Form SB—01 · Battery profile
Sonnen evo
Sonnen is a German company, and the evo is built the way that reputation suggests. Its standout number is the warranty: 15,000 cycles, the longest in the category. If you intend to own your home and your battery for the long run, that figure is the whole argument.
Why we like it
A battery's cycle warranty is a fair proxy for how long the manufacturer expects it to last. At 15,000 cycles, the evo is rated for well over a decade of daily use before meaningful capacity loss, which is longer than anything else here. The build quality matches: tight tolerances, careful thermal management, and the kind of engineering discipline German manufacturing is known for. For a homeowner who treats a battery as a 15-year decision, the evo is the obvious pick.
Who it's right for
- Homeowners optimizing for the longest possible lifespan
- People who plan to stay in their home for the long term and want the battery to outlast the loan that paid for it
- Buyers who value engineering quality and are willing to pay for it
Where it falls short
The evo is the most expensive battery per kWh in our lineup, and at 10 kWh per unit it is also one of the smaller ones, so whole-home backup usually means more than one. Sonnen's US service network is smaller than Tesla's or Enphase's, which is worth weighing if you live outside a major metro. The premium is real. Whether it is worth it depends on how long you plan to keep the battery.
How it compares
Against the Powerwall 3, the evo trades a larger service network and lower price for a far longer cycle warranty. Against the Enphase IQ Battery 10C, the two are close on capacity, and the decision is ecosystem versus longevity. Against the FranklinWH aPower 2, the evo is smaller and pricier but rated to last longer. We weigh that against your actual plans for the home.
Compare the rest of the lineup: Tesla Powerwall 3, Enphase IQ Battery 10C, FranklinWH aPower 2, Franklin Home Power 2, or see all battery brands.