculator


Off-Grid System Sizing Calculator

Wholesale Solar Off-Grid 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.)


Use the Actual Watt Hours per day at the end of your Load Evaluation Calculator

multiply results by 30 (for monthly total) and divided by 1000 (to convert to KwHours).


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. Hours
Minimum System Size:

For 30 Kyocera 140-watt solar panels to produce 4,200 watts..... 4,200 divided by 140(watts per panel) = number of solar panels needed.

NOTE: These figures are approximate and do not take into account the variable efficiency ratings of solar panels and off grid inverters. Please work with experienced Wholesale Solar staff to design a system which fits within your budget and can be expanded as needed.

How Many Sun Hours a Day Do You Get?

The hourly figure indicates the average (over the course of the year) amount of 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.

Average Annual Solar Map South Africa