Home backup power

Best Solar Generator for Home Backup

When the grid goes down, a solar generator keeps the fridge cold, the phones charged, and the CPAP running, then refills from the sun so a one-day outage does not turn into a crisis. These are portable battery units you plug your essentials straight into, no wiring and no fuel runs. Below are our top picks for 2026 and the buying logic to size one to your home.

How to buy a solar generator for home backup

Start by sizing to your critical loads, not your whole electrical panel. Make a short list of what you actually need during an outage: a fridge, a freezer, internet, a few lights, phone charging, and any medical gear like a CPAP. Add up the watts, multiply by the hours you want to cover, then add about 20 percent for inefficiency. That number, not the size of your house, is what tells you how big a unit to buy, and it usually lands above 2000Wh for a household.

Next, pay attention to switchover time if you have a desktop computer or sensitive medical equipment. The better units act as an uninterruptible supply with a transfer time under 30 milliseconds, fast enough that connected gear rides through the outage without rebooting. EcoFlow and Jackery units do this well. If all you are running is a fridge and some lamps, switchover speed matters less, but it is a real comfort for anyone working from home or relying on a machine overnight.

Then weigh recharge speed, because it is the difference between handling one outage and handling a multi-day event. Look for high AC input so the unit refills quickly the moment the grid flickers back on between storms, and enough solar input to sustain it through a long grid-down stretch when there is no wall power at all. A unit that recharges in an hour from the wall and accepts several hundred watts of solar gives you both safety nets, which is exactly what a real backup needs.

Finally, avoid the most common backup mistake: buying too small. People grab a 1000Wh unit because it is cheap and portable, then discover that a refrigerator alone eats most of it before morning. For genuine home backup, treat 2000Wh as the practical floor and lean toward 3000 to 4000Wh with an expansion battery if your area sees long or frequent outages. It is far cheaper to buy enough capacity once than to buy a too-small unit and a second one later.

Frequently Asked Questions

What size solar generator do I need for home backup?

Add up the watt-hours your essentials use during an outage. For a fridge, internet, lights, phones, and a CPAP, 2000Wh is the sane floor and gets most homes through a night. For a comfortable multi-day blackout you want 3000 to 4000Wh, ideally with an expansion battery so you can stretch it. The mistake people make is buying a 1000Wh unit for backup, then finding a fridge alone drains it overnight.

Can a solar generator power my whole house?

Only the large split-phase systems like the Anker SOLIX F3800 or EcoFlow DELTA Pro 3, paired with expansion batteries and a smart panel, get close to whole-home backup. Most people instead back up a critical-loads subset: fridge, freezer, internet, lights, and medical gear. That approach is far cheaper and still keeps you comfortable and safe through a storm, which is the real goal of home backup.

How many solar panels do I need to keep it charged in an outage?

Roughly match your daily use. If you draw about 2000Wh a day during an outage, you want around 400 to 600W of panels in good sun to replace what you use, and more in a cloudy region or a short winter day. During a grid-down stretch the panels are what turn a one-day battery into an indefinite one, so do not skip them if your outages can run long.

Will it keep my fridge cold all night during a blackout?

Yes. A typical home refrigerator uses around 1 to 1.5kWh over a full day, so any 2000Wh or larger unit holds a fridge overnight with margin to spare for lights and phones. Add an expansion battery and you can stretch that to several days. A solar panel during daylight keeps the battery topped up so the fridge never runs out, even in a long outage.

Do I need a transfer switch or can I just plug things in?

For most home backup you simply plug your fridge, devices, and a lamp straight into the unit's outlets, no electrician required. A transfer switch or smart panel only comes into play when you want the generator to feed your home's existing circuits automatically, which the SOLIX F3800 and DELTA Pro 3 support. Plug-and-run backup is the simplest path and covers the essentials that matter most in a blackout.