![]() The battery warranty guarantees 10 years, up to 70% of the battery's original capacity (by end of warranty) and unlimited cycles. The real standout with the Tesla Powerwall is the warranty. The Powerwall has a 90% round-trip efficiency, 100% depth of discharge (which is higher than average) and an on-grid peak power output of 7kW and 5kW continuous. ![]() Everything about the Powerwall's performance is decent, too. One battery holds 13.5kWh, which is decent. The Tesla Powerwall ranked average in just about every category, and that's OK. Solar plus the right amount of storage can also make a comfortable off-grid life possible. Once you've got a battery full of clean electricity, you can use it to avoid peak charges under time of use rates, decrease your reliance on your utility, use solar energy at night or have a reliable source of energy during a blackout. Your utility might pay you for that energy via net metering, but you can also use it to charge a battery to use later. If you've got rooftop solar panels, they might produce more energy than you can use. Another battery might suit your home and individual energy needs much better. Even though the Tesla Powerwall doesn't have many glaring weaknesses, (aside from Tesla's poor customer service reputation) every battery is different. But it's important to remember that batteries aren't a one-size-fits-all product. It's also one of only two batteries we've seen that includes an unlimited-cycle warranty. This makes it more likely to be a solid option for more homes. The Powerwall earned an average score in nearly every category, making it the most well-rounded solar battery we've scored. ![]() The Tesla Powerwall is CNET's pick for the best overall solar battery.
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