![]() However, these batteries are one of the most expensive options, are inefficient to charge, and are offered by few U.S. ![]() Some customers prefer nickel-iron “Edison” batteries for their long lifespans, rated for up to 11,000 cycles, or 30 years of daily use. Nevertheless, these batteries boast longer cycle life, higher density, and improved resiliency, and they very well could begin to replace more traditional batteries in off-grid systems in the years to come. Lithium ion batteries such as Tesla’s Powerwall have been attracting considerable attention recently, but they require a high initial investment, compatible equipment is expensive and rare, and their track record in off-grid systems has not yet been proven. In 2017, homeowners can expect to pay between $3.00 and $4.00 per watt for their solar systems depending on region and various other considerations, pricing a 4.5 kilowatt system at around $15,500 and a 6 kilowatt system at around $20,000.Ī collection of batteries, or battery bank, is an essential component to any renewable off-grid system, and available batteries vary widely in price and expected lifespan. This can vary widely across the country and by season, but many online resources are available to determine this value for your location.Ī home in Southern California aiming to produce 450 kWh per month, half of the national average, would require a solar system size of 4.5 kilowatts, while a home in the northeast with similar energy demands would require a 6 kilowatt system.
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