The cost of a solar lithium battery module typically ranges from $400 to $1,500, depending on its capacity and quality. Factors influencing the price include brand, technology advancements, and warranties provided.
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Based on our previous sizing exercise, we determined the average Oahu household could install a 4 kW solar system for about $11,500 after incentives. Compared to paying $220 per month to HECO, that system would cut your bill by $110 monthly, or $1,320 per year.
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The average cost of solar panels ranges from $2. 50 per watt installed, with most homeowners paying between $15,000 and $35,000 for a complete system before incentives.
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This guide covers everything you need to know about solar costs, including average prices per watt, system size estimates, incentives, regional differences, and payback timelines. As of 2025, the average cost to install solar panels in California is around $2.
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