Determining whether to invest in additional solar panels or more battery storage depends on individual utility tariff structures and primary energy goals. If your local utility offers net metering with favorable 1:1 export credits, adding more solar panels to maximize generation and grid credits is usually more cost-effective. Conversely, if your utility utilizes strict time-of-use rates, frequent peak-hour pricing, or unreliable grid infrastructure subject to regular blackouts, investing in additional battery storage provides greater financial savings and energy resilience.