When the power goes out, you want a system that keeps the fridge running, your router connected, and the lights on—without hiring an electrician or blowing your budget on a $15,000 whole-home system. Two power stations dominate the home backup market right now: the EcoFlow Delta Pro 3 and the Anker SOLIX F3800. Both are premium LiFePO4 systems sold on Amazon, both offer 4,000+ Wh capacities, and both can be expanded. But they're different beasts: one prioritizes expandability and speed, the other offers dual-voltage output and raw power. We've done the watt math so you don't have to.
This guide compares real specs, runtimes, pricing, and what each system is actually best for. If you're trying to decide between these two, or wondering if either fits your homeowner situation, read on.
EcoFlow Delta Pro 3 wins if you want expandability, faster recharge, and a proven upgrade path—better for homeowners planning to grow their backup capacity over time. Anker SOLIX F3800 wins if you need 240V dual-voltage output right out of the box and don't mind the heavier unit—better for powering both standard 120V circuits and larger appliances. For most suburban homeowners, Delta Pro 3 edges ahead due to its LFP chemistry and lower maintenance costs over the battery's 4,000+ cycle lifespan.
EcoFlow Delta Pro 3
For most US homeowners, the Delta Pro 3's expandability, faster recharge time, and proven LFP chemistry make it the smarter long-term investment. You can add extra battery units later as your needs grow, and the warranty + cycle rating mean fewer replacement costs over 10 years. The 4,000-cycle LFP battery outlasts NMC chemistries by 2–3x.
Check today's price →Quick comparison
| Product | Best for | Key detail | Price |
|---|---|---|---|
| EcoFlow Delta Pro 3 | Expandable home backup, 120V households, future-proofing | 4096 Wh, 4000W, LFP, 4000 cycles, 114 lbs | about $2,400 (sales from $1,999) |
| Anker SOLIX F3800 | Dual-voltage homes, large appliances, high surge power | 3840 Wh, 6000W, LFP, 10+ year lifespan, 132 lbs | about $1,999–$3,500 (varies by retailer) |
Our picks, one by one
EcoFlow Delta Pro 3Best for expansion
The Delta Pro 3 offers 4,096 Wh of LFP capacity, 4,000W continuous output, and LFP chemistry rated for 4,000 full cycles (80% retention). That means you get ~4,000 recharge cycles before the battery drops to 80% capacity. Real-world math: charge it every other day for a backup system, and you're looking at 20+ years of use. It recharges from empty in 2–3 hours on wall power (7,000W multi-charge input), making it practical if you lose power and need to be ready the next day. The expansion ecosystem is the kicker—you can daisy-chain extra battery units later to build a 6–10 kWh system without buying a new power station. Dual-voltage expansion is available separately.
Check price & availability →Anker SOLIX F3800Best for dual-voltage
The Anker F3800 delivers 3,840 Wh in LFP chemistry with 6,000W AC output—that's 50% more surge power than the Delta Pro 3. The standout feature is dual 120V/240V output, which means you can run larger appliances or power transfer switches without an external converter. Solar recharge is fast: 2,400W dual-channel input (60V each) means full recharge in under 2 hours in good sun. Warranty is 5 years, and Anker claims 10+ year lifespan on the EV-grade LFP cells. The F3800 is expandable, but you're buying separate battery packs ($2,000–$2,500 each) rather than daisy-chaining to the main unit. For dual-voltage households or anyone planning to wire a solar array + transfer switch, this is simpler out of the box.
Check price & availability →EcoFlow Delta 2 MaxBudget alternative to Pro 3
If the Delta Pro 3's $2,400 sticker is a hard ceiling, the Delta 2 Max gives you the same expansion ecosystem at 1,600 Wh base (about $1,400–$1,600). It's lighter, cheaper, and you can add batteries later as your backup needs grow. Not ideal for whole-home backup alone, but excellent for fridge + lights + router + water heater pilot light.
