STEP 3: Size Your System for Off Grid
How big should your Off-Grid system be?
If you are moving from a utility-connected home in the ‘burbs’ to an off-grid home in the boonies, you will have the opportunity (perhaps necessity) of downsizing your electricity usage. In order to calculate how large your home power system needs to be, run the solar panel calculator below TWICE. Compare and adjust your plans according to your budget and lifestyle.
- Run the System Sizing Calculator first with numbers from your current electricity usage to get your initial solar panel calculation.
- Then run it with figures from working through the Load Evaluation Calculator, (PDF ) based on the energy efficient lighting and energy efficient appliances you will choose for your new off-grid home.
- Use our Appliance Electrical Consumption Table for average appliance electrical usages.
- Once you have a good idea of what size system you are going to need browse our Off Grid Systems. Or call us and we can design any size system to fit your needs.
Four Easy Steps to Design Your Own System
Off-Grid Solar Panel Calculator
This provides a rough estimate of your solar needs. For a more precise calculation, please give us a call at 1-800-472-1142.
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.
SUN HOURS/DAY ZONE 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.