Deep Cycle Batteries
Deep cycle batteries provide the consistency needed for comfortable off-grid living. They are the center of every off-grid solar (or wind or hydroelectric) system. Most renewable energy sources produce electricity instantaneously - but intermittently. The sun sets, the wind stops, the stream dries up - so you need batteries to store what went unused of that instantaneous power so you'll have it for later.
Everything comes and goes from the battery bank, so your batteries will be working hard. You can help protect your batteries by regulating their charge with a charge controller and overcurrent protection and keeping tabs on them with a system monitor, but they do wear out over time. Real Goods has built renewable energy systems since 1978 using all kinds of batteries, and today we carry what we consider the industry's best for deep-cycling, off-grid use.