How many solar panels does it take to power a house?
For a typical home, **about 15 to 25 standard panels**. That range exists because two homes the same size can use wildly different amounts of electricity, and two homes with the same usage in Arizona and Ohio need different system sizes because of sun. The way to pin down your number is to size the system to your **yearly electricity use**, then divide by the wattage of the panels you choose.
The method in one line: take your annual kWh, divide by your region's yearly production per kW to get the system size in kW, then divide the watts by your panel wattage to get the panel count. The solar panel calculator does this for you, but it is worth understanding each step.
Start with how much electricity you use
Your panel count is driven by **kilowatt-hours (kWh)**, the unit on your power bill, not by your home's square footage. Pull your average monthly kWh from a recent bill and multiply by 12 for the year. The **average US home uses about 10,800 kWh a year**, or roughly 900 kWh a month, but yours could be half or double that depending on climate control, an EV, electric heat, or a pool.
This is why two identical houses can need very different systems: the one with an electric heat pump, an EV, and a hot tub uses far more than the one on gas heat with no EV. Use your real number.
Factor in your sun
The same panels make more power in a sunny place, so your location sets how much each kW of panels produces. As a rule, **1 kW of panels makes about 1,200 to 1,600 kWh per year** in the US, lower in the cloudy north, higher in the sunny southwest. A sunnier home needs **fewer panels** for the same usage because each one produces more.
In practical terms, peak sun hours, the daily average of full-strength sunlight, run from about 4 in the Pacific Northwest and Northeast to 6 in the desert Southwest. That difference alone can change the panel count by a third for the same household.
Do the panel-count math
Here is a worked example. A home using **900 kWh a month** is 10,800 kWh a year. In an average region producing about 1,300 kWh per kW per year, the system size is 10,800 divided by 1,300, or roughly **8.3 kW**. With **400-watt panels**, that is 8,300 watts divided by 400, about **21 panels**.
Change the inputs and the answer moves: the same home in the sunny Southwest might need around 18 panels, while a high-use household with an EV might need 28 or more. Put your real monthly kWh and region into the solar panel calculator to get your own number, plus the roof area it needs.
What changes the number
A few things push the count up or down. **Higher usage** (electric heat, an EV, a pool, central air) needs more panels. **Shade** lowers production, so you may need more panels or microinverters to compensate. **Panel wattage** matters: higher-watt panels mean fewer of them for the same system size. And **roof space** can cap the count, which is where the higher efficiency of monocrystalline panels helps you fit more power in less area.
One more reality for 2026: the 30% federal residential tax credit expired for systems placed in service after December 31, 2025, so sizing the system to your actual usage, rather than overbuilding, matters more than ever for the economics. Weigh ownership against a lease in solar lease vs buy.
Frequently asked questions
How many solar panels do I need for a 2,000 sq ft house?
Square footage is a poor guide; usage is what matters. That said, a typical 2,000 sq ft home using around 1,000 kWh a month often needs roughly 20 to 24 standard panels, or about a 7 to 9 kW system, adjusted for your sun. A same-size home with an EV or electric heat needs more, and one in a sunny region needs fewer. Size it from your actual kWh, not your floor area.
How many solar panels for 1,000 kWh per month?
About 22 to 28 panels in an average-sun region, or roughly a 9 to 11 kW system, using 400-watt panels. The math: 1,000 kWh a month is 12,000 a year, divided by about 1,300 kWh per kW gives roughly 9.2 kW, and 9,200 watts divided by 400 is about 23 panels. Sunnier areas need fewer; cloudier areas need more.
How many solar panels to run a house off-grid?
More than for a grid-tied home, because off-grid you must cover your worst-sun days and store energy in batteries rather than leaning on the grid at night. Off-grid systems are typically oversized by 25 percent or more and paired with a large battery bank, so a home that needs 20 panels grid-tied might need 25 to 30 plus substantial storage to run reliably off-grid.
Can solar panels fully power a house?
Yes, a properly sized grid-tied system can offset all of your yearly electricity, banking summer surplus through net metering to cover winter and night use. Going truly off-grid, with no utility at all, also works but requires oversizing the array and adding battery storage to get through nights and cloudy stretches, which costs considerably more.
How many solar panels does it take to run a refrigerator?
Just one or two. A typical fridge uses about 1 to 2 kWh a day, and a single 400-watt panel produces roughly 1.3 to 2 kWh on an average day, so one or two panels cover it, plus a battery to run it after dark. This is why a small solar generator with a panel can keep a fridge going in an outage.