How Many Solar Panels to Run an Electric Dryer? (Calculator + Examples)
A typical electric dryer uses about 3.0 kWh per load -- drawing 2,000-5,000W over a 45-60 minute cycle. You need 2 to 3 standard 400W solar panels at 5 peak sun hours to cover one load per day, making the dryer one of the most energy-intensive appliances to power with solar.
Quick answer
A 400W solar panel produces about 1.66 kWh per day at 5 peak sun hours (400W x 5h x 0.83 derate). An electric dryer uses 3.0 kWh per load, so 2 panels (3.32 kWh) cover it with a small buffer.
| Peak Sun Hours | 200W Panels | 300W Panels | 400W Panels |
|---|---|---|---|
| 3 PSH (very cloudy) | 8 | 5 | 4 |
| 4 PSH (cloudy) | 5 | 4 | 3 |
| 5 PSH (US average) | 4 | 3 | 2 |
| 6 PSH (sunny) | 4 | 2 | 2 |
| 7 PSH (desert SW) | 3 | 2 | 2 |
Formula: panels = daily kWh / (panel watts x PSH x 0.83 derate), rounded up.
Electric dryer energy breakdown
Electric dryers are straightforward energy consumers -- the heating element runs at near-full power throughout the cycle, with brief pauses for moisture sensing in newer models.
| Specification | Value |
|---|---|
| Wattage range | 2,000W - 5,000W |
| Average wattage | 3,000W |
| Run time per load | 45 - 60 minutes |
| Loads per day | 1 (average household) |
| Duty cycle | ~85% during cycle |
| Daily energy use | 3.0 kWh |
| Monthly energy use | 90 kWh |
| Yearly energy use | 1,095 kWh |
The heating element accounts for 85-90% of the dryer's energy consumption. The drum motor and controls use only 200-300W. This is why heat pump dryers, which recycle heat instead of generating it from a resistance element, cut energy use by half.
Try the calculator
Adjust the panel wattage and your location's peak sun hours to see exact production numbers for your setup.
Benchmarks: U.S. avg 4.98 · Phoenix 6.54 (highest) · Seattle 3.95 · Anchorage 3.17 (lowest). Above ~5.5 = sunny · 4.5–5.5 = average · below 4.5 = cloudy.
Tap to see sensitivity analysisSensitivity analysis
| Scenario | Value |
|---|---|
| Low (-20%) | 1.3 kWh |
| Expected | 1.6 kWh |
| High (+20%) | 1.9 kWh |
Your daily production scales linearly with both panel wattage and peak sun hours. A 10% change in either input changes your result by 10%.
Running it off-grid
Running an electric dryer off-grid is the most challenging appliance scenario in this guide. The high continuous wattage and 240V requirement make it expensive to set up.
Battery bank sizing:
- Daily consumption: 3.0 kWh
- Autonomy target: 2 days
- Total energy needed: 3.0 x 2 = 6.0 kWh
- At 12V with lithium (LiFePO4) batteries at 80% depth of discharge: 6.0 kWh / 12V / 0.80 = 625 Ah
- At 48V: 156 Ah
Charge controller: Two or three 400W panels (800-1,200W total) need an MPPT charge controller rated for at least 25A at 48V. A 40A controller provides room for future panel additions.
Inverter: This is where electric dryers get expensive off-grid. A standard dryer draws 3,000-5,000W continuously at 240V. You need a split-phase 240V pure sine wave inverter rated at 5,000W or higher. These cost $1,500-$3,000, significantly more than the 1,000-2,000W inverters that handle most other appliances.
Realistic alternatives for off-grid:
- A propane dryer uses only 300-400W of electricity (for the motor and controls) and heats with propane. This drastically simplifies your solar and inverter setup.
- A heat pump dryer uses 1.0-1.5 kWh per load and typically runs on 120V, cutting both panel and inverter requirements in half.
- A clothesline uses zero electricity. In dry, sunny climates this is the most solar-compatible "dryer" there is.
See our battery charging calculator for exact sizing.
Running it grid-tied
Grid-tied is the practical way to solar-power an electric dryer. Two 400W panels produce 3.32 kWh per day, which covers one load (3.0 kWh) with a 0.32 kWh surplus.
Since most people run the dryer in the evening or on weekends, net metering is essential. Your panels bank credits during sunny daytime hours, and the dryer draws against those credits whenever you run it. There is no need for a special inverter or 240V solar setup -- the grid handles the voltage and timing.
For families that do laundry every day, consider adding a third panel. Three panels produce 4.98 kWh per day, giving you a 1.98 kWh buffer that covers cloudy days and occasional double loads.
Energy-saving tips for electric dryers
Reducing dryer energy consumption has a big impact on solar sizing because dryers are such heavy loads:
- Clean the lint filter before every load. A clogged lint filter restricts airflow and can add 10-15 minutes to cycle time. Over a month, that adds up to several extra kWh.
- Use the moisture sensor setting. Timed dry runs the full programmed time regardless. Moisture sensor cycles stop when clothes are dry, often saving 10-20% energy.
- Dry full loads (but do not overstuff). An overpacked dryer tumbles poorly and takes longer. A properly full load is the sweet spot for efficiency.
- Do consecutive loads. The drum and exhaust duct retain heat between loads. Running loads back-to-back means the second load starts warm, saving 5-10% energy.
- Use high spin on the washer first. Extracting more water in the washer means less work for the dryer. High spin can reduce drying time by 10-15 minutes.
- Consider a clothesline for part of the year. Even using a clothesline in summer months cuts your annual dryer energy by 30-40%. That could mean needing 2 panels instead of 3.
- Check the exhaust vent. A kinked, long, or clogged vent restricts airflow and forces the dryer to run longer. Keep the vent run short, straight, and clean.