Off-Grid Calculator: Size Your System for Off-Grid
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 Off-Grid sizing calculator below.
- Run the System Sizing Calculator with 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.
- Decide what percentage of power you want to generate.
- Get the daily sun hours for your building location.
- Calculate your system size.
- Once you calculate your system size, write it down. You will need this for Step Four.
You can also explore some of our pre-designed systems to get a ballpark idea of what your system might cost.
* For 20
Astronergy 270-watt solar panels to produce 5,400 watts..... 5,400 divided by 270(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.
To get a ballpark idea of what your system might cost:
Click the button on the right to view our off-grid ballpark cost table.
Last updated: 04/25/2018
|System size (kW)||Daily Production Estimate||Example panel configuration||Approximate Price Range (before 30% federal tax credit)|
|1.08 kW||Summer 4.5 kWh|
Winter 2.0 kWh
|4 × 270 W||$7,200|
|1.62 kW||Summer 10.5 kWh|
Winter 5.0 kWh
|6 × 270 W||$9,900 - $14,900|
|3.24 kW||Summer 14.5 kWh|
Winter 7.0 kWh
|12 × 270 W||$12,500 - $22,900|
|4.05 kW||Summer 18.0 kWh|
Winter 9.0 kWh
|15 × 270 W||$13,500 - $23,900|
|4.86 kW||Summer 21.5 kWh|
Winter 10.5 kWh
|18 × 270 W||$15,800 - $26,200|
|6.48 kW||Summer 29.0 kWh|
Winter 14.5 kWh
|24 × 270 W||$24,100 - $45,100|
|7.08 kW||Summer 31.5 kWh|
Winter 15.5 kWh
|24 × 295 W||$26,100 - $47,100|
|8.1 kW||Summer 36.0 kWh|
Winter 18.0 kWh
|30 × 270 W||$25,500 - $46,500|
|8.85 kW||Summer 39.5 kWh|
Winter 19.5 kWh
|30 × 295 W||$28,000 - $49,000|
|9.72 kW||Summer 43.5 kWh|
Winter 21.5 kWh
|36 × 270 W||$32,300 - $54,800|
|12.15 kW||Summer 54.5 kWh|
Winter 27.0 kWh
|45 × 270 W||$41,500 - $44,100|
|13.28 kW||Summer 59.5 kWh|
Winter 29.5 kWh
|45 × 295 W||$45,200 - $47,800|
|14.58 kW||Summer 65.5 kWh|
Winter 32.5 kWh
|54 × 270 W||$44,300 - $46,900|
|15.93 kW||Summer 71.5 kWh|
Winter 35.5 kWh
|54 × 295 W||$48,800 - $51,400|
These figures are based on complete solar power systems that Wholesale Solar sells. Prices are approximate. Prices do not include freight, tax, or installation.
Why are smaller systems sometimes more expensive than larger ones? Because higher-efficiency panels cost more. For example, to get a 10 kW system, you can either use 35 285W panels or 39 260W panels. Even though you need more 260W panels (they are less efficient), economies of scale actually make them more affordable. So when would you want to use higher-efficieny panels? Only when you're limited on roof/ground space and need to squeeze the most power out of every available square foot. In other words, more efficient panels cost more but can generate more power per square area. If you're not limited by space, we suggest you go with the best price per watt instead.
Click the button on the right to check out our pre-designed systems that closely match your current calculated off-grid needs. *
* Pricing on these systems does NOT include batteries.
Take your calculated numbers and explore the Off-Grid Systems.
Or give us a call at 1-800-472-1142. We are here to help!