Check price & availability →Jackery Explorer 3000 ProPortable alternative
The Jackery Explorer 3000 Pro delivers 3,024 Wh, 3,000W output, and weighs ~64 lbs (lighter than Anker F3800). It's a proven, portable option with Wi-Fi app monitoring. However, the NMC battery chemistry means you get roughly half the cycle life of LFP systems—expect replacement around 10–12 years vs 15–20 for LFP. It's a solid choice if portability between vehicles matters, but for stationary home backup, the Delta Pro 3's LFP advantage is worth the extra weight.
Check price & availability →The Core Difference: Expandability vs. Dual-Voltage
The EcoFlow Delta Pro 3 and Anker SOLIX F3800 are both home-grade backup systems, but they diverge on what they optimize for.
EcoFlow Delta Pro 3 is built for gradual expansion. You buy the base unit (4,096 Wh) and can add extra battery modules later—stacking capacity without replacing the whole system. The trade-off: 120V only at base, no native 240V (though you can buy a dual-voltage adapter separately). Recharge speed is faster (2–3 hours on wall power).
Anker SOLIX F3800 comes out of the box with 120V/240V dual-voltage output. If you have a transfer switch ready or want to power a large air handler, you don't need adapters. Solar input is also faster (2,400W dual-channel means under 2 hours to full charge in good sun). The trade-off: expansion means buying expensive separate battery units; there's no modular upgrade path like EcoFlow's.
For most suburban homeowners on 120V-only circuits, the Delta Pro 3 makes more sense financially. For homes wired with 240V circuits or planning a professional solar + transfer switch setup, the F3800 eliminates extra hardware costs.
Battery Chemistry: LFP vs. What You're Actually Getting
Both systems use LiFePO4 (LFP) chemistry, which is the safest lithium option for home use. LFP doesn't thermal runaway like NMC, and both come with multi-stage charging protection.
The real difference is cycle rating: EcoFlow rates the Delta Pro 3 at 4,000+ cycles at 80% capacity, while Anker claims 10+ year lifespan on the F3800 (not a specific cycle count, which is less transparent). In real-world terms, if you use your power station every other day, 4,000 cycles equals ~20+ years. Most homeowners will see 15–20 years of service from either system before considering a battery replacement.
For cost of ownership, the Delta Pro 3's published cycle rating makes it easier to calculate per-cycle cost (~$0.50–$0.60 per cycle, all-in). The Anker's 10-year claim is conservative but harder to verify. Choose Delta Pro 3 if you want published metrics; choose Anker F3800 if you trust Anker's lifespan claims and like the 240V flexibility.
Real Runtime: What Powers Your Fridge for How Long?
Let's do the watt math you actually care about.
A standard kitchen refrigerator consumes about 1,200–1,500 Wh per day (the compressor cycles on and off). With inverter losses and surge startup, expect ~80% real-world efficiency.
EcoFlow Delta Pro 3 (4,096 Wh): At 80% usable capacity (3,277 Wh effective), a fridge runs about 22–27 hours. That's a full day plus most of the next day before you need to recharge or add a battery module.
Anker SOLIX F3800 (3,840 Wh): Similar math yields 20–25 hours of fridge runtime on 80% usable capacity (3,072 Wh effective). Slightly shorter, but close enough that the difference is negligible if you're also running lights and router.
For a two-day outage without recharge: add a battery expansion to either system, or run the power station + solar panels. With 400W solar input, both systems can trickle-charge while you're drawing power, extending runtime indefinitely in daytime outages.
Weight, Portability, and Where You'll Put It
The EcoFlow Delta Pro 3 weighs 114 lbs; the Anker F3800 weighs 132 lbs. Both are stationary systems for your garage, basement, or shed—not something you'll move often.
If you need portability for RV camping or job sites, neither is ideal (look at smaller Jackery or EcoFlow models under 50 lbs instead). But for a home backup system that stays in one place, the extra 18 lbs doesn't matter. Both have wheels or handles for setup. Choose based on footprint if your space is tight: the Delta Pro 3 is slightly more compact, but the difference is marginal.
Warranty and Long-Term Support
EcoFlow Delta Pro 3: 5-year standard warranty, 10-year battery guarantee in some markets. EcoFlow's app-based support is solid, with regular firmware updates. Parts are available through Amazon and EcoFlow's website.
