EcoFlow

400W Portable Solar Panel

The EcoFlow 400W Portable Solar Panel is rated 400 W; expect about 300 W in real sun. It fits 13 of the 15 power stations we track by voltage (0 plug in directly, 13 need an adapter cable). On its own it recharges the EcoFlow DELTA 3 Classic (1,024 Wh) in about 3.4 peak-sun hours, roughly 0.6 days in Dallas, TX.

Which power stations it charges, and how fast

How these are calculated: a panel fits when its open-circuit voltage is inside the station's solar input range; a different plug only needs an adapter cable (brand panels often include one), but no adapter can fix a voltage mismatch. Real-world watts = the panel's rating, capped by the input's current limit × the panel's voltage at max power and by the station's maximum solar input, × 75%. Peak-sun hours to full = the station's rated capacity ÷ real-world watts (charging fills the whole battery; "usable" capacity is what later comes out at the AC outlets). Days = those hours ÷ the city's peak sun hours per day, for the annual average and for December, the darkest month (Phoenix, AZ: 6.57 / 5.43 h; Dallas, TX: 5.4 / 4.37 h; Seattle, WA: 3.82 / 1.59 h). Open-circuit voltage rises in cold weather, so leave headroom below the station's maximum when wiring panels in series. See the methodology.