Will the EcoFlow 400W Portable Solar Panel work with the EcoFlow DELTA Pro Ultra?
Yes. One EcoFlow 400W Portable Solar Panel works with the EcoFlow DELTA Pro Ultra: about 52.6 V on a 20°F morning against the station's 150 V limit, and about 400 W in full sun. Two panels: works (2 panels in series on High-PV), about 800 W.
Works
1 x 400W Portable Solar Panel into the DELTA Pro Ultra (1 panel on Low-PV) stays inside 30 to 150 V and under 15 A, even at 20F.
- Use the solar charging cable that came with the station (MC4 on the panel side).
400 W, open-circuit 48 V, short-circuit 11 A, working 41 V / 9.8 A. Unconfirmed Panel details
EcoFlow DELTA Pro UltraSolar input High-PV: 80 to 450 V; Low-PV: 30 to 150 V, 5600 W max. Brand page Station details
Change the count or temperatureTwo panels: every way to wire them
| Wiring | Input | Volts at 20F | Amps | Watts | Verdict |
|---|---|---|---|---|---|
| 2 panels in series on High-PV Best option | High-PV | 105.1 | 9.8 | 800 | Works |
| 2 panels in series on Low-PV | Low-PV | 105.1 | 9.8 | 800 | Works |
| 2 panels in parallel on Low-PV The panels can push 19.6A but this input takes 15A, so the station caps it. Safe, you just lose some watts. | Low-PV | 52.6 | 19.6 | 615 | Works |
| 1 panel on High-PV + 1 panel on Low-PV Open-circuit voltage 48V is below the 80V minimum for this input, so it will not start charging. | High-PV + Low-PV | 52.6 | 9.8 | 0 | Don't connect |
| 2 panels in parallel on High-PV Open-circuit voltage 48V is below the 80V minimum for this input, so it will not start charging. | High-PV | 52.6 | 19.6 | 0 | Don't connect |
Quick answers
Will the EcoFlow 400W Portable Solar Panel work with the EcoFlow DELTA Pro Ultra?
Yes. One EcoFlow 400W Portable Solar Panel works with the EcoFlow DELTA Pro Ultra: about 52.6 V on a 20°F morning against the station's 150 V limit, and about 400 W in full sun. Two panels: works (2 panels in series on High-PV), about 800 W.
Can I connect two 400W Portable Solar Panel panels to the DELTA Pro Ultra?
Yes, 2 panels in series on High-PV. That gives about 800 W.
What cable do I need to connect the 400W Portable Solar Panel to the DELTA Pro Ultra?
Use the solar charging cable that came with the station (MC4 on the panel side).
Is it safe on a cold morning?
Panel voltage rises in the cold. One 400W Portable Solar Panel goes from 48 V on its label to about 52.6 V at 20°F and 54.2 V at 0°F. The DELTA Pro Ultra accepts up to 150 V on the Low-PV.
Where to buy
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Other panels that work with the DELTA Pro Ultra
- EcoFlow DELTA Pro Ultra: solar input 30 to 150 V on the Solar in 2 (Low-PV). EcoFlow sets this limit on open-circuit voltage (Voc), so we hold the panels' Voc on your coldest morning to it.
- Cold raises panel voltage: we add 0.30% per °C below 77F (25°C), a typical figure, since this panel does not publish its own. At 20F one panel's 48 V becomes 52.6 V.
- Current over the 15 A cap is safe: the station takes 15 A and you get fewer watts. We count only the capped watts.
- Max 1,600 W on this input, 5,600 W across all inputs.
- Cold-morning voltage uses 0.30% per °C, typical for crystalline panels. This panel's own value is not published.
- Expected watts are the best case in full sun. Real-world midday output is usually 60 to 80% of that.
- Some numbers for EcoFlow 400W Portable Solar Panel come from a shop listing we have not confirmed in the manual yet.