Anker’s SOLIX E10 and EcoFlow’s DELTA Pro Ultra both start from a battery module of exactly 6,144Wh and both scale to about 90kWh, but they are built for different homes, according to the two makers’ U.S. spec pages. Anker rates one E10 at 7.68kW continuous, with surge figures The Verge reported at up to 28.8kW, and designs it for outdoor installation with an optional tri-fuel generator. EcoFlow rates one DELTA Pro Ultra inverter at 7,200W, puts it on casters, and lets it roll from the garage to an RV or job site. This comparison lines up the specs, the installation path and the runtime math so you can see which one fits your backup plan.
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Specs come from Anker’s SOLIX E10 product page and The Verge’s January 2026 launch report, and from EcoFlow’s DELTA Pro Ultra product page and user manual (models EFYJ751-PCS-US and EFYJ751-BP). I haven’t installed either system. Runtime numbers below are my own estimates and are labeled that way. You can see current listings for the Anker SOLIX E10 and the EcoFlow DELTA Pro Ultra on Amazon.
The Short Answer
Pick the Anker SOLIX E10 if you want a fixed, weatherproof whole-home backup system with very high surge for well pumps and central AC, up to 9kW of solar per unit, and a generator that can recharge it automatically.
Pick the EcoFlow DELTA Pro Ultra if you want a system you can move. It works as a home backup through EcoFlow’s Smart Home Panel 2, but it also runs on its own outlets, rolls on casters, and can go with you to an RV park, a cabin or a job site.
Spec Comparison
| Spec | Anker SOLIX E10 | EcoFlow DELTA Pro Ultra |
|---|---|---|
| Battery module | B6000, 6.144kWh LiFePO4 | 6,144Wh LFP (102.4V, 60A) |
| Modules per unit | Up to 5 (about 30kWh) | Up to 5 per inverter (about 30kWh) |
| Max system size | Three linked units through the Power Dock, about 90kWh | 3 inverters, 15 batteries with Smart Home Panel 2: about 90kWh |
| Continuous output, one unit | 7.68kW (240V/32A) with 1 battery; 10kW for up to 90 min with 2+ batteries | 7,200W pure sine, 120/240V |
| Max output, three units | 22.8kW (30kW turbo) | 21.6kW with Smart Home Panel 2 |
| Reported surge | 28.8kW (one battery) to 37.2kW (two or more), per The Verge | EcoFlow does not list a whole-unit surge figure on its U.S. spec table |
| Solar input per unit | Up to 9kW high-voltage PV (30–450V) | 5.6kW: high-PV 80–450V 4,000W + low-PV 30–150V 1,600W |
| Switchover | Under 20ms | 0ms on online UPS outlets; under 20ms on backup UPS outlets |
| Weather rating | NEMA 4 / IP66, rated for outdoor mounting | IP54 when not in use |
| Weight | Power module 60.6 lb; battery 130 lb each | Inverter 70 lb; battery 111.8 lb each |
| Portable use | 1,800W 120V/15A outlet on the unit | Full outlet panel: 4 × 5-20R, TT-30, L14-30, 6-20R |
| Generator | Anker SOLIX Smart Generator 5500 (gas, propane, natural gas) or existing generator | Generator input through the 30A power input/output port; EcoFlow sells its own Smart Generator |
| Rated battery life | 4,000 cycles to 80% capacity | 80%+ after 3,500 cycles; 5-year warranty |
| Starting price | $4,299 (power module + 1 battery, Anker) | EcoFlow listed an $8,999 bundle including installation at the time of our review |
The two battery modules hold the same 6,144Wh, so storage math is identical module for module. The differences are in power, solar, enclosure and how each system attaches to your house.
Power and Surge: Where Anker Pulls Ahead
Anker designed its system around big motor loads. One unit is rated 7.68kW continuous, and with two or more batteries it can deliver 10kW for up to 90 minutes. Surge is the standout: The Verge listed 28.8kW (120 LRA) with one battery and 37.2kW (155 LRA) with two or more. LRA, or locked-rotor amps, is the inrush a compressor or pump motor pulls for a split second at startup, and it’s the number that decides whether a central AC unit or deep well pump will start on battery.
