Will the EcoFlow 400W Portable Solar Panel work with the EcoFlow DELTA Pro Ultra X?
No. Open-circuit voltage 48V is below the 80V minimum for this input, so it will not start charging. Two panels: works (2 panels in series on High-PV), about 800 W.
Don't connect
Do not plug this in. Open-circuit voltage 48V is below the 80V minimum for this input, so it will not start charging.
- Open-circuit voltage 48V is below the 80V minimum for this input, so it will not start charging.
400 W, open-circuit 48 V, short-circuit 11 A, working 41 V / 9.8 A. Unconfirmed Panel details
EcoFlow DELTA Pro Ultra XSolar input High-PV: 80 to 500 V; High-PV: 80 to 500 V, 10000 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 |
| 1 panel on High-PV + 1 panel on High-PV Open-circuit voltage 48V is below the 80V minimum for this input, so it will not start charging. | High-PV + High-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 X?
No. Open-circuit voltage 48V is below the 80V minimum for this input, so it will not start charging. 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 X?
Yes, 2 panels in series on High-PV. That gives about 800 W.
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 X accepts up to 500 V on the High-PV.
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- EcoFlow DELTA Pro Ultra X: solar input 80 to 500 V on the Solar in 1 (High-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 5,000 W on this input, 10,000 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.