When the grid goes dark, a whole-home solar generator keeps your fridge cold, your well pump running and your family calm.
EcoFlow Delta Pro Ultra — Top Pick
With 6,144Wh of storage, 7,200W of true 120/240V output, a ceiling up to 90kWh and a roughly 2-hour recharge, the Delta Pro Ultra is the most complete whole-home backup you can build around a solar generator.
In a hurry? That's our pick. Want the reasoning and the full comparison? Keep reading.
Picture a summer storm knocking out your power for three days. Your neighbors are hauling melted freezer food to the curb, and you are sipping coffee while your fridge hums along. That is the whole point of a whole-home solar generator: quiet, fuel-free backup that runs the stuff that actually matters.
But these units are a serious investment, and the spec sheets are packed with numbers that don't mean much until someone explains them. This guide walks you through watt-hours versus watts, 120/240V split-phase, expandable battery stacks and recharge speed, then names the four systems worth your money in 2026. Prices move fast on these, so always check current price before you buy.
Key Takeaways
- Watt-hours (Wh) measure how much energy you store; watts (W) measure how much you can run at once. You need both to run big.
- A true 120/240V split-phase output is what lets a generator power a well pump, dryer or central AC through your panel.
- Expandable battery stacks let you start smaller and grow to whole-home, multi-day capacity as your budget allows.
- The EcoFlow Delta Pro Ultra is our top pick for the highest ceiling and fastest recharge, expandable to 90kWh.
- For the best true 240V value, the Anker Solix F3800 delivers 6,000W native 240V at a friendlier entry price.
Watt-Hours vs Watts: The Two Numbers That Decide Everything
Here is the mistake almost everyone makes. They see "7,200 watts" and think that means the generator runs for a long time. It doesn't. Watts measure output, the rate of power flowing out right now, like the width of a pipe. Watt-hours (Wh) measure capacity, the total volume in the tank. A generator with huge watts but small watt-hours can run big appliances, but only briefly.
Do the math like this. Your fridge sips roughly 150W on average across a day. A 6,144Wh battery divided by 150W gives you about 40 hours of fridge time on a single charge, before you add any solar. Add a few LED lights, phone charging and a modem, and you still cruise through a long outage. Want to run a well pump that surges to 2,400W? You need enough watts to start it and enough watt-hours to keep it going.
So read both numbers together. High watts let you turn big things on. High watt-hours let you keep them on. A true whole-home unit gives you a healthy dose of each, plus solar input to refill the tank while the sun is up.
240V Split-Phase and Expandable Stacks: What Powers a Whole House
Most portable power stations only put out 120V. That is fine for a fridge and lights, but your well pump, electric dryer, water heater and central AC likely run on 240V. To power those through your home's electrical panel, you need a generator with true 120/240V split-phase output paired with a transfer switch or smart panel. This is the single feature that separates a "big battery" from an actual whole-home solution.
The other half of the equation is expandability. None of these units start at whole-home, multi-day capacity out of the box, and you would not want to pay for that all at once. Instead, they let you stack extra battery modules over time. Start with one battery to cover the essentials, then add capacity as your budget allows until you can ride out a multi-day outage without blinking. That flexibility is why we favor expandable systems over sealed one-and-done boxes.
Recharge speed matters too. When the sun does come out, a high solar input rating means you refill faster. And when you have grid power or a friend's outlet, fast AC recharging (the EcoFlow Delta Pro Ultra hits roughly a 2-hour full charge) means you top off between outage waves instead of waiting all day.
Quick Comparison
| Product | Capacity (Wh) | Output (W) | 240V | Expandable To |
|---|---|---|---|---|
| EcoFlow Delta Pro Ultra | 6,144Wh | 7,200W | Yes (120/240V) | 90kWh |
| Anker Solix F3800 | 3,840Wh | 6,000W | Yes (native 240V) | 26.9kWh |
| Bluetti AC500 + B300S | 4,960Wh | 5,000W | With adapter | 24.5kWh |
| Jackery Explorer 5000 Plus | 5,040Wh | 7,200W | Yes (native 240V) | 60kWh |
1. Delta Pro Ultra — Best Overall
EcoFlow Delta Pro Ultra
The Delta Pro Ultra is the closest thing to a real home backup system that still counts as a solar generator. Out of the gate you get 6,144Wh of storage and a 7,200W inverter with true 120/240V split-phase output, so it runs a well pump, dryer or central AC through your panel without an adapter workaround. That is exactly what whole-home backup demands.
What sets it apart is the ceiling. Stack batteries and inverters and you climb toward 90kWh, enough to run a typical home for days. Pair that with roughly a 2-hour AC recharge and heavy solar input, and you have a system that refills fast and scales as far as your budget goes. It is the most future-proof pick here.