Anker SOLIX F3800: 5-year warranty, 10-year lifespan claim. Anker's support is responsive, but the F3800 is newer, so long-term parts availability is less proven. That said, Anker has strong supply chains and Amazon distribution.
Both are major brands. If warranty and support matter, both are equal. The tiebreaker: EcoFlow has a longer track record with large portable power stations, so spare parts are easier to find online. Anker is catching up fast.
When You Should NOT Buy Either System
Your home is all-electric with a heat pump: Heating a home during an outage requires 5–15 kW; neither 4 kWh system will run your heat pump for more than 15–45 minutes. Talk to a licensed electrician about a whole-home battery (Tesla Powerwall, Generac PWRcell, Enphase) or a dedicated transfer switch with manual load-shedding (keep fridge + lights only).
You want to power a whole-home HVAC system or electric range: Air handlers draw 3–5 kW startup; ranges draw 5–14 kW. Neither power station can deliver that without a transfer switch and careful load management. Cost: $1,500–$3,000 for a licensed electrician to install a proper transfer switch. Not included in these prices.
You expect to run this during a multi-day grid outage without solar: Recharge these units from wall power only. If the grid is down for 3+ days, you need a solar array (400W+ recommended) daisy-chained to recharge during the day. Both systems support solar input; budget $1,500–$3,000 for panels.
You have a medical device like a CPAP: CPAPs draw 30–60W continuously (or 50–150W on heated humidifier mode). Neither system's lifespan specs account for continuous medical-grade duty cycles. Talk to your sleep doctor and equipment supplier about dedicated medical-grade battery backup.
Price and Value: Which Saves You Money?
EcoFlow Delta Pro 3: $2,400 MSRP, often $1,999–$2,299 on sale. Cost per Wh: ~$0.49–$0.59.
Anker SOLIX F3800: $1,999–$3,500 depending on retailer (list price $3,999). Cost per Wh: ~$0.52–$0.90.
On pure price per watt-hour, the Delta Pro 3 wins when on sale. The Anker is cheaper in absolute sticker price only at select retailers. Neither is cheap, but both deliver 4,000+ Wh of LFP capacity without the $15,000 price tag of a whole-home installer system.
If you're buying today, check Amazon for current Delta Pro 3 deals (price fluctuates weekly). The Anker is more stable at $1,999–$2,500 range. For long-term value, the Delta Pro 3 edges ahead because expansion costs less (daisy-chain vs. separate packs) and the LFP cycle rating is published and transparent.
Frequently asked questions
Can I run a whole-home backup without an electrician?
Not safely. Both systems need a transfer switch to safely isolate your home from the grid (prevents backfeeding and electrocution risk). A licensed electrician must install this; cost is $1,500–$3,000. These power stations plug into the outlet afterward, but the switch installation is non-negotiable.
Will either system run my air conditioner?
Not alone. Central AC draws 3–5 kW on startup and 2–3 kW running. Even the 4 kWh station would be depleted in 1–2 hours. Window units draw 1–2 kW and are slightly more feasible, but plan for short runtime (2–4 hours per charge). If cooling matters during outages, focus on a transfer switch + load management (fridge, lights, one A/C unit) plus solar recharge.
How often do I need to replace the battery?
LFP chemistry lasts 15–20 years in typical use (every other day charging). The Delta Pro 3's 4,000-cycle rating at 80% retention means you get ~4,000 full recharge cycles before battery degrades to 80% capacity. Most homeowners won't replace the battery in their lifetime of ownership. If you do, expect to spend $800–$1,200 for a replacement LFP pack, but this is rare.
Can I charge from my rooftop solar without a converter?
Both systems accept solar input directly (the built-in charge controller steps down solar voltage safely). You don't need a separate inverter for solar charging. However, if you want to run AC loads AND charge from solar simultaneously, ensure the solar array is 400W+ to provide meaningful charging while you draw power. Your electrician can help size this.
Which is easier to expand later?
EcoFlow Delta Pro 3 is easier. You buy extra battery modules and daisy-chain them to the main unit (cheaper expansion). Anker F3800 requires buying separate, expensive battery packs that don't scale as neatly. If you might expand capacity in 2–3 years, Delta Pro 3 is the better long-term choice.
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