Anker SOLIX F3800 vs EcoFlow Delta Pro 3: Which Should You Buy in 2026?

The Anker SOLIX F3800 and EcoFlow Delta Pro 3 are two of the best-known large home-backup power stations. Both are roughly 4kWh-class LiFePO4 units on wheels, both offer 120/240V output and both can be expanded with extra batteries and linked into a home panel. The decision comes down to output, ecosystem, expansion path and the warranty and support you trust.

At a glance

These two are close competitors, so the table focuses on where their approaches differ rather than headline capacity. Figures below are class-level ranges rather than lab measurements; exact capacity, output and weight vary by production batch and regional version, so confirm the current spec sheet before you order.

Where the SOLIX F3800 wins

Output headroom

The F3800 class is aimed at higher continuous output, which helps when several large loads, such as a well pump plus a fridge, start together.

240V appliances

With strong split-phase output, it is well suited to 240V well pumps, some mini-split systems and EV trickle charging.

Warranty reputation

Anker commonly offers long warranties on its SOLIX LiFePO4 products, and its customer support has a solid reputation in the charging space.

Where the Delta Pro 3 wins

Weight and footprint

The Delta Pro 3 class is lighter and a little more compact, which matters if you ever move it to a truck or cabin.

Charging speed and sources

EcoFlow’s fast AC charging and multi-source charging options let it refill quickly between outages or from a generator.

Ecosystem breadth

EcoFlow’s range of accessories, including smart generators, alternator chargers and home panels, gives more integration options.

Runtime math on real loads

Runtime is simply usable watt-hours divided by load watts. We assume about 85% of rated capacity reaches your devices after inverter losses, which is typical for LiFePO4 stations running AC loads. With nearly identical capacity, runtimes are close. The real difference shows up when you stack loads: output limits, not battery size, decide whether the sump pump and microwave can run at the same time.

Noise, space and placement

Both units use cooling fans that ramp up during fast charging and heavy output, so place them in a garage, utility room or basement rather than a bedroom. Leave several inches of clearance around vents, keep them off damp concrete with a simple platform, and store them between roughly 50°F and 85°F for the best long-term cell health. Neither produces fumes, so indoor placement is safe, which is their key advantage over a portable gas generator.

Expansion and total system cost

Both units scale into the 10kWh-plus range with extra batteries, but costs add up quickly. A realistic whole-home-circuit setup, meaning base unit, one or two batteries, a transfer switch and installation, often costs several thousand dollars more than the base station alone. Compare total system prices, including the home-integration hardware, not just the station.

Checklist before you order

• Your peak load: add up everything that will run at the same moment and keep it under about 80% of the continuous inverter rating of the SOLIX F3800 or Delta Pro 3.
• Your daily energy: multiply each device’s watts by its hours of use, total it, then divide by 0.85 to find the rated capacity you need.
• Surge: motors in fridges, pumps and compressors can briefly pull three to five times their running watts; check the surge rating, not only the continuous one.
• Recharge path: confirm wall-charge time, maximum solar input and whether car or generator charging is supported.
• Warranty and cycles: LiFePO4 units are typically rated for roughly 3,000+ cycles to 80% capacity; favour longer warranties and authorised sellers.

Which should you buy?

Buy the SOLIX F3800 if…

you have heavy 240V equipment or large simultaneous loads, want maximum output headroom and value Anker’s warranty and support approach.

Buy the Delta Pro 3 if…

you prefer a slightly lighter unit, want fast charging and a broad accessory ecosystem, and your loads fit comfortably within its output class.

FAQ

Can these run central air conditioning?

Some smaller central AC systems can run with a soft-start kit, but runtime on a ~4kWh battery is only two to three hours. For whole-home AC through a long outage, you need expansion batteries or a standby generator.

Which is better for a well pump?

Both can run typical 240V well pumps. The station with more output headroom is safer for pumps with large start-up surges, so check your pump’s locked-rotor amps against each unit’s surge rating.

Bottom line

The SOLIX F3800 is the stronger choice for heavy 240V loads and maximum output, while the Delta Pro 3 is lighter, charges fast and sits in a wider ecosystem. Price out the full system, including transfer switch and installation, before deciding.