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Why are solar batteries so expensive?

08/14/2021

By “solar batteryI assume you mean batteries for homeowners which store electricity from rooftop solar panels during the day for use later after the sun sets. Such batteries cost much more than the $100/kWh we often hear quoted for EVs. There are three main reasons for this:

  1. Cycle de vie. An EV with 300 mile range only needs a battery to last 800 full charge/discharge cycles to deliver a 240,000 mile operating life. To provide 15 years of daily service a home battery system must survive 5000 cycles. That costs extra.
  2. The car battery price only includes the battery pack itself, or often just the cells. A home battery price includes an inverter, often a cooling system, consumer interface software and hardware, etc..
  3. Wholesale vs. retail. Carmakers buy thousands (soon millions) of battery systems per year. You are buying one, or perhaps a few.

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