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Sealed Gel Cell Batteries

Gel cell batteries use sealed cells for versatile, low-maintenance off-grid power storage. Like AGM batteries, sealed gel cell batteries' typical applications are for off-grid utility backup or vacation cabins since they're deep cycle and there's no watering needed. A gel cell battery tends to have a bit longer cycle life than an AGM, but the trade-off is that it is more limited in its ability to deliver peak power. This means you may be able to get away with a smaller battery bank if you choose AGMs.

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"In many ways, batteries are safer than traditional AC power. It's not impossible, but it's pretty difficult to shock yourself with the low-voltage direct current (DC) in the 12- or 24-volt battery systems we commonly use."

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

Sealed Deep Cycle Gel Cell Batteries from Real Goods