Buying Guide · Updated July 2026
Best Solar Generators for Home Backup (2026)
Home backup is the highest-stakes use case for a solar generator — you need enough capacity and AC output to keep essentials running through a multi-hour or multi-day outage. Here's how to size one correctly, and which high-capacity units we recommend.
Wattage Sizing Table for Common Outage Scenarios
Size your generator to surge watts, not just running watts — compressors and motors (fridges, sump pumps, AC units) spike 2–3x on startup. If your generator's peak AC output can't cover the surge, the appliance won't start at all.
| Appliance | Running Watts | Surge Watts | Runtime on 1,000 Wh |
|---|---|---|---|
| Refrigerator / freezer | 100–250W | 600–1,200W | ~5–8 hrs |
| Sump pump (1/3 HP) | 800–1,050W | 1,300–2,500W | ~1 hr |
| CPAP machine | 30–60W | None | ~16–30 hrs |
| Wi-Fi router + modem | 10–20W | None | ~2+ days |
| Window AC unit | 500–1,400W | 1,500–2,800W | ~1–2 hrs |
| Furnace fan / blower | 300–600W | 800–1,500W | ~2–3 hrs |
Figures are typical ranges based on manufacturer/EnergyStar data, not measurements of a specific appliance model. Runtime estimates assume ~85% inverter efficiency and do not account for other loads running simultaneously.
Gas Generator vs Solar Generator for Home Backup
If you're comparing a traditional gas generator against a solar generator for the first time, the choice isn't as straightforward as "solar is better." Each has clear advantages depending on your outage scenario:
| Factor | Solar Generator | Gas Generator |
|---|---|---|
| Fuel / Runtime | Unlimited with solar panels; limited battery without recharge | Runs as long as you have gas; requires fuel storage |
| Noise | Dead silent (no moving engine parts) | 50–70 dB — loud enough to disturb neighbors |
| Emissions | Zero — safe to run indoors | CO — never operate indoors or near windows |
| Power Output | Typically 300–6,000W continuous | Typically 1,000–12,000W+ continuous |
| Maintenance | None — no oil, filters, or spark plugs | Regular oil changes, carburetor care, fuel stabilizer |
| Upfront Cost | Higher per watt ($500–$5,000+) | Lower per watt ($300–$3,000) |
| Portability | Portable models exist; large units are heavy | Wheel kits common; heavy but movable |
Our take: For short outages (under 24 hrs) where you mainly need fridge, lights, and device charging, a solar generator is the better choice — silent, zero emissions, and no fuel to store. For extended multi-day outages or whole-house power involving central AC or well pumps, a gas generator (or dual-fuel inverter) is still more practical. Many homeowners keep both: a solar generator for daily essentials and emergency overnight quiet, and a gas generator for extended outage backup.
How to Calculate Your Home Backup Power Needs
Sizing a home backup solar generator starts with one question: what do you absolutely need to keep running during an outage? Not what you'd like to run — what you must run. Here's a step-by-step method:
- List your essential appliances. Typically: refrigerator, router/modem, phone charging, a few LED lights, and one medical device (CPAP, oxygen concentrator, etc.). Optionally: a sump pump, furnace fan, or well pump depending on your home and season.
- Find the running watts and surge watts for each. Check the appliance nameplate or use the table above as a guide. Running watts are what the device draws during normal operation; surge (startup) watts are the brief spike when a motor or compressor starts.
- Add up the running watts of everything you'd run simultaneously. This number tells you the minimum continuous AC output you need from the generator.
- Identify the single largest surge in your list and add it to your total running watts. This tells you the peak output the generator must handle — if it can't cover the surge, that appliance won't start.
- Estimate your daily watt-hour needs. Multiply each appliance's running watts by the hours per day you'll run it. A fridge running 8 hours/day (cycling) at 150W = 1,200 Wh. Add everything up for your total daily Wh budget. That number should be less than your generator's rated capacity to avoid running the battery flat before the outage ends.
