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. Read our Sonnen battery review for more details. The typical efficiency rating of batteries we looked at was at least 90%. The EcoLinx is also the least efficient battery we reviewed, with a round-trip efficiency of 81.60%. The downside is the EcoLinx is significantly more expensive than other batteries we looked at, costing more than $30,000 before installation. Purchasing a Sonnen battery also means you'll be eligible to participate in the Sonnen VPP, a virtual power plant program that can help lower your electricity bill and bring more renewable energy to the power grid. This battery offers plenty of extra bells and whistles too, including smart home energy automation, energy tracking, smart weather forecasting and more with the Sonnen app. The Sonnen EcoLinx has an incredibly high depth of discharge rating (the amount of energy you can draw from the battery all at once without causing damage) at 100% and has a decent on-grid continuous power output (how much power a battery can output at all times) of 7.2kW. Every other battery we looked at had a warranty of less than 12 years, and with batteries all facing a limited lifespan, the exceptional warranty on the EcoLinx set it apart. Both EcoLinx models include an outstanding 15-year, 15,000-cycle warranty. You can also go with the EcoLinx 30, which holds up to 30kWh. This means your battery capacity is extremely flexible. The EcoLinx 1.5 holds between 12 and 20kWh and allows you to upgrade your battery capacity in increments of 2kWh by inserting a battery module into the battery cabinet, instead of installing an entirely new battery. The main difference between the two is the battery capacity. Sonnen offers two models of the EcoLinx: the EcoLinx 1.5 and the EcoLinx 30. Instead, we evaluated solar batteries based on manufacturer product data sheets, publicly available online manufacturer data and our own carefully crafted research process and methodology. The batteries featured on this page were not selected based on any hands-on tests - solar batteries, like other solar system components, are large and integrated into your home's energy system, making testing difficult. We looked at more than a dozen batteries, and here are our picks for the top products to consider. With the right solar setup, it's even possible to live completely off the power grid. Solar batteries are useful for avoiding expensive time of use rates, decreasing your reliance on the power grid, protecting yourself from power outages and using solar energy to power your home at night. So what can you do with this extra energy? Sell it to the power company (via net metering) or stash it away in a solar battery to use for later. When your solar panels are performing at their best, they might generate more electricity than you need. How we evaluated the best solar batteries.
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