The best home solar batteries of 2026, plug-in and hardwired

It can be, if your utility offers time-of-use rates: the battery charges with cheaper off-peak electricity overnight and powers your home at peak times instead. Work it out: kWh shifted per day × (peak rate − off-peak rate) × 365, minus around 10% for charging losses. With an example gap of 10¢ per kWh, shifting 8 kWh a day is worth about $290 a year, or roughly $260 after losses. Compare that with the installed price divided by the warranty years.

Size it to your evening and overnight use, not your total daily consumption, because that's the part a battery covers. Your utility's app or online account may show your usage by the hour: add up what you use from about 4 p.m. to 7 a.m., for example. If that's 6 kWh, a battery with 6 to 8 kWh of usable capacity is a sensible start. With solar panels, don't buy more than they can refill in winter, and check the power rating in kW too.

Possibly, but programs and rebates change often and depend on where you live, so check current federal, provincial and utility programs before you buy. Some programs only cover professionally installed systems, so a battery you buy online and install yourself may not qualify. Read the conditions before you sign, and make sure any rebate or incentive your installer promises appears clearly on the quote.

If you're installing solar and a battery together, a hybrid inverter is usually simpler and slightly more efficient; if you already have solar, an AC-coupled battery is the easier retrofit. A hybrid inverter stores solar power without converting it twice, but replacing a working inverter just to add a battery rarely makes sense. An AC-coupled battery has its own inverter and connects to your electrical panel, leaving the existing solar system untouched. Either way, ask whether it can also charge at off-peak rates.

Only if it has a backup function and has been wired for it; most grid-connected batteries switch off during an outage, just like solar inverters. Backup setups use a transfer switch that isolates your home from the grid, then power either a few essential circuits or the whole house. Switchover can take a moment, so check this if you rely on medical equipment. Set a minimum charge in the app to keep in reserve for outages.