VANPOWERCALC

LiFePO4 Battery Guide for Campervans

Complete guide to sizing LiFePO4 lithium batteries for your campervan. Calculate your ideal capacity in minutes.

LiFePO4 lithium batteries have become the gold standard for van builds. Lighter, longer-lasting, and more usable than AGM — but sizing them correctly is key to getting your money's worth.
⚡ Expert tip
When your LiFePO4 is new, do a full charge-discharge cycle and measure actual capacity with a battery monitor. Note the result. Re-measure yearly. When capacity drops below 80% of original, plan replacement within 18 months. This gives you early warning without being caught off-guard by sudden failure.

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Comparison table

LiFePO4 modelCapacityBMSAppPrice
Victron Smart 200Ah200Ah✓VictronConnect$900-1,200
Battle Born 100Ah100Ah✓—$900-1,000
Renogy 200Ah200Ah✓Renogy BT$600-750
Ampere Time 200Ah200Ah✓—$450-550

About this tool

LiFePO4 Battery Guide for Campervans: Everything You Need to Know

LiFePO4 (lithium iron phosphate) has become the dominant battery chemistry for campervan builds over the past 5 years. This guide covers everything you need to use LiFePO4 safely and effectively.

Why LiFePO4 is the Right Choice for Campervan Builds

LiFePO4 is not just better than AGM — it is fundamentally different in ways that matter for van life:

Factor LiFePO4 AGM Practical Difference
Usable capacity 80% DoD 50% DoD LiFePO4 doubles usable energy per Ah
Weight 10-13 kg/100Ah 27-33 kg/100Ah LiFePO4 is 60% lighter
Cycle life 3,000-5,000 300-500 10× longer lifespan
Charge voltage 14.2-14.6V 14.4-14.8V Slightly lower, BMS regulated
Temperature: below 0°C Cannot charge Can charge (degraded) BMS protects LiFePO4 automatically
Self-discharge 2-3%/month 3-10%/month LiFePO4 stores better
Safety Very stable (no thermal runaway) Risk of H₂ gas LiFePO4 is the safest lithium chemistry

Understanding the BMS (Battery Management System)

Every LiFePO4 battery needs a BMS. Quality branded batteries (Battle Born, Renogy, Victron) include it internally. BMS functions:

  • Cell balancing: keeps individual cells at equal voltage
  • Overcharge protection: disconnects if voltage exceeds 14.6V
  • Over-discharge protection: disconnects when cells drop below 2.5V
  • Overcurrent protection: disconnects or limits on shorts or excessive draw
  • Temperature protection: prevents charging below 0°C

Charging Requirements for Campervan LiFePO4

Your charging equipment MUST support a LiFePO4 charging profile:

  • Solar MPPT: set to LiFePO4 mode (Bulk 14.4V, Absorption 14.4V, Float 13.5V)
  • DC-DC charger: must support LiFePO4 profile (some older B2B chargers do not)
  • Inverter-charger: configure for LiFePO4 (Victron MultiPlus: battery type = Lithium)
  • No equalization charging — LiFePO4 does not need it and it will damage cells

Wiring Multiple LiFePO4 Batteries

Connecting two or more LiFePO4 batteries in parallel works well if they are identical (same brand, same production batch):

  • Use equal-length cables to each battery (within 5%) to ensure equal current sharing
  • Use a busbar rather than daisy-chaining batteries
  • Ensure each battery has its own fuse

Never mix old and new batteries or different capacities.

Lifespan and Replacement Timing

At 1 cycle per day (common in regular van life use), 3,000 cycles = 8.2 years; 5,000 cycles = 13.7 years. In practice, most LiFePO4 batteries will outlast your campervan build.

Expert tip: When your LiFePO4 battery is new, do a full charge-discharge cycle and measure actual capacity with a battery monitor (Victron BMV-712 or BMV-700). Note the measured capacity. Re-measure every year. When it drops below 80% of original, plan for replacement within the next 12-18 months.

Frequently asked questions

Is LiFePO4 safe in a campervan?▼
Yes — LiFePO4 is the safest lithium chemistry. Unlike NMC and NCA (used in laptops and EVs), LiFePO4 is thermally stable and extremely unlikely to cause fires or thermal runaway. It does not produce toxic gases. The BMS provides additional overcurrent, overvoltage, and temperature protection.
Can LiFePO4 be charged while driving?▼
Yes. Use a DC-DC (B2B) battery-to-battery charger that supports LiFePO4 profile. The B2B charger takes current from the alternator/vehicle battery and charges your LiFePO4 at a controlled, temperature-monitored rate. Standard split-charge relays are not suitable for LiFePO4 charging.
Can I store a LiFePO4 battery over winter?▼
Yes easily. Store at 50-60% state of charge in a cool (5-20°C), dry location. LiFePO4 self-discharges only 2-3% per month. A battery stored at 50% in October will still be at 40-45% by March — no damage, no maintenance needed.
Do I need a battery monitor with LiFePO4?▼
Strongly recommended. Unlike AGM where voltage roughly indicates state of charge, LiFePO4 voltage stays very flat from 100% to 20% SoC. A shunt-based battery monitor (Victron BMV-700, Renogy RNG-BT-RVR30) is the only accurate way to know how much energy you have left.

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