When 12-volt batteries are used in pairs they must be wired in parallel.
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Six-volt batteries must be installed in pairs wired in series so their combined voltage will be 12. Related video: RV Battery Maintenance Techniques for Extending RV Battery Life Some larger coaches have either one pair of large six-volt batteries wired in series, or even two pairs of six-volt batteries wired in series/parallel to deliver 12 volts with enough wattage when running the coach from the batteries. Typically, smaller coaches will have one or two 12-volt batteries wired together in parallel to provide 12 volts to the electrical system. They can be mounted on their sides, and are costlier than gel or wet cells, but last considerably longer and are maintenance-free. They cost more and typically last longer than wet-cell batteries.ĪGM batteries also don’t require water, as their electrolyte is soaked into fiberglass matting which is wrapped around their lead plates. Gel batteries contain a thick jelled electrolyte instead of liquid, so they don’t spill if briefly tipped on their side, and don’t require refilling with water. Wet batteries also need regular terminal cleaning.
Wet batteries use more water in hot weather and when frequently discharged and recharged, so service them more frequently in these conditions. If batteries run low on water and electrolyte to the point where plates are exposed, they may be ruined. These “wet” cells require periodic filling with water which should be distilled to prevent mineral buildups. Li-Ion batteries are maintenance free, extremely light, and provide far more power storage for a given size and weight, but they are still too costly for most RVers.įlooded-cell batteries are often installed as original equipment, and deliver good capacity at a relatively low price. Lightweight lithium-ion (li-Ion) batteries are starting to enter the market.
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