Solar Recharge Time Calculator: How Long to Refill a Power Station From the Sun
The box says “full in 2 hours of sun.” The 200W panel makes 130W at the campsite, the station only takes what its charge controller allows, and the sun is only strong for four hours. Pick a station and a panel and see the real number: hours of peak sun to full, days at your location's sun, and whether a day's harvest covers what you draw at night.
Panel output is rated watts × 0.65, the planning factor published across our solar guides; the station's max solar input is the manufacturer's ceiling. Nothing here is measured on a bench. Method: how we research.
1. Power station
2. Solar panel
3. Sun
0.65 is the planning baseline. Cold, clear, tracked panels reach 0.75–0.80; hot, hazy, fixed-flat panels drop to 0.55–0.60.
4. What you use per day (optional)
Anker SOLIX C1000 Gen 2 · 1 × Anker SOLIX PS200 Solar Panel · 4.5 peak sun hrs/day
7.9 hrs of peak sun to full
200W rated × 0.65 = 130W in the field. 1024Wh ÷ 130W = 7.9 hrs from empty — expect 10–20% longer, because the charge controller tapers current near full.
Days to full at 4.5 hrs/day
2 days
Harvest per day
585Wh
vs 500Wh daily use
+85Wh
Headroom: this station accepts 600W, so it would take about 5 of these panels (at × 0.65) to hit the ceiling. Until then, every panel added shortens the recharge.
Watts only. Whether the panels are inside the station's MPPT voltage window is a separate check — see why solar generators charge slower than advertised.
Go deeper:
- How many solar panels do I need? — the sizing formula, worked for 300, 500, and 800Wh days at 4 and 6 sun hours.
- Solar panel STC rating vs real output — where the 0.65 comes from and when to use 0.55 or 0.80 instead.
- Why your solar generator charges slower than advertised — MPPT voltage windows and amperage caps, the constraints this calculator can't see.
- Solar generator bundle vs buying separately — whether the panel in the box is the panel you'd choose.