Example: A typical partial-home backup scenario — fridge (150W × 8h = 1,200 Wh), router (15W × 24h = 360 Wh), LED lights (20W × 6h = 120 Wh), CPAP (50W × 8h = 400 Wh) — totals roughly 2,080 Wh/day. A 2,000 Wh unit like the Jackery Explorer 2000 Plus covers this tightly for one day; a 4,096 Wh unit like the EcoFlow Delta Pro 3 gives you two full days without recharging. Add solar panels and you can extend indefinitely.
Transfer Switch, Extension Cords, or Direct Plug-In?
How you connect your solar generator to your home during an outage depends on your comfort level, budget, and whether you want to power hardwired circuits (like a well pump or furnace) or just plug-in appliances:
Extension Cords (Simplest, No Installation)
Run heavy-gauge extension cords from the generator's AC outlets directly to your fridge, router, lights, and other plug-in devices. This costs nothing beyond the cords and works for any portable generator. The downside: cords running through your home and limited to devices with standard plugs.
Transfer Switch (Best for Hardwired Circuits)
A licensed electrician installs a manual transfer switch (typically $400–$800 including installation) that lets you select a few circuits — fridge, well pump, furnace — to run from the generator. This is cleaner, safer, and lets you power hardwired appliances. Some large solar generators (EcoFlow Delta Pro 3, Anker SOLIX F3800 Plus) support 240V split-phase output for transfer switch connection.
Direct Plug-In (Generac-Style Inlet Box)
An inlet box installed on your home's exterior lets you plug the generator into your panel via a generator interlock kit (also requires an electrician). This is the fastest way to power multiple circuits without extension cords but requires careful load management to avoid overloading the generator.
Important safety note: Never plug a generator directly into a wall outlet (backfeeding) — it's dangerous and can electrocute utility workers. Always use a transfer switch or interlock kit installed by a licensed electrician for panel-level connection.
Our Picks, In Detail
Jackery Explorer 2000 Plus
Expandable to 24kWh — scales from RV power to full home backup on the same base unit.
Capacity
2,042 Wh
AC Output
3,000 W
Solar Input
1000 W
▶ Show pros & cons
Pros
- Expandable from 2,042 Wh to 24 kWh
- 6,000W surge handles most home appliances
- LiFePO4 with long cycle life
- Good value for an expandable system
Cons
- Base unit alone may not cover whole-home needs
- Expansion batteries are expensive
- Heavier and bulkier than comparable units
Who This Is For
Homeowners who want to start with essentials-only backup and expand capacity over time as budget allows.
Bluetti Elite 200 V2
High-capacity mid-tier pick with fast 50-minute charging and strong solar input.
Capacity
2,074 Wh
AC Output
2,600 W
Solar Input
1200 W
▶ Show pros & cons
Pros
- 50-minute AC fast charging
- 1,200W solar input for quick solar recharge
- 2,073 Wh capacity suits partial-home backup
- Relatively compact for its capacity
Cons
- No expansion port for add-on batteries
- Premium price for the capacity
- Proprietary solar connectors
Who This Is For
Households needing fridge + lighting + router backup without full whole-home capacity.
EcoFlow Delta Pro 3
Best whole-home backup capacity with expandable batteries and 4,000W AC output.
Capacity
4,096 Wh
AC Output
4,000 W
Solar Input
1600 W
▶ Show pros & cons
Pros
- 4,096 Wh capacity for serious backup coverage
- 4,000W continuous / 4,000W surge AC output
- Expandable battery system
- 240V split-phase for transfer switch wiring
Cons
- 128 lbs — not easily movable
- Very expensive upfront investment
- Overkill if you only need partial backup
Who This Is For
Homes wanting to cover a well pump or sump pump alongside the fridge and essentials during multi-hour outages.
Anker SOLIX F3800 Plus
Expandable whole-home system with massive 6,000W output and industry-leading solar input.
