EcoFlow DELTA Pro 3 with the EcoFlow NextGen 220W Bifacial
Works, with caveats · 4S1P · 876 W
Thick mark: cold Voc · Thin mark: operating Vmp, 73.6 V
2 caveats
- The maker publishes no temperature coefficient, so cold voltage uses our conservative −0.40 %/°C.
- The connector type comes from a secondary source, so check the physical port.
Parts for this layout
- EcoFlow DELTA Pro 3$2,799 View on Amazon
- 4 × EcoFlow NextGen 220W Bifacial$1,596 View on Amazon
- 10 FT Solar to XT60 Extension Cable Solar Panel XT60 Adapter$22.99 View on Amazon
Estimated total $4,417.99
Prices can change. The price on Amazon at purchase is what applies.
Can I connect the EcoFlow NextGen 220W Bifacial to the EcoFlow DELTA Pro 3?
Yes, with limits. The best setup is 4 panels wired 4S1P on High-PV Input, delivering up to 876 W. That string reaches 98.0 V at −10 °C against the port’s 150 V limit, using our cautious cold-weather assumption because EcoFlow publishes no temperature coefficient. Check your own unit’s labels too.
Danger: overvoltage risk. Do not connect the layouts marked red below. Going over a station’s input voltage limit can permanently damage it.
What is the best way to wire EcoFlow NextGen 220W Bifacial panels to the EcoFlow DELTA Pro 3?
Wire them 4S1P on High-PV Input for about 876 W from 4 panels. The string runs at 73.6 V, above the 30 V minimum the port needs to start. Stop at 2 in series on the lowest-voltage port, because 3 in series exceeds its limit in the cold.
| Port | Layout | Voc 25 °C | Voc 0 °C | Voc −10 °C | Voc −20 °C | Vmp | Isc | Watts | Verdict at −10 °C |
|---|---|---|---|---|---|---|---|---|---|
| High-PV Input | 1S1P | 21.5 | 23.7 | 24.5 | 25.4 | 18.4 | 12.4 | 0 | Won’t charge: below MPPT floor |
| High-PV Input | 1S2P | 21.5 | 23.7 | 24.5 | 25.4 | 18.4 | 24.8 | 0 | Won’t charge: below MPPT floor |
| High-PV Input | 2S1P | 43.0 | 47.3 | 49.0 | 50.7 | 36.8 | 12.4 | 438 | Works, with caveats |
| High-PV Input | 2S2P | 43.0 | 47.3 | 49.0 | 50.7 | 36.8 | 24.8 | 552 | Over the current limit |
| High-PV Input | 3S1P | 64.5 | 71.0 | 73.5 | 76.1 | 55.2 | 12.4 | 657 | Works, with caveats |
| High-PV Input | 4S1P | 86.0 | 94.6 | 98.0 | 101.5 | 73.6 | 12.4 | 876 | Works, with caveats |
| Low-PV Input | 1S1P | 21.5 | 23.7 | 24.5 | 25.4 | 18.4 | 12.4 | 219 | Works with the right cable |
| Low-PV Input | 1S2P | 21.5 | 23.7 | 24.5 | 25.4 | 18.4 | 24.8 | 368 | Over the current limit |
| Low-PV Input | 2S1P | 43.0 | 47.3 | 49.0 | 50.7 | 36.8 | 12.4 | 438 | Works with the right cable |
| Low-PV Input | 2S2P | 43.0 | 47.3 | 49.0 | 50.7 | 36.8 | 24.8 | 736 | Over the current limit |
| Low-PV Input | 3S1P | 64.5 | 71.0 | 73.5 | 76.1 | 55.2 | 12.4 | 0 | Danger: overvoltage |
| Low-PV Input | 4S1P | 86.0 | 94.6 | 98.0 | 101.5 | 73.6 | 12.4 | 0 | Danger: overvoltage |
How cold can it get before this string overvolts the EcoFlow DELTA Pro 3?
A string of 3 EcoFlow NextGen 220W Bifacial panels breaches the 60 V limit of Low-PV Input even at 25 °C, before any cold correction. Voltage rises as cells cool, at our assumed −0.40 %/°C (no figure is published), so a clear winter sunrise is the worst case. Stay at 2 in series or fewer there.
The cold-weather correction is the same one NEC Article 690.7 requires for PV system voltage.
Which cable connects the EcoFlow NextGen 220W Bifacial to the EcoFlow DELTA Pro 3?
You need an MC4 to XT60 adapter cable, rated for at least 12.4 A, to connect this array’s output to High-PV Input. Confirm the plug against your own station’s port, and check polarity before first use. Keep runs short, because voltage drop grows with current and distance.
How long does the EcoFlow NextGen 220W Bifacial take to recharge the EcoFlow DELTA Pro 3?
Expect about 6.6 peak-sun hours for a full charge from 4 panels. That’s 1.1 days in Denver, CO in June and 1.5 days in December, using a 0.70 real-world derate and NREL irradiance data. Clouds, shade and panel angle can all push it longer.
| City | June | December |
|---|---|---|
| Phoenix, AZ | 0.9 | 1.2 |
| Denver, CO | 1.1 | 1.5 |
| Los Angeles, CA | 1.0 | 1.4 |
| Austin, TX | 1.1 | 1.5 |
| Miami, FL | 1.2 | 1.4 |
| Atlanta, GA | 1.2 | 1.7 |
| Chicago, IL | 1.2 | 2.5 |
| New York, NY | 1.3 | 2.3 |
| Seattle, WA | 1.3 | 4.2 |
Where do these EcoFlow DELTA Pro 3 and EcoFlow NextGen 220W Bifacial numbers come from?
Station limits come from us.ecoflow.com and panel ratings from us.ecoflow.com, each checked against a verbatim quote on that page. Panels must also pass a physics test: Vmp times Imp must land within 15% of rated watts. Anything failing goes to quarantine and gets no page.
| Rated power | 220 W | us.ecoflow.com“220W (±5W) Front/175W Rear” |
|---|---|---|
| Open-circuit voltage (Voc) | 21.5 V | us.ecoflow.com“21.5V (Vmp 18.4V)” |
| Operating voltage (Vmp) | 18.4 V | us.ecoflow.com“Vmp 18.4V” |
| Short-circuit current (Isc) | 12.4 A | us.ecoflow.com“12.4A (Imp 11.9A) Front Side” |
| Operating current (Imp) | 11.9 A | us.ecoflow.com“Imp 11.9A” |
| Voc temperature coefficient | −0.40 %/°C | Assumed: not published by the maker |
| Output connector | MC4 | us.ecoflow.comsecondary“Photovoltaic connectors (adapted to MC4 connectors)” |
| High-PV Input | 30 to 150 V, 15 A, 1600 W | us.ecoflow.com“High-PV Input: 30V-150V⎓, 15A, 1600W Max” |
|---|---|---|
| Low-PV Input | 11 to 60 V, 20 A, 1000 W | us.ecoflow.com“Low-PV Input: 11V-60V⎓, 20A, 1000W Max” |
| High-PV Input connector | XT60 | offgridstores.comsecondary“EcoFlow Solar to XT60i Charging Cable” |
| Low-PV Input connector | XT60i | offgridstores.comsecondary“EcoFlow Solar to XT60i Charging Cable” |
Prices last checked and spec data verified on .