Anker SOLIX F3800 Plus vs EcoFlow DELTA Pro 3 (2026)

The EcoFlow DELTA Pro 3 delivers 1.46 Wh per dollar against 1.28 Wh per dollar for the Anker SOLIX F3800 Plus, which scores 10.0/10 to 8.8/10 on the capacity-per-dollar benchmark. It holds 4,096 Wh for $2,799, while the F3800 Plus holds 3,840 Wh for $2,999.99.

The F3800 Plus counters on power. It is rated for 6,000 W of combined 120/240 V output and 3,200 W of solar input, against 4,000 W and 2,600 W on the DELTA Pro 3. For a full-time RVer with 240 V split-phase loads, that gap may matter more than 256 Wh of extra capacity. For an off-grid cabin that wants room to grow, the DELTA Pro 3’s expansion to 48 kWh matters more. This comparison uses published specifications and list prices only, with no hands-on testing.

Spec comparison

Spec	Anker SOLIX F3800 Plus	EcoFlow DELTA Pro 3
Price on review date (2026-10-29)	$2,999.99 list	$2,799 sale ($3,299 list)
Capacity	3,840 Wh	4,096 Wh (expandable to 48 kWh)
Chemistry	LiFePO4	LiFePO4
Rated cycles	3,000+ (end-of-life capacity not stated)	4,000 to 80% capacity
Continuous AC output	6,000 W total via 120/240 V; 2,400 W on standard 120 V outlets	4,000 W (X-Boost up to 6,000 W)
Max solar input	3,200 W	2,600 W
AC recharge	1,800 W max AC input (time not listed)	0-80% in 50 min
Weight	136.7 lb	Not listed
Warranty	5 years	5 years
Stock on review date	Listed for sale	Base unit sold out
Runtime at steady 100 W (85% efficiency)	about 32.6 hours	about 34.8 hours
Price per kWh over rated cycles	$0.26	$0.17
Capacity per dollar	1.28 Wh per $ (8.8/10)	1.46 Wh per $ (10.0/10)

Method for the benchmark: rated capacity in Wh divided by the US price on the manufacturer’s store. For the DELTA Pro 3 that is 4,096 ÷ $2,799 = 1.46. For the F3800 Plus it is 3,840 ÷ $2,999.99 = 1.28.

For RVers who need 240 V split-phase power, the output rows matter most: 6,000 W total via 120/240 V, with 2,400 W available on standard 120 V outlets. The facts for the DELTA Pro 3 give 4,000 W continuous and an X-Boost rating up to 6,000 W but do not describe 240 V or split-phase output. Confirm that on EcoFlow’s page before buying for a 240 V rig.

For off-grid cabins, the capacity, expansion and solar rows matter most. The weight row also matters for anyone who plans to move the unit. The F3800 Plus is 136.7 lb, and the DELTA Pro 3 weight is not listed.

Total cost of ownership (1-3 years)

The upfront gap is $200.99: $2,999.99 for the F3800 Plus against $2,799 for the DELTA Pro 3. The DELTA Pro 3 also has the lower pre-computed cost per stored kWh. Over its rated 4,000 cycles it costs $0.17 per kWh, against $0.26 per kWh for the F3800 Plus over 3,000 cycles. Both figures use list or sale price divided by lifetime kWh and ignore degradation.

Two caveats apply. First, the DELTA Pro 3’s $0.17 relies on the $500-off price. At the $3,299 list price, the same arithmetic gives $3,299 ÷ 16,384 kWh = about $0.20 per kWh, and capacity per dollar falls to 4,096 ÷ $3,299 = 1.24, below the F3800 Plus’s 1.28. Second, the cycle ratings are not equivalent. The DELTA Pro 3’s 4,000 cycles are measured to 80% capacity, while Anker lists 3,000+ cycles without an end-of-life capacity.

Over 1 to 3 years, cycle count is unlikely to be the limit. One full cycle per day for 3 years is about 1,095 cycles. Both units carry a 5-year warranty, so both cover the whole 3-year window.

