The 20-80 rule means keeping your battery's state of charge (SOC) between 20% and 80% instead of fully charging to 100% or draining to 0%. By avoiding extreme voltages, you reduce chemical stress inside the cells and significantly extend battery life.
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Solar panel installations typically cost between $13,962 and $27,924 in 2026. The actual price tag depends on your home's energy needs, roof characteristics, local incentives and other factors, all of which we'll break down in this guide.
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