The DELTA Pro Ultra’s 7,200W rating is still a lot of power for one box. It covers a fridge, furnace blower, sump pump, lights, internet gear and a window AC at the same time. For a large central AC, EcoFlow’s answer is to add a second or third inverter through the Smart Home Panel 2. If motor starting is your main concern, my explainer on surge watts vs running watts walks through how to read a compressor’s nameplate.
Solar Charging
Each Anker power module accepts up to 9kW of high-voltage solar at 30–450V, and Anker says three linked units can take 27kW. That’s enough for a typical full rooftop array on one unit.
Each DELTA Pro Ultra inverter has two solar inputs: a high-PV port (80–450V, 15A, 4,000W max) and a low-PV port (30–150V, 15A, 1,600W max), for 5.6kW combined. With three inverters that’s 16.8kW. The low-PV port is handy for portable panels at a campsite, which fits the DELTA Pro Ultra’s dual home and mobile role.
Worked example: one sunny day (estimate)
Assume a location where each kW of panels makes about 4.5kWh on a clear day. Anker’s unit with a full 9kW array could harvest about 40kWh, enough to refill a five-battery 30.7kWh stack and still run daytime loads. A DELTA Pro Ultra inverter with 5.6kW of panels would harvest about 25kWh, enough to refill two batteries (12.3kWh) and cover about 12kWh of daytime use. Real output varies with season, tilt and weather.
Installation and Placement
Anker’s enclosure carries a NEMA 4 (IP66) rating, so the whole stack can live on an exterior wall or a slab beside the house. In places that flood, Anker recommends hanging it on the wall. You’ll hire an electrician once, for the Smart Inlet Box (simpler backup) or the Power Dock (multi-unit and generator setups), and Anker says you can slot in extra batteries on your own later.
The DELTA Pro Ultra is rated IP54 when not in use and is meant for indoor or sheltered spots like a garage or utility room. EcoFlow’s manual lists four mounting options: a portable stand with casters (up to five batteries), two stacked sets, a shelf with separate locations, and a trolley for one inverter and one battery. For whole-home or multi-circuit backup, an electrician installs the Smart Home Panel 2. Without the panel, the unit still works as a very large power station through its own outlets. My DELTA Pro Ultra setup guide covers the stacking, cabling and app steps from EcoFlow’s manual.
Both systems are heavy. Anker’s power module plus two batteries weighs about 321 lb across three modules, and a DELTA Pro Ultra with two batteries is about 294 lb. Plan for two people and a flat, solid surface.
Runtime Estimates
Because both systems are built from the same 6,144Wh module, battery count matters far more than brand for runtime. Here’s how long a given stack lasts at three steady loads.
| Steady load | One module (6.1kWh) | Three modules (18.4kWh) | Five modules (30.7kWh) |
|---|---|---|---|
| Fridge, internet and lights, 800W | about 7 hours | about 21 hours | about 35 hours |
| Average household, 2kW | about 2.8 hours | about 8.3 hours | about 14 hours |
| Summer afternoon with AC, 4kW | about 1.4 hours | about 4.1 hours | about 7 hours |
My estimates: module watt-hours × 0.9 for inverter losses ÷ steady load. Real homes cycle loads on and off, so actual runtime usually beats a steady-load number. Daytime solar stretches it further.
Worked Example: A House With a Well Pump and Central AC (estimate)
Say your must-run list is a fridge (150W), furnace blower (500W), 1HP well pump (about 1,000W running), lights and electronics (300W) and a 3-ton central AC (about 3,500W running). Running load is about 5.45kW. The well pump and AC can each pull several times their running watts for a moment at startup.
- Anker SOLIX E10 with two batteries: 7.68kW continuous, 10kW for up to 90 minutes and 37.2kW of reported surge cover the running load and both motor starts in one unit.