Pros
- True 120/240V split-phase runs whole-home 240V loads
- Massive 7,200W output starts big appliances easily
- Expandable to a genuinely whole-home 90kWh
- Very fast ~2-hour AC recharge between outages
- Strong solar input to refill quickly on sunny days
Cons
- Highest entry cost of the group
- Full stacks get heavy and need real install space
- Overkill if you only want to back up a few essentials
2. Solix F3800 — Best Value
Anker Solix F3800
The Solix F3800 is the value champion for anyone who specifically needs true 240V. It delivers 6,000W of native 240V output from a single unit, which means it can drive a well pump or dryer straight away, no dual-unit pairing or clunky adapter required. For the price, that native split-phase output is hard to beat.
You start at 3,840Wh and expand with add-on batteries up to nearly 27kWh, which comfortably covers multi-day essentials for most homes. Anker's build quality is solid and the system plays nicely with home backup panels. If the EcoFlow's ceiling is more than you need, this is the smart-money choice.
Pros
- Native 6,000W 240V output from one unit
- Excellent price for true split-phase capability
- Expandable to a robust 26.9kWh
- Solid build quality and home-panel integration
- Good solar input for daytime recharging
Cons
- Lower base capacity than some rivals
- Peak ceiling is smaller than the EcoFlow
- Best value only if you truly need 240V
3. Bluetti AC500 — Best Expandability
Bluetti AC500 + B300S
The AC500 is a modular platform, not a fixed box, and that is its whole appeal. The head unit has no internal battery; you attach B300S packs to build the capacity you want. Start with one 4,960Wh setup and grow to 24.5kWh over time, spreading the cost across seasons instead of paying it all at once.
Its 5,000W inverter surges to a hefty 10,000W, so it starts stubborn motor-driven loads without tripping. True 240V needs an adapter pairing rather than native output, so it is a touch less plug-and-play than the Anker for whole-house 240V. But for pure expandability per dollar, the AC500 gives you the most room to grow.
Pros
- Modular design grows capacity as budget allows
- Huge 10,000W surge starts tough motor loads
- Expandable to a strong 24.5kWh
- Head unit and batteries can be replaced independently
- Wide solar input for fast daytime refills
Cons
- True 240V needs an adapter, not native output
- Head unit ships without any battery included
- More components to wire and manage
4. Explorer 5000 Plus — Best Simple Single Unit
Jackery Explorer 5000 Plus
If you want a lot of power without fussing over a stack of modules, the Explorer 5000 Plus is the straightforward answer. One unit gives you 5,040Wh of storage and a strong 7,200W output with native 240V, so it handles big appliances right out of the box. It is the easiest to understand of the four.
Jackery keeps the experience friendly, with a clean app and simple setup, and you can still expand toward 60kWh if you decide you want more later. It is not the cheapest 240V option, but for a big single unit that just works without a learning curve, it earns its spot.
Pros
- Big 5,040Wh from a single, simple unit
- Strong 7,200W output with native 240V
- Easiest setup and app experience of the group
- Still expandable up to 60kWh later
- Good solar input for daytime recharging
Cons
- Pricey for a single-unit 240V system
- Less modular flexibility than the Bluetti
- Recharge not as fast as the EcoFlow
Which Should You Choose?
Just want the best whole-home system, cost aside?
Go with the EcoFlow Delta Pro Ultra. It has the highest capacity ceiling (up to 90kWh), true 120/240V output, and the fastest recharge at roughly two hours. It is the most complete whole-home answer here.
Need true 240V without overspending?
The Anker Solix F3800 is your pick. Its 6,000W native 240V output runs well pumps and dryers directly, at a noticeably friendlier price than the EcoFlow, and it still expands to nearly 27kWh.
Want to start small and grow over time?
Choose the Bluetti AC500. Its modular head-unit-plus-battery design lets you buy capacity in stages up to 24.5kWh, spreading the cost while a 10,000W surge handles tough startup loads.
Ready to keep your lights on when the grid isn't?
The next outage is not a question of if, but when. Pick the system that fits your home and budget, and take back control of your power. Not sure where to start? Take the free Emergency Readiness Scan to see exactly what your household needs.
Take the Free Emergency Readiness ScanFrequently Asked Questions
For essentials like a fridge, lights, well pump and electronics through a multi-day outage, aim for at least 5,000-6,000Wh of storage plus true 240V output. To run larger 240V loads like central AC comfortably, plan to expand into the 10-20kWh range with stacked batteries.
Only if it offers true 120/240V split-phase output. The EcoFlow Delta Pro Ultra, Anker Solix F3800 and Jackery Explorer 5000 Plus provide native or built-in 240V; the Bluetti AC500 gets there with an adapter pairing. You will also need a transfer switch or smart panel to feed those circuits.
It depends on your load and capacity. A 6,144Wh battery runs an average fridge for around 40 hours before solar. Add solar input during daylight and you can extend that indefinitely in sunny weather, as long as your daily solar keeps pace with your daily use.
For simple plug-in backup of a few appliances, no. But to power your home's 240V circuits through the panel, you will want a licensed electrician to install a transfer switch or smart backup panel. That keeps the setup safe and code-compliant.
If you face regular outages or rely on a well, medical equipment or a home office, they pay for themselves in peace of mind and saved food. They run silent, need no fuel, and refill from the sun. Prices shift often, so check current price to see where each unit sits today.