Grid-Tie Calculator: Size Your System for Grid-Tie
This solar panel calculation will give you an approximate system wattage so that you can get an idea of cost and components needed for your system. In order to
calculate how large your home power system needs to be, run the Grid-Tie sizing calculator below.
- Make sure you have the average kWh usage from Step One.
- Decide what percentage of power you want to generate.
- Get the daily sun hours for your building location.
- Calculate your system size.
- Once you have 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. 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 Grid-Tie ballpark cost table.
Last updated: 04/22/2019
|System size (kW)||Estimated Monthly Output (kWh)||Example panel configuration||Approximate Price Range (before 30% federal tax credit)|
|1.12 kW||151 kWh/mo||4 × 280 W||$2000|
|1.68 kW||274 kWh/mo||6 × 280 W||$3200|
|2.24 kW||415 kWh/mo||8 × 280 W||$4400|
|3.36 kW||549 kWh/mo||12 × 280 W||$4900|
|4.2 kW||686 kWh/mo||15 × 280 W||$5900|
|4.48 kW||830 kWh/mo||16 × 280 W||$7100|
|6.3 kW||1037 kWh/mo||20 × 315 W||$8800|
|6.72 kW||1098 kWh/mo||24 × 280 W||$8500|
|7.56 kW||1245 kWh/mo||24 × 315 W||$10200|
|8.4 kW||1361 kWh/mo||30 × 280 W||$11300|
|8.4 kW||1513 kWh/mo||30 × 280 W||$14100|
|8.96 kW||1647 kWh/mo||32 × 280 W||$13800|
|10.08 kW||1815 kWh/mo||36 × 280 W||$14000|
|12.6 kW||1891 kWh/mo||45 × 280 W||$18100|
|12.6 kW||2074 kWh/mo||40 × 315 W||$16800|
|14 kW||2269 kWh/mo||50 × 280 W||$17300|
|15.75 kW||2593 kWh/mo||50 × 315 W||$23000|
|20.1 kW||2745 kWh/mo||60 × 335 W||$24200|
|16.8 kW||3025 kWh/mo||60 × 280 W||$23400|
|25.2 kW||3485 kWh/mo||80 × 315 W||$29600|
|26.8 kW||3660 kWh/mo||80 × 335 W||$31200|
|30 kW||4148 kWh/mo||80 × 375 W||$38500|
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 energy needs.
Take your calculated numbers and explore the Grid-Tied Systems.
Or give us a call at 1-800-472-1142. We are here to help!