best solar generator for whole house (2026)
No portable solar generator can truly power an entire house the way your utility does. What they CAN do is power the circuits that matter most — fridge, lights, router, furnace fan, some outlets — during an outage. For that job, the EcoFlow Delta Pro Ultra (6,144Wh expandable to 90kWh) is the current ceiling. For most homeowners, a Bluetti AC300 + 2× B300 configuration (6,144Wh, ~$4,500) or an EcoFlow Delta Pro with an expansion battery (~$5,000) handles essential circuits for 24-48 hours at a realistic cost. For true whole-house backup — including central AC and electric heat — you need a gas standby generator or a permanent battery installation like a Tesla Powerwall.
I need to start this one with some honesty: the phrase "whole house solar generator" is mostly marketing. A typical American home uses 28-30 kWh (28,000-30,000 watt-hours) per day. Even the largest portable solar generators max out around 12,000-25,000 Wh before you start stacking multiple units. You do the math: a "whole house" solar generator running normal loads runs out of power in less than a day.
That doesn't mean these systems are useless. They're excellent at one specific thing: powering the circuits you actually need during an outage. That's a different goal than "running my house exactly the way the grid does," and once you stop expecting the latter, the technology gets interesting.
Here's the honest breakdown.
the math problem
Let's look at what a typical American house actually uses:
| Appliance | Watts (running) | Daily Use (hours) | Daily kWh |
|---|---|---|---|
| Refrigerator | 150W cycling avg | 24 | 1.5–2.0 |
| Central AC (3-ton) | 3,500W | 4–8 (summer) | 14–28 |
| Electric water heater | 4,500W | 2–4 | 9–18 |
| Electric dryer | 3,000W | 0.5–1 (avg) | 1.5–3 |
| Electric oven | 3,000W | 0.5–1 (avg) | 1.5–3 |
| LED lights (whole house) | 100–200W | 4–6 | 0.5–1.2 |
| TV + electronics | 100–300W | 4–6 | 0.5–1.8 |
| Microwave | 1,200W | 0.25 | 0.3 |
| Furnace blower (winter) | 500W | 8–12 | 4–6 |
| Well pump (if applicable) | 1,500W surge / 500W run | 0.5 | 0.25 |
Add it up. A typical summer day with AC running: 25-35 kWh. A typical winter day without heavy heating loads: 15-25 kWh. A house with electric heat in winter: 40-60 kWh.
Now look at the biggest solar generators:
- EcoFlow Delta Pro (single unit): 3.6 kWh
- Bluetti AC300 + 4× B300: 12.3 kWh
- EcoFlow Delta Pro Ultra (single inverter): 6.1 kWh
- EcoFlow Delta Pro Ultra (max expansion): 90 kWh
Only the top-of-the-ladder expanded systems approach a full day of normal household use. And those systems cost $15,000-$30,000+. At that price, you're in Powerwall territory.
reframing the goal
Instead of "power my whole house," the right question is "power the circuits I need during an outage." Those circuits usually are:
- Refrigerator and freezer (keep food from spoiling)
- A few lighting circuits (safety, comfort)
- Internet router and modem (communication, work)
- Furnace blower or window AC (climate control in extreme weather)
- Some outlets for device charging and small appliances
- Well pump (if you have one — critical for water)
- Sump pump (if you have one — critical for basement)
Add it up and most homeowners need 3,000-8,000Wh per day to keep these circuits running. That's well within the range of a large solar generator, especially one with solar panels refilling the battery each day.
What you DON'T run during an outage on solar alone:
- Central AC (too much runtime)
- Electric water heater (too much daily load)
- Electric dryer (you can hang clothes)
- Electric oven (use a microwave or propane grill)
- Pool pump, hot tub, EV charging, etc.
This is the mental shift. Once you accept that solar generators are for essentials-only backup, the products actually deliver on their promise.
our picks for essentials backup
best overall: ecoflow delta pro + extra battery
Capacity: 7,200Wh (3,600Wh base + 3,600Wh expansion battery)
AC output: 3,600W continuous, 4,500W with X-Boost
Solar input: 1,600W max
Total weight: ~200 lbs across two units
Price: ~$5,000-$6,000 base config with panels
For most homeowners, this is the setup that hits the sweet spot for essential-circuit backup. 7,200Wh is enough to run fridge, lights, router, furnace blower, and device charging for roughly 36-48 hours without recharging — and with 1,200-1,600W of solar panels, you can keep the system topped off indefinitely in good weather.
The 3,600W continuous output handles a shallow well pump on startup surge, a small window AC, and simultaneous use of multiple circuits. The EcoFlow X-Stream fast charging lets you fill the battery from shore power in about 2 hours if the grid comes back briefly during a multi-day outage.
Can be paired with the EcoFlow Smart Home Panel 2 (separate purchase) for automatic circuit-level backup — essentially turning the Delta Pro into a whole-home essentials battery with automatic cutover.
What I like:
- 7,200Wh covers essentials for 36-48 hours at a reasonable price.
- Further expandable to 25,000Wh if you want more runway.
- Pairs with the Smart Home Panel 2 for automatic cutover to essential circuits.
- Fast wall charging means you can top off during brief grid returns.
- UPS mode keeps computers and sensitive electronics online through the switchover.
What I don't love:
- 200 lbs total is a commitment. Not moving this around easily.
- Can't run central AC.
