Can either start a 1/2 hp well pump?

No. The pump's locked-rotor start is 7,056 W (Franklin Electric), above both the Jackery's 4,400 W peak and the DELTA 3 Max's 4,800 W surge. See the DELTA Pro 3 well-pump page for a station that does.

How long do they run a refrigerator?

About 37 hours each on the reference top-freezer fridge's 47 W yearly average (2,042 or 2,048 Wh × 0.85 ÷ 47 W), and about 4.8 hours if the compressor ran without stopping at 360 W.

What is the cycle life of the DELTA 3 Max?

EcoFlow's DELTA 3 Max page prints no cycle-life figure, so the table says "not published". Jackery gives 4,000 cycles to 70 % of original capacity for the Explorer 2000 v2.

Can I add batteries to either?

Jackery's FAQ says the Explorer 2000 v2 is not expandable. The DELTA 3 Max page this site uses does not state it either way; the DELTA 3 Max Plus is EcoFlow's expandable version.

Jackery Explorer 2000 v2 vs EcoFlow DELTA 3 Max

	Jackery Explorer 2000 v2	EcoFlow DELTA 3 Max
Maker list price	$999 source (2026-10-31)	$1,199 source (2026-10-31)
Capacity	2,042 Wh source	2,048 Wh source
$ per Wh	0.49	0.59
AC continuous	2,200 W source	2,400 W source
AC peak	4,400 W source	4,800 W source
Chemistry	LiFePO4 source	LiFePO4 source
Cycle life	4,000 cycles to 70 % of original capacity source	not published
Solar input	400 W source	500 W source
Wall charge	1.75 h source	1.13 h to 80 % source
UPS switch-over	20 ms source	10 ms source
Weight	39.5 lb source	44.8 lb source
Expandable	No source	—
Warranty	3 yr source	5 yr source

Who each is for

Both hold about 2 kWh of LiFePO4: 2,042 Wh in the Explorer 2000 v2 and 2,048 Wh in the DELTA 3 Max. They are sized for a fridge through a night and day, a CPAP for most of a week, or a 1,500 W appliance for about an hour. The Jackery costs less per Wh at list price and weighs less. The EcoFlow has more inverter headroom, recharges faster from the wall and carries a longer warranty.

Continuous and peak output, by appliance

Jackery rates the 2000 v2 at 2,200 W continuous and 4,400 W peak. EcoFlow rates the DELTA 3 Max at 2,400 W and 4,800 W surge; its 3,400 W X-Boost is a boost mode and is not counted.

1/2 hp well pump: neither starts it. The 7,056 W locked-rotor start is beyond both peak ratings, even though the 1,000 W running load would fit. See Can the DELTA Pro 3 start a 1/2 hp well pump?
1/2 hp sump pump (2,150 W start): both pass, with about 2.4 h of pumping per charge.
1,500 W space heater: both run it, for about 1.2 h. The Jackery has 700 W of headroom, the EcoFlow 900 W.

Energy and runtime

Neither maker prints a runtime factor for these models, so the site's 0.85 applies: about 1,736 Wh against 1,741 Wh usable, a negligible difference. On the reference top-freezer fridge's 47 W yearly average, both give about 37 h. A CPAP at 34 W for 8 hours a night gets about 6.4 nights on either; confirm your device's draw with its manufacturer.

Cycle life

Jackery gives 4,000 cycles to 70 % of original capacity. EcoFlow's DELTA 3 Max page prints no cycle figure, and the site does not borrow the DELTA 3's "4,000 to 80 %" for it. Without the EcoFlow figure, long-term wear cannot be compared from published numbers.

Charging

EcoFlow gives 1,800 W AC input and 0 to 80 % in 68 minutes. Jackery gives 1.75 h on the AC adapter in its spec table, and about 1.7 h to full in its app-enabled emergency mode; it prints no AC input wattage. Solar input is 500 W on the EcoFlow and 400 W on the Jackery. Switchover for UPS-style use is under 10 ms on the EcoFlow and under 20 ms on the Jackery.

Weight, ports and noise

The Jackery weighs 39.5 lb. EcoFlow prints the DELTA 3 Max's weight in kilograms only, 20.3 kg (about 44.8 lb) plus 0.4 kg, as the page prints it, and sells a separate variant with detachable wheels. The Jackery has 3 AC outlets, a 100 W and a 30 W USB-C port, one USB-A port and a car outlet. The EcoFlow has one 100 W USB-C, two USB-C ports sharing 30 W, one USB-A and a 126 W car outlet, but its page gives no clear AC outlet count. Jackery lists 30 dB in Quiet Mode and 45 dB at full load; EcoFlow lists 25 dB or less at 600 W, both at 1 m. Both discharge from 14 to 113 °F and charge from 32 to 113 °F.

Warranty and channel

EcoFlow lists 5 years: 3 standard plus 2 extended after registering in the EcoFlow app. Jackery lists 3 years plus a 2-year extension, which its FAQ limits to Jackery's own site, Jackery-branded third-party platforms and authorized dealers.

Price per watt-hour

At maker list prices on 2026-10-31, the Jackery is $999, $0.49 per Wh, and the DELTA 3 Max is $1,199, $0.59 per Wh. EcoFlow showed an $899 sale price at the same time, about $0.44 per Wh, below the Jackery. Which is cheaper depends on the day you buy.

Verdict from the data

Runtime is a wash. The DELTA 3 Max has the stronger output side: 200 W more continuous, 400 W more surge, faster wall charging and 5 years of cover after app registration. The Explorer 2000 v2 is about 5 lb lighter, cheaper at list price and has a published cycle-life figure. Neither starts a 1/2 hp well pump.