Tesla Motors launched late Thursday its Tesla Energy brand with a line of batteries designed for homes, businesses and utilities.

“The obvious problem with solar power is that the sun doesn’t shine at night,” the company founder and CEO Elon Musk said in a press conference in California. “We need to store the energy to use at night.”

But he added “the issue with existing batteries is they suck.”

Musk launched the Powerwall home battery, a rechargeable 7-10 kwh lithium-ion battery, priced at $3,000-$3,500 for installers, with deliveries slated in three to four months. It’s available in a selection of colors.

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