Capacity
3,840 Wh
AC Output
6,000 W
Solar Input
3200 W
▶ Show pros & cons
Pros
- 6,000W AC output — highest in this lineup
- 3,200W solar input — fastest solar recharge
- 3,840 Wh capacity with expandability
- Industry-leading solar input speed
Cons
- 154 lbs — essentially stationary once placed
- Highest price point in this guide
- Requires significant solar input to fully utilize
Who This Is For
Larger homes or anyone wanting near-whole-home coverage with room to add a second appliance circuit.
Need More Power?
Looking for Whole-Home Backup?
If you need to power a well pump, central AC, or your entire home through a transfer switch, our whole-home solar generator guide covers $3,000+ systems with 120/240V split-phase output and 5–90 kWh expandable capacity.
View Whole-Home Guide → ★ Emergency Award Winner →More Buying Guides
★ Best Overall 2026
EcoFlow Delta Pro 3 wins the top award.
★ Best for Emergencies
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Premium $3K+ systems for full-house backup.
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Best Under $500
Budget-friendly picks.
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EcoFlow Delta Pro 3 Review
Full review of our top home backup pick.
Anker SOLIX C1000 Review
Fast-charging mid-range power station.
Written by Morgan Chen · Updated · Power & Energy Editor
Frequently Asked Questions About Home Backup Solar Generators
What size solar generator do I need for home backup?
For fridge + lighting + router, 1,000–2,000 Wh is typically enough for a day. For a well pump, sump pump, or multiple appliances running simultaneously, look at 3,000+ Wh with 3,000W+ AC output. Use the step-by-step calculation method above to determine your specific needs.
Can a solar generator run my whole house?
Only with expandable systems in the 6,000+ Wh range paired with a transfer switch, and even then typically not simultaneous HVAC plus everything else. Most home units are sized for essentials — fridge, lights, router, medical devices — not whole-house simultaneous load. If you need full whole-home backup, a gas generator or a dedicated home battery system (like Tesla Powerwall) is a more realistic solution.
Do I need an electrician to install a home backup solar generator?
For simply plugging appliances into the unit's AC outlets or running extension cords, no — that's plug-and-play. If you want it wired into your home's electrical panel via a transfer switch or interlock kit to power hardwired circuits (well pump, furnace, ceiling lights), yes — that requires a licensed electrician. Never attempt panel wiring yourself.
How long can a solar generator power a fridge during an outage?
A 1,000 Wh unit can typically run a standard fridge (150–250W with a compressor duty cycle of roughly 30–40%) for about 5–8 hours before needing a recharge. Larger 3,000+ Wh units can extend that to 24 hours or more. Adding solar panels lets you run a fridge indefinitely as long as the sun is adequate.
Is a solar generator better than a gas generator for home backup?
It depends on your outage scenario. Solar generators are silent, emissions-free, and require no fuel storage — ideal for short outages and overnight use. Gas generators produce more power for longer and cost less upfront, but require fuel, maintenance, and ventilation. Many homeowners keep both: a solar generator for daily essentials and quiet overnight running, and a gas generator for extended multi-day outages.
Can I use a solar generator during a power outage without solar panels?
Yes. A solar generator works like a large battery bank — you can pre-charge it from a wall outlet before the outage, and it will power your devices until the battery runs out. Solar panels let you extend runtime indefinitely by recharging during the day, but they're not required for the generator to function. If you expect a multi-day outage, solar panels are strongly recommended.
Will a solar generator run a well pump or sump pump?
It depends on the pump's starting surge. A 1/3 HP sump pump draws 800–1,050W running but surges to 1,300–2,500W on startup. You'll need a generator with at least 2,500W peak output to start one reliably. Well pumps vary widely — a shallow well pump might need 1,500–3,000W surge, while deep well pumps can exceed 5,000W. Check your pump's nameplate before buying.
How do I maintain a solar generator if I only use it during outages?
Storage maintenance is minimal. Store the unit at 50–80% charge in a cool, dry place (40–80°F). Every 3–4 months, check the charge level and top it up to 80% if it's dropped below 50%. LiFePO4 batteries degrade far less during storage than NMC lithium, which is another reason to choose LFP for backup use.