Hidden costs the facts support:

• Expansion (DELTA Pro 3): the unit expands to 48 kWh, but expansion battery prices are not published here. Check them before planning a larger system.
• Expansion (F3800 Plus): expansion options are not listed in the facts. Confirm on Anker’s page if a cabin may outgrow 3,840 Wh.
• Solar: the panels, not the station, set the real cost of using 3,200 W or 2,600 W of input. Panel pricing is not part of the facts.
• 240 V connection: cabling, adapters or a transfer setup are not priced in the facts.
• Subscriptions and per-user fees: none are listed for either unit. Confirm there are none.
• Stock and promotions: the DELTA Pro 3 base unit was marked sold out on the US store on the review date. Confirm availability and that the discount still applies.

Real-world stress test

These are calculations from published specs, not field tests. Both use 85% inverter efficiency, the same assumption behind the pre-computed runtimes.

Scenario 1: a 5,000 W peak in a big rig

Suppose an RV runs a 5,000 W combined load for a short stretch, with part of it on 240 V.

• F3800 Plus: 5,000 W is under its 6,000 W combined 120/240 V rating. The catch is the 2,400 W limit on standard 120 V outlets, so the heavy loads must sit on the 240 V side. Usable energy is 3,840 Wh × 0.85 = 3,264 Wh, which gives about 39 minutes at 5,000 W.
• DELTA Pro 3: 5,000 W is above its 4,000 W continuous rating. It stays within the X-Boost ceiling of 6,000 W only if the loads qualify for X-Boost, which the facts do not define. At a flat 4,000 W, usable energy of 4,096 Wh × 0.85 = 3,482 Wh lasts about 52 minutes.

The DELTA Pro 3 hits its limit first, on output. The F3800 Plus keeps running because its 6,000 W rating covers the load. Both drain the battery in under an hour at these loads.

Scenario 2: a cabin averaging 400 W

A cabin that averages 400 W uses 400 W × 24 h = 9,600 Wh per day.

• Battery alone: the F3800 Plus gives 3,264 Wh ÷ 400 W = about 8.2 hours. The DELTA Pro 3 gives 3,482 Wh ÷ 400 W = about 8.7 hours. Neither covers a full day without recharging.
• Solar: at rated maximum input and before losses, replacing 9,600 Wh takes about 3.0 hours on the F3800 Plus (9,600 ÷ 3,200 W) and about 3.7 hours on the DELTA Pro 3 (9,600 ÷ 2,600 W). Panels rarely hold their peak rating all day, so real recharge time is longer.
• Generator or grid backup: the DELTA Pro 3 lists 0-80% in 50 min. The F3800 Plus lists 1,800 W max AC input but no recharge time, so a full charge takes at least 3,840 Wh ÷ 1,800 W = about 2.1 hours before losses.

The F3800 Plus recharges faster from solar. The DELTA Pro 3 lasts a bit longer per charge and has a published fast AC recharge time. On a cabin that outgrows one unit, the DELTA Pro 3’s 48 kWh expansion path is the only one the facts document.

Who should buy Anker SOLIX F3800 Plus

• You run a large rig with 240 V loads. It is rated for 6,000 W total via 120/240 V.
• You have a big solar array. It accepts up to 3,200 W of solar input, 600 W more than the DELTA Pro 3.
• You want it in stock now. It was listed for sale on the review date, while the DELTA Pro 3 base unit was sold out.
• You accept the weight. At 136.7 lb it is heavy, but the figure is published, which the DELTA Pro 3’s is not.

Who should buy EcoFlow DELTA Pro 3

• You want the most capacity per dollar. It scores 1.46 Wh per $, with 4,096 Wh at $2,799.
• You plan to grow the system. It expands to 48 kWh.
• You want a longer rated life. It is rated for 4,000 cycles to 80% capacity, and its pre-computed cost is $0.17 per kWh.
• You need quick AC top-ups. It lists 0-80% in 50 min, while Anker publishes no recharge time.

Verdict

The DELTA Pro 3 wins the capacity-per-dollar benchmark: 1.46 Wh per $ (10.0/10) against 1.28 Wh per $ (8.8/10) for the F3800 Plus. It also has the lower cost per rated kWh, $0.17 against $0.26. That lead depends on the $500 discount and on the base unit being in stock, which it was not on the review date.

The F3800 Plus is still the right buy for a big rig that needs 6,000 W of combined 120/240 V output and 3,200 W of solar input. Anyone with 240 V split-phase loads should confirm the DELTA Pro 3’s 240 V output on EcoFlow’s page first. If it is not available, the F3800 Plus is the safer choice.