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Solar · EcoFlow

Solar panels for the EcoFlow DELTA 2 Max

Written by Ian Schneider·Solar & Off-Grid Tester

EcoFlow rates the DELTA 2 Max's solar input twice. One port alone takes 500 W. Both ports together take 1000 W. The window on each is 11 to 60 volts, and the manual asks you to keep a panel's voltage inside 60 to avoid damaging the station. Thirty-one of the forty-one panels we track publish a voltage. All thirty-one sit under the line, and eight of them are EcoFlow's.

The battery is 2048 Wh. Both ports full is about two hours of good sun, and four sets we track get there, each of them four large panels. EcoFlow's own 400 W folding panel is one of the four. One 200 W folding panel on a single port gives about 144 W and needs about fourteen hours. At the cabin I'd put a cable in each socket and have the waiting done by Saturday lunch.

The door
11–60 V
Its width
1000 W
Plug
Full battery, best case
~2 h
EcoFlow DELTA 2 Max portable power station
EcoFlow's cable page names the stations its solar cable works best with. The older DELTA Max is on that list. The DELTA 2 Max, a different station, is not.

The door

Every panel we track, lined up at the DELTA 2 Max's solar input

Every panel we track with a published voltage, standing in a line by that voltage. The figure is Voc, the open-circuit voltage, what a panel reads in sun with its leads connected to nothing. The black line is 60 V, and each of the DELTA 2 Max's two ports has one. No bar reaches it.

Two of EcoFlow's own stand in different places. The 400W folding panel reads 48 V on its label and the 400W Rigid reads 37.1. Same watts, different height, both well under the line. The pale cap on each bar is the extra voltage a −10 °C morning adds, about 10%. A cold cell puts out more voltage than a warm one. A panel that just fits in August does not fit on my deck in December. Nothing in this line is that close.

The bars are single panels, and this station has two sockets, so a pair of panels can have a socket each. Put two in series anyway, the positive lead of one into the negative of the next, and their voltages add. Two of the 400W folders end to end would be past the line. Side by side on one port, in parallel, the voltage stays at one panel's worth and the current adds, and the manual stops that at 15 amps a port.

Run the pointer along the line and each bar gives its name. If your panel isn't among them, type the Voc off its back label into the box and the chart stands a bar up for it, cap included.

Swipe sideways for the whole line-up.

020406080volts, open-circuit+1++yours?60 V · the lintel11 V · the step

Hover or tap a bar for the panel’s name and its verdict.

  • Fits through the door
  • Too tall
  • Extra height on a −10 °C morning
  • Maker prints only the operating voltage; the real height is above the dashes
  • 1Our pick: BLUETTI 350W

What we'd buy

The best solar panel for the DELTA 2 Max

Picked by the numbers on this station, not by brand.

Best overall

BLUETTI 350W Solar Panel (PV350)

4 panels deliver 1000 W, the most the input takes.

Check price at BLUETTI

Best value

Eco-Worthy 200W Flexible HJT Solar Panel 18V ETFE 18BB (GW-L02AM200HJT2)

About $1.25 for every watt it actually delivers here. 4 panels deliver 576 W.

Check price at Eco-Worthy

Best to carry

Renogy 200W Portable Solar Panel Blanket (RPP200SB-SE)

144 W from a 8.82 lb panel, the most delivered watts per pound.

Check price at Renogy

A day on solar

How long the DELTA 2 Max takes to charge on solar

Two hours, with both ports full and 1000 W coming in. Four sets we track get there, and every one of them is four panels, so the tick is a four-panel tick. The list below names them.

Most people carry one panel. A 100 W folding panel gives about 72 W in real sun, and at 72 W a 2048 Wh battery needs about twenty-eight hours. A 200 W panel gives 144 W and needs about fourteen.

A good day has 3 to 6 hours of sun that strong. The four-panel set is done inside one of them. Fourteen hours is a few of those days. Twenty-eight is a week of clear weather, and my pines shade the deck for part of each of those days. If I set one 200 W folder out on a Friday evening, I'd expect to still be reading the screen on Sunday. The system builder turns the hours into days for your state and month.

a good day's sun: 3 to 6 h0 h1 h2 h3 h4 h5 h6 h7 h8 h9 h10 h11 h12 h13 h14 h15 h16 h17 h18 h19 h20 h21 h22 h23 h24 h25 h26 h27 h28 h29 hInput full (1000 W) · full in 2 hOne 200 W panel (144 W delivered) · full in 14.2 hOne 100 W panel (72 W delivered) · full in 28.4 h

Hours of good sun, from empty. Where you live and the month decide how many of those a day gives; the system builder works it out.

Every panel that fits

Solar panels compatible with the DELTA 2 Max

Thirty-one fit, eight of them EcoFlow's own. For each: what a single panel delivers in good sun and the most the DELTA 2 Max will take from a set of them, four panels every time. The cable column is blank on this page. Neither the manual nor the product page says which plug the socket is. The manual's accessory note hedges, Solar to XT60/XT60i Charging Cable, XT60 being a yellow DC plug and XT60i EcoFlow's own version of it. The same note says the cable and the panels are not in the box. Most rigid panels end in MC4, the weatherproof snap-together pair, so read the end of your panel's lead before ordering the cable. Sorted by delivered watts.

Own a panel that isn't in the line-up?

Type its voltage into the door chart above for the height test, then put the rest of the label into the panel checker, already set to the DELTA 2 Max, for current and plug too. Or build the whole system to see how it keeps up where you live.

The plain answers

How long does the DELTA 2 Max take to charge on solar?

One 100 W panel delivers about 72 W in good sun and refills the 2048 Wh battery from empty in about 28.4 hours.

One 200 W panel delivers about 144 W in good sun and refills the 2048 Wh battery from empty in about 14.2 hours.

At its 1000 W solar limit it refills in about 2 hours. More panel watts than that won't charge it any faster.

A day gives three to six hours of sun that good, depending on season and place, so one 100 W panel takes 5 to 10 days to fill it. The system builder works it out for your state and month.

What adapter does the DELTA 2 Max need for solar?

Every panel we track needs a cable to reach its input. None comes in the box.

31 panels don't have a named plug from their maker, so check the lead before you buy a cable.

Can you use non-EcoFlow solar panels with the DELTA 2 Max?

Yes. What decides it is the panel's voltage and plug, not the brand. 23 panels from Renogy, Jackery, Anker SOLIX, BLUETTI, Eco-Worthy and Rich Solar work with it, as long as the panel stays under 60 V on a cold morning and starts above 11 V.

The strongest single panels here are the Renogy 590W N-Type Bifacial (425 W delivered) and the Jackery SolarSaga 500 X (360 W delivered).

Can you connect two solar panels to the DELTA 2 Max?

Yes. It has 2 solar inputs, so the simplest way is one panel on each. Use the same panel model on both. EcoFlow's inputs share a controller, and mismatched panels hold each other back.

Don't wire two BLUETTI PV100 FX Flexible panels in series: together they would pass its 60 V limit. Parallel them instead.

Past 1000 W delivered, more panels only help on cloudy days.

What is the DELTA 2 Max's solar input?

Solar charging input (×2): 11–60 V, up to 15 A, 500 W. Solar charging input (×2): 11–60 V, up to 15 A, 500 W. 1000 W across all inputs together.

Input limits from EcoFlow's documents, checked 2026-09-18 (source). Delivered watts assume 72% of the panel's rating in good sun.