- EcoFlow DELTA Pro Ultra, one inverter: 7,200W covers the running load. For the AC compressor start, plan on a soft starter or a second inverter through the Smart Home Panel 2.
Now say you’re a homeowner who also spends summer weekends in a travel trailer. The DELTA Pro Ultra’s TT-30 outlet and trolley option let you take one inverter and one battery along, while the E10 stays bolted to the house.
Generator Integration
This is where Anker leans in hardest. Its optional SOLIX Smart Generator 5500 burns gasoline, propane or natural gas and kicks on by itself to top up the batteries when charge runs low, so a long outage doesn’t depend on sunny weather. Anker has sold a package with one battery, the Power Dock and that generator for $7,399. A generator you already own can also feed the system.
The DELTA Pro Ultra takes generator input through its 30A power input/output port, and EcoFlow’s app supports generator auto start and stop with EcoFlow’s Smart Generator. If you’re comparing generators and batteries in general, see generator vs battery backup for your home.
Who Should Buy Which
| Your priority | Better fit |
|---|---|
| Central AC or a deep well pump on backup | Anker SOLIX E10 |
| Outdoor installation in harsh weather | Anker SOLIX E10 |
| Large rooftop array on one unit (up to 9kW) | Anker SOLIX E10 |
| Take the system to an RV, cabin or job site | EcoFlow DELTA Pro Ultra |
| 0ms online UPS for computers and network gear | EcoFlow DELTA Pro Ultra |
| Use it now as a power station, add the home panel later | EcoFlow DELTA Pro Ultra |
| Same storage per module | Tie: 6,144Wh each |
Also weighing Anker’s other home battery? See my Anker SOLIX E10 vs X1 comparison. For the full EcoFlow rundown, read the EcoFlow DELTA Pro Ultra review.
Planning Checklist
- List your backup loads and add up the watts that run at the same time.
- Note any motor loads (AC, well pump, heat pump) and their LRA from the nameplate.
- Add up daily kWh and divide by 6.144 to get a battery count.
- Decide where the system will live: outdoors (Anker) or a garage or utility room (either).
- Decide how it will recharge: grid, solar, generator or all three.
- Get an electrician’s quote for the Smart Inlet Box or Power Dock (Anker) or the Smart Home Panel 2 (DELTA Pro Ultra).
Any connection to your home’s panel, a transfer switch or a rooftop array is licensed-electrician work.
FAQ
Do the E10 and DELTA Pro Ultra hold the same amount of energy?
Yes, per module. Both use a 6,144Wh LiFePO4 battery, and both scale to about 90kWh with three units.
Which has more power?
Per unit, Anker’s: 7.68kW continuous, or 10kW for up to 90 minutes with two or more batteries, versus 7,200W for one DELTA Pro Ultra inverter.
Can the DELTA Pro Ultra be installed outdoors like Anker’s system?
EcoFlow rates it IP54 when not in use and designs it for indoor or sheltered locations. Anker’s enclosure is NEMA 4 (IP66) and rated for outdoor installation.
Which one is quieter indoors?
EcoFlow says the DELTA Pro Ultra runs under 30dB in most scenarios and is silent at low draws under 2,000W. Anker’s system usually sits outdoors, where fan noise matters less.
Can I use either one as a portable power station?
The DELTA Pro Ultra is designed for it, with a full outlet panel and casters. Anker’s unit has a single 1,800W 120V outlet for convenience but is meant to stay installed.
Do I need an electrician?
For whole-home backup, yes. Anker’s system needs a Smart Inlet Box or Power Dock, and the DELTA Pro Ultra needs the Smart Home Panel 2 for panel-connected backup.
Bottom Line
The Anker SOLIX E10 is the stronger fit for a fixed, outdoor whole-home backup with big motor loads, high solar input and a built-in generator plan. The EcoFlow DELTA Pro Ultra is the stronger fit if you want the same 6,144Wh building blocks in a system that can also roll out the door. Start with your motor loads and where the system will live, and the choice usually makes itself.