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SunPower unveils details of a battery pilot for the first time

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Solar maker SunPower is pulling back the veil (a bit) on a long-discussed plan to sell batteries in conjunction with its solar panels.

On Tuesday SunPower provided more details about a pilot project it’s running in California with home builder KB Homes. SunPower and KB Homes will provide a solar panel and battery combo product to new home owners in the cities of Irvine, El Dorado Hills, and San Diego.

The pilot project is small at this point. Sunpower doesn’t expect “more than a handful of homes in three KB Home communities will include the technology” this year, according to a company spokesperson. But next year it sees potential for a broader rollout to additional homes and communities. SunPower is also piloting solar and battery combos in Germany and Australia.

Image of energy storage and solar panels, courtesy of SunPower.
Image of energy storage and solar panels, courtesy of SunPower.

SunPower said it’s testing out lithium ion battery technology from several companies to provide the storage part, but it wouldn’t disclose which vendors it’s working with. The company also wouldn’t comment on the cost of the systems to customers in the trial.

Clearly SunPower’s battery plans are at an early stage. But just the fact that SunPower is moving forward with this strategy highlights how the market for pairing solar panels and batteries is truly starting to emerge. Batteries can enable homeowners with solar panels to store the sun’s energy during the day, to be used at night, or at other times of the day when using grid energy is expensive. SunPower said its battery goals are about giving its customers total energy management options, as well as more control over their energy costs.

The barrier to this market has long been the high cost of the batteries. But with new business models — like SolarCity’s lease programs — and lower cost battery technologies, lithium-ion batteries are starting to become a more reasonable options for a home energy storage system.

SolarCity panels, image courtesy of SolarCity.
SolarCity panels, image courtesy of SolarCity.

Some day the market for solar and batteries will be huge. Navigant Research predicts that worldwide revenue from residential distributed generation (solar and other generation technologies) plus energy storage will grow from $52.7 billion annually in 2014 to $71.6 billion in 2023.

Solar financier and installer (and soon to be manufacturer) SolarCity has been one of the leading faces of pairing solar panels with batteries. Its relationship with Tesla (through Elon Musk and investors) has enabled it to pair Tesla batteries with the solar panels it sources. SolarCity is already selling batteries and solar panels to WalMart stores and Tesla has said it will use a portion of its batteries from its future gigafactory for grid storage.

Other companies in the U.S. eying this market include One Roof Energy, which is working with battery maker Silent Power to roll out products. Korean conglomerate Hanwha Group, which runs a solar panel manufacturing subsidiary, is an investor in both OneRoof and Silent Power. SunEdison has done a pilot project with a battery system from startup Seeo.

6 Responses to “SunPower unveils details of a battery pilot for the first time”

  1. Shakawat Hossen

    Solar energy is cheaper and cleaner than regular utility energy. To install a solar power system in California, Oregon, Colorado, and Arizona; No hesitation !!!

    SolarCity can install a solar power system on your home for free and sell you the energy it produces for less than you currently pay. This is your chance to save for years to come.

    for more information about solar for your home click here:

  2. Kris Kuehl

    I’ve got the BEST solution! Better than SOLAR. My name is Kris Kuehl. I am merely one man. I don’t want your money. I c r e a t e d “Independent Energy”. I want to give you my invention that you can make too. There’s no patent on it. First one to get a patent shall be the inventor. I just want the world to accept my gift for free. It only cost me about 777.00 dollars to make. It generates free electricity forever, without the need for oil, gasoline, friction, pollution, a supercollision, NOR IRAN. Somebody tell Tesla to start engineering “living” cars using my technology, to save themselves from building charging stations.
    Here’s How:
    1. A 12amp car battery from wal-mart
    2. A power inverter to plug step 3 into it.
    3. A skilsaw circular saw that spins at least 3600 rpms. If the powersaw is too loud, try to get a quiet electric motor but you’ll need to get an online 40amp tractor battery to power it, and it would have to be pulley driven, unless we can all convince leeson motors to bore a 5/8 inch thread hole in the axle.
    4. A 5/8 inch axle bolt.
    5. A generator head from part no. 165913 or 165928 for dryers and house needs.
    6. A battery recharger from wal-mart.
    Simply link those components together in that order and back into the battery, and everyone shall have infinite free electricity. PLEASE visit my website to see video evidence. I also have other SIGNIFICANT scientific discoveries there. Bless you, and I hope you have a very casual day!

    Kris Kuehl please come…

  3. Since the economic viability of solar power is inextricably linked with battery storage, selling and maintaining both to a given home/business owner seems logical would probably increase sales by giving consumers a total “solar solutions” option.