How solar recharge time is calculated
A solar panel's rating (e.g. 200 W) is measured in lab conditions. In the real world you'll get about 70–80% because of heat, angle, dust and controller losses. We use 75%. The number of hours of strong sunlight (“peak sun hours”) depends on where you are.
Remember the station's maximum solar input: connecting 800 W of panels to a unit that accepts 220 W won't charge it faster.
Recharge time by power station and panel size
Hours of full sun from 0 to 100%. * = limited by the station's maximum solar input.
| Power station | 100 W panel | 200 W panel | 400 W panel | 800 W panel |
|---|---|---|---|---|
| EcoFlow RIVER 3 Plus (286 Wh, max 220 W in) | 3.8 h | 1.9 h | 1.7 h* | 1.7 h* |
| Jackery Explorer 300 v2 (288 Wh, max 100 W in) | 3.8 h | 3.8 h* | 3.8 h* | 3.8 h* |
| EcoFlow RIVER 2 Pro (768 Wh, max 220 W in) | 10.2 h | 5.1 h | 4.7 h* | 4.7 h* |
| EcoFlow DELTA 3 (1,024 Wh, max 500 W in) | 13.7 h | 6.8 h | 3.4 h | 2.7 h* |
| Jackery Explorer 1000 v2 (1,070 Wh, max 400 W in) | 14.3 h | 7.1 h | 3.6 h | 3.6 h* |
| EcoFlow DELTA 2 Max (2,048 Wh, max 1,000 W in) | 27.3 h | 13.7 h | 6.8 h | 3.4 h |
| EcoFlow DELTA Pro (3,600 Wh, max 1,600 W in) | 2 days | 24 h | 12 h | 6 h |
Peak sun hours by state
| State | Peak sun hours/day | Daily output of a 200 W panel |
|---|---|---|
| Arizona | 6.5 | ≈ 975 Wh |
| Nevada | 6.2 | ≈ 930 Wh |
| California | 5.8 | ≈ 870 Wh |
| Texas | 5.3 | ≈ 795 Wh |
| Florida | 5.2 | ≈ 780 Wh |
| Colorado | 5.5 | ≈ 825 Wh |
| Georgia | 4.9 | ≈ 735 Wh |
| North Carolina | 4.8 | ≈ 720 Wh |
| Illinois | 4.4 | ≈ 660 Wh |
| New York | 4 | ≈ 600 Wh |
| Michigan | 4 | ≈ 600 Wh |
| Washington | 3.6 | ≈ 540 Wh |
Annual averages. Expect 30–50% more in summer and 40–60% less in winter, especially in northern states.
Tips for faster solar charging
- Angle panels toward the sun and re-aim them 2–3 times a day: up to 30% more energy than lying flat.
- Keep panels cool and shade-free; even a small shadow can cut output dramatically.
- Check the connector (XT60, Anderson, DC7909, DC8020) and the open-circuit voltage before buying third-party panels.
- Use two inputs if your station supports it (e.g. solar + car charging).
Frequently asked questions
How many solar panels do I need to charge a 1000Wh power station?
With 5 peak sun hours you need about 270 W of panels to recharge 1,000 Wh in one day (1,000 ÷ (5 × 0.75)). A 200 W panel takes about 6.7 hours of full sun, a 400 W panel about 3.3 hours if the station accepts 400 W.
Can a 100W solar panel charge a power station?
Yes, but slowly: about 75 W real output, so a 300 Wh unit takes ~4 hours of full sun and a 1,000 Wh unit more than 13 hours (2–3 days).
Can I use any brand of solar panel?
Usually yes, if the voltage is within the station's solar input range and you have the right adapter. Same-brand panels are plug-and-play.
Do solar panels work on cloudy days?
They still produce, but typically only 10–25% of their rating under heavy clouds.