Learn how to store your excess solar energy for nighttime use and power outages.
Most grid-tied solar systems do not require a battery if your state has a strong Net Metering policy. However, batteries are essential if you want backup power during blackouts or if your utility company has unfavorable Time-of-Use (TOU) rates.
The standard for modern home energy storage (e.g., Tesla Powerwall, Enphase IQ Battery). They are compact, lightweight, and have a deep Depth of Discharge (DoD), meaning you can use most of their stored energy without damaging them.
A specific, highly stable chemistry of Lithium-ion. They are incredibly safe, do not succumb to thermal runaway easily, and boast a massive cycle life (often lasting over 10 years with minimal degradation). They are rapidly becoming the preferred choice for solar storage.
The oldest, most affordable technology. However, they are bulky, require regular maintenance (for flooded types), and have a very low Depth of Discharge (typically around 50%). They are mostly used in off-grid cabins rather than modern residential setups.
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