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Discover the Power of Tesla Powerwall 2
Best Battery Warranty of 2023
Tesla is a popular manufacturer of solar batteries. Its Powerwall 2 model is commonly in the Texas solar marketplace. The Powerwall 2 is suitable for use on cloudy days, at night, during grid outages, or to offset time of usage (TOU) electricity rates.
It’s backed by a solid warranty, but it is priced at the higher end of the batteries reviewed for 2023.
Battery Capacity
The Powerwall 2 has a storage capacity of 13.5 kilowatt-hours (kWh) given it is coupled with a solar array that has adequate sunlight and production capabilities. The Powerwall 2 is able to provide a full day’s energy back up during cloudy conditions or low/limited light on winter days. During the bright summer, the Powerwall 2’s may power your home for up to 2.5 days.
A system serviced by two Powerwall 2s may result in an additional 12 hours during low light conditions. On sunny days, adding a second Powerwall 2 may allow an additional 72 to 96 hours of capacity.
To go off grid permanently, the average Texas home would require 3 or more Powerwall 2 batteries. Tesla allows you to connect a maximum of 10 Powerwall 2s in a single residential storage system.
Chemistry
Tesla engineered the lithium-ion based Powerwall 2 using a common Lithium Nickel Manganese Cobalt Oxide chemistry also known as NMC.
The Powerwall 2 is a compact, high-capacity battery with a service life of approximately 12 years.
Depth of Discharge
As discussed at the top of this section, DoD expresses in percentage how much power can be drawn from a battery in comparison to the maximum it holds. Solar batteries are made to be charged, discharged, and recharged. However, over the years, the more often this cycle repeats, the more impact it will have on the lifespan of the solar battery
In an attempt to minimize this effect, many manufacturers limit DoD percentage to extend a battery’s useful service life. DoD's industry standards range between 80% and 100%.
The Tesla Powerwall 2 is rated as a 100% DoD, meaning you are free to charge, discharge and recharge as often as needed and still not fall below the 70 % mark for ten years.
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Power Output
Continuous power is a measurement, expressed in kW, of a battery's potential to release a sustained energy for a given period. Peak power is a measurement, expressed in kW, of a potential maximum power output in short bursts.
The Powerwall 2 provides 10 kW of peak power and 5.8 kW of continuous power.
Round-trip Efficiency
In order for a battery to function, a small amount of electric power is required for its operation. The total amount of charge that comes out of a battery subtracted from the amount of charge that went into the battery is expressed as a percentage ('%'). This is called Round-trip Efficiency.
The U.S. Energy Information Administration, assesses average round-trip efficiency at approximately 80%. The Tesla Powerwall 2 demonstrates a round-trip efficiency of 90%, well above average.
System Compatibility
The Tesla Powerwall 2 is compatible with most common solar inverters brands on the market.
Warranty
The Powerwall 2 comes with a 10 year, unlimited cycle warranty and a 4-year workmanship warranty covering any repairs, replacement parts, shipping, and installation related issues. Tesla guarantees the Powerwall 2 will have 70% of its original 13.5 kWh capacity, at the end of the tenth year. Tesla offers what may be the strongest battery warranty available in 2023.
