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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.

SAVE ON SHIPPING - Pick your Centennial, Fullriver, Relion, Rolls, Trojan, and US Battery batteries up FREE at one of over 40 locations in the Western US

"Batteries are like the muscles of your body - they need some exercise to stay healthy, but not too much or they get worn out at an early age. We've found it's best to aim for 3-5 days' worth of battery storage. Less than three and your system will be cycling the battery deeply too frequently, which will shorten the batteries' life."

Solar Living Sourcebook 14th Edition
Chapter 4: From Panel to Plug

calculatorFor help sizing your PV system, use our online Solar Load Calculator