What batteries should I use for my RV?
For RVs, lithium-ion (LiFePO4) batteries are optimal, offering 3,000–5,000 cycles, 95%+ depth of discharge (DoD), and 50–60% weight savings over lead-acid. AGM batteries suit budget builds but provide only 500 cycles at 50% DoD. Always size capacity to your RV’s daily kWh draw (e.g., 200Ah LiFePO4 ≈ 2.56kWh usable).
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What battery chemistries work best for RVs?
LiFePO4 dominates for longevity and efficiency, while AGM fits low budgets. Flooded lead-acid is outdated due to maintenance and venting risks.
LiFePO4 operates at 12.8V nominal with a near-flat discharge curve, sustaining 13V until 90% DoD. AGM drops from 12.8V to 11.5V at 50% load, triggering inverters to shut off prematurely. Practically speaking, a 100Ah LiFePO4 delivers ~1280Wh usable vs. AGM’s ~600Wh. Pro Tip: Pair LiFePO4 with a compatible BMS to prevent cell imbalance. For example, a 300W RV fridge running 8 hours daily needs 300Wh—a 100Ah LiFePO4 handles this for 4+ days, while AGM lasts 2 days.
| Chemistry | Cycle Life | Cost per kWh |
|---|---|---|
| LiFePO4 | 3,000–5,000 | $600–$900 |
| AGM | 500–800 | $200–$300 |
How do I calculate my RV’s battery needs?
Sum all DC/AC loads (watts) multiplied by runtime (hours), then add 20% buffer. Lithium handles deeper discharges, reducing required capacity.
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Start by listing devices: fridge (150W), lights (50W), inverter (200W standby). Multiply each by hours used (e.g., fridge runs 24h: 150W × 24h = 3.6kWh). Total daily ≈ 5kWh. At 12V, 5kWh ÷ 12V ≈ 417Ah. With lithium’s 95% DoD, you’d need 417Ah ÷ 0.95 ≈ 440Ah. AGM’s 50% DoD doubles this to 834Ah. But what if you add solar? A 400W solar panel generates ~2kWh/day in sun, cutting battery needs by 40%. Pro Tip: Use a battery monitor (e.g., Victron BMV-712) to track real-time consumption.
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FAQs
Yes, but upgrade your charger to a lithium profile (14.2–14.6V absorption). Lead-acid chargers peak at 14.8V, which risks tripping lithium BMS overvoltage protections.
Do lithium RV batteries work in freezing temps?
Most can’t charge below 0°C, but our models include self-heating pads, enabling -20°C charging. Discharge is safe down to -40°C.
Is a 12V or 24V system better for large RVs?
24V cuts amperage by half, reducing wire gauge needs and inverter losses. Use 24V if your system exceeds 3000W.
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