Step 1: Calculate Your Actual Energy Needs
Before you buy anything, you need to know how much power you actually use. Track your usage for one trip.
Related: 12V vs 24V vs 48V Guide
Step 2: Choose Your System Voltage
12V — Best for small RVs, van conversions
24V — Best for medium RVs, moderate loads
48V — Best for full-time living, large systems
Step 3: Size Your Battery Bank
Weekend Warrior: 80% DoD, add 20% buffer
Full-Time Living: 50% DoD, 1000Ah+ recommended
Learn more: Battery Lifespan Guide
Step 4: Check Your Charging System Compatibility
LiFePO4 has different charging requirements than lead-acid. Key specs:
- Bulk/Absorption voltage: 14.4V-14.6V
- Float voltage: 13.5V-13.8V
- Charge current: Up to 100% of capacity
See: Charging Guide
Step 5: Physical Size and Weight
LiFePO4 is 60% lighter than lead-acid. A 100Ah LiFePO4 weighs just 10-13 kg vs 30-35 kg for lead-acid.
Step 6: BMS Features That Matter
Must-have BMS features:
- Over