- Smart Home Panel 2 adds $1,500-$2,000 to the total cost for automatic integration.
check price on the EcoFlow Delta Pro
best for serious backup: bluetti ac300 + 2× b300
Capacity: 6,144Wh (2× B300 batteries)
AC output: 3,000W continuous, 6,000W surge
Solar input: 2,400W max
Total weight: ~205 lbs across three units
Price: ~$4,500-$5,500 with panels
If you want the highest solar input in this class, the Bluetti AC300 system is it. 2,400W of solar input versus 1,600W on the Delta Pro means 50% faster recharging during daylight hours. For essentials backup where you want to minimize the drain on the battery during daytime, that solar advantage is meaningful.
The modular design also lets you grow — add a third or fourth B300 battery later to reach 9,216Wh or 12,288Wh without buying a new inverter. And paired with a second AC300 through the Fusion Box P030A, the system can deliver 240V split-phase for well pumps, deep water pumps, or limited central AC use.
What I like:
- 2,400W solar input is the highest in this class — best daytime recharging.
- Modular expansion up to 12,288Wh without replacing the inverter.
- Pairs for 240V operation via Fusion Box — handles deep well pumps and some central equipment.
- Replaceable batteries — any one can be serviced independently.
What I don't love:
- Bluetti's app is less polished than EcoFlow's.
- Multi-unit setup means more cables and more floor space.
- 3,000W continuous is lower than the Delta Pro's 3,600W.
the nuclear option: ecoflow delta pro ultra
Capacity: 6,144Wh per inverter (expandable to 30,720Wh per inverter, 90kWh with 3 units)
AC output: 7,200W continuous, 21,600W peak (single inverter)
Solar input: 5,600W max (single inverter)
240V: Yes (single unit, no coupling box needed)
Price: $6,000-$30,000+ depending on configuration
If you want a portable solar generator that can actually run a significant portion of a normal house — including 240V loads like a central AC or an electric water heater — the Delta Pro Ultra is the current ceiling of what's possible in this category. 7,200W continuous output from a single inverter is double any other unit on the market. And it does 240V natively without needing a second unit and a coupling box.
Fully expanded (3 inverters + maximum batteries), a Delta Pro Ultra system can store 90 kWh — enough to run a normal household for 2-3 days without recharging, and with 15 kW+ of solar, essentially indefinitely in good weather.
The price is eye-watering. A base Delta Pro Ultra system is around $6,000. A fully expanded 90 kWh setup runs $25,000-$35,000 — right in the zone where you should be seriously comparing it to a permanent Tesla Powerwall or Enphase battery installation, or a Generac whole-home standby generator.
What I like:
- True whole-house capability in a single portable unit.
- Native 240V output — no coupling box required.
- 7,200W continuous handles central AC and electric water heaters.
- Expandable to 90 kWh — genuinely enters Powerwall territory.
What I don't love:
- Price. At fully expanded config, you're paying close to Powerwall pricing.
- Weight and size — no longer really "portable" at max expansion.
- Complexity. This is a serious system that requires planning, not a grab-and-go backup.
check price on the EcoFlow Delta Pro Ultra
when you should buy a standby generator instead
Let me be straight: for true whole-house backup during extended outages, a gas or propane standby generator is still the more practical tool.
A 22kW Generac standby generator with automatic transfer switch and a 500-gallon propane tank runs $12,000-$16,000 installed. It runs your whole house — AC, water heater, dryer, oven, everything — indefinitely as long as you have fuel. During a 5-day hurricane outage, it keeps the fridge running, the AC on, and the house normal.
A solar generator equivalent in capability — a fully expanded Delta Pro Ultra system — costs $25,000-$35,000 and still can't match the standby generator's runtime in cloudy weather.
Where solar wins: silent operation, no fuel cost, no maintenance, safe indoors, works during fuel shortages. Where gas standby wins: longer runtime, true whole-house loads, proven reliability during extended outages.
The honest answer for most people is a hybrid setup: a mid-size solar generator for daily backup and short outages (anything under 48 hours), plus a gas standby for hurricane-grade events. The solar handles the frequent inconvenience. The standby handles the emergencies. Read our generator vs battery backup guide for the full comparison.
what i'd buy in each situation
- Suburban home, frequent short outages, essentials only — EcoFlow Delta Pro with one expansion battery (7,200Wh total) + 1,200W of solar panels. ~$5,500. Covers essentials for 36-48 hours. Pairs with EcoFlow Smart Home Panel 2 for automatic cutover.
- Rural home with well pump, medium-length outages — Bluetti AC300 + 2× B300 + Fusion Box P030A for 240V capability. ~$5,500-$7,000. Handles well pump and essentials.
- Modern home, want maximum capability in one portable unit — EcoFlow Delta Pro Ultra base unit + solar panels. $6,000-$10,000. The highest-capability single-unit option.
- Budget-conscious, need basic backup — EcoFlow Delta Pro (just the base unit, 3,600Wh) + 400W solar panels. ~$4,300. Handles essentials for 24 hours per charge.
- True whole-house backup with central AC, multi-day outages — Buy a 22kW Generac standby generator, not a solar generator. $12,000-$16,000 installed. It's the right tool.
related
For a broader look at solar generators for smaller use cases, see best solar generator. If you're weighing solar vs. gas standby, read generator vs battery backup. For full-home gas standby options, see best whole home generator. And for the head-to-head between the two biggest modular battery systems, read EcoFlow Delta Pro vs Bluetti AC300.
Some links on this page are affiliate links. We may earn a commission at no cost to you. I run a hybrid setup at my own property — a mid-size solar kit for daily use and a Generac standby for hurricane-grade events. See our affiliate disclosure.