Should I use a deep cycle battery in my RV?
Yes, deep cycle batteries are essential for RVs due to their ability to discharge 50–80% of capacity repeatedly without damage. Unlike starter batteries designed for short bursts, deep cycle variants (like LiFePO4 or AGM) provide steady power for lights, appliances, and solar systems. For example, a 12V 100Ah LiFePO4 battery supports 1.2kWh usable energy, ideal for overnight camping. Pro Tip: Pair with a compatible solar charger to maximize cycle life.
Best Deep Cycle Battery for RVs
Why are deep cycle batteries suited for RVs?
Deep cycle batteries excel in long-term energy delivery, handling daily discharge-recharge cycles. Their thicker plates and durable chemistry (e.g., LiFePO4) withstand 3,000+ cycles at 80% depth of discharge (DoD), unlike car batteries that degrade below 50% DoD.
RVs require sustained power for refrigerators, lighting, and inverters—tasks demanding deep cycling. For instance, a 12V 200Ah AGM battery can run a 50W fridge for ~24 hours. Pro Tip: Lithium batteries offer 95% efficiency vs. 80% for lead-acid, reducing solar recharge time.
What’s the lifespan of RV deep cycle batteries?
Lifespan varies by chemistry: LiFePO4 lasts 5–10 years (3,000–5,000 cycles), AGM 3–6 years (500–1,000 cycles), and flooded lead-acid 2–4 years (200–500 cycles). Proper maintenance (e.g., avoiding full discharges) extends longevity.
For example, a LiFePO4 battery cycled daily to 80% DoD retains 80% capacity after 3,500 cycles. Temperature also matters—operating above 35°C halves lead-acid life. Pro Tip: Use a battery monitor to prevent over-discharge, the #1 cause of premature failure.
| Chemistry | Cycle Life | Cost per kWh |
|---|---|---|
| LiFePO4 | 3,000–5,000 | $400–$800 |
| AGM | 500–1,000 | $200–$400 |
How to size a deep cycle battery for an RV?
Calculate total daily watt-hour usage (appliance watts × hours), then divide by battery voltage. Add 20% buffer for inefficiencies. A 1,200Wh/day load requires a 12V 150Ah battery (1,200Wh ÷ 12V × 1.2 = 150Ah).
Consider peak loads: Inverters may draw 2,000W+ briefly, requiring batteries with high surge tolerance. For solar compatibility, lithium handles partial states of charge better. Pro Tip: Oversize by 30% if boondocking—cloudy days demand reserve capacity.
Fasta Power Expert Insight
FAQs
No—starter batteries degrade rapidly under deep discharges. Use only deep cycle variants rated for RV/marine applications.
How often should I recharge my RV battery?
Recharge when hitting 50% DoD for lead-acid, 80% for lithium. Letting AGM drop below 50% permanently reduces capacity.
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