Portable power and solar generators

EcoFlow's 220 W Bifacial Panel by the Numbers: What "220 W Front / 175 W Rear" Means, Which Inputs It Fits, and What a Day Yields

Published · By the SolarPanelX editors · Updated · See individual checks and dates below

Summary

The panel is rated 220 W (±5 W) from the front and 175 W from the rear, written with a slash, not a plus: the rear figure is a separate rating for light reaching the back, not an addition to 395 W. Its open-circuit voltage is 21.5 V and short-circuit current 12.4 A, a nominal reference rather than a compatibility approval; its listed weight is 7.0 kg. At the New York average yield from PVWatts, the front rating alone works out to about 770 Wh a day. EcoFlow listed it at $399 on October 4, 2026, sold out for pre-order.

The spec table

EcoFlow NextGen 220W Bifacial Portable Solar Panel
Rated power220 W (±5 W) front / 175 W rear
Open-circuit voltage21.5 V
Voltage at max power18.4 V
Short-circuit current12.4 A front / 9.9 A rear
Current at max power11.9 A front / 9.5 A rear
CellsN-type TOPCon monocrystalline, 25% conversion efficiency
Unfolded615 × 2,155 × 25 mm (24.2 × 84.8 × 1.0 in)
Folded615 × 590 × 32 mm
Weightabout 7.0 kg (15.4 lb)
Connectorphotovoltaic connectors, XT60i charging cable included
RatingIP68
Warranty12 months (US)
Price, October 4, 2026$399.00; pre-order, sold out

What the rear rating is for

Bifacial cells also produce from light that reaches the back, reflected off ground, snow or a light-colored surface. EcoFlow gives that side its own rating, 175 W, at its own current, 9.9 A. In use the two sides add, but the rear contribution depends on what is behind the panel; a panel on dark ground gets little of it. For sizing, use the 220 W front figure and treat the rear as a bonus that the stand's 30 to 60 degree tilt helps expose.

Check compatibility before connecting

A nominal 21.5 V open-circuit rating is only one input to the check. Confirm cold-weather voltage, panel tolerance, operating voltage, Imp, Isc and the receiving station's manual, as well as the cable and polarity. A matching XT60-style connector does not establish electrical compatibility.

The earlier pairing table labeled some combinations as fitting even where panel short-circuit current exceeded a quoted station current figure. Those approvals have been withdrawn. Do not assume a controller's current limiting permits an array above the manufacturer's specified Isc or overpaneling limits. The companion compatibility checklist linked below separates those checks.

What a day yields

Scaling PVWatts' New York figures from our earlier guides to 220 W: about 770 Wh on an average day, about 1,010 Wh in July, about 440 Wh in December; the Seattle and Phoenix averages from the camping guide scale to about 660 Wh and about 1,060 Wh. Those runs assume a fixed south-facing panel at 20 degrees; a portable setup can perform differently because of orientation, shading, temperature and time deployed. These grid-connected model results are not battery charging measurements.

Price per watt

$399 over 220 W is about $1.81 per front watt. EcoFlow's 400 W panel was $599 on the same day, about $1.50 per watt, sold out and on pre-order as well; its page gave a 23% conversion rate and no detailed electrical specs in the text we read.

How Many Foldable Solar Panels Can You Chain to One Power Station?

Solar Panel and Power Station Compatibility: Voltage, Current and Connector Checks

Shopping for one? Browse portable power stations →

Sources

  1. EcoFlow US — NextGen 220W Bifacial Portable Solar Panel
  2. EcoFlow US — 400W Portable Solar Panel
  3. NLR Developer Network — PVWatts API Version 8 (runs by the editors, September 23, 2026)
  4. Anker SOLIX — C300 Portable Power Station
  5. EcoFlow — DELTA 2 User Manual (Specifications)
  6. Anker SOLIX — C1000 Portable Power Station
  7. BLUETTI — Elite 100 V2 Portable Power Station
  8. Jackery — Explorer 2000 Plus Portable Power Station

We have not tested these products. Specs, prices, stock and terms are as published on these pages on the date above and can change; check the manufacturer or retailer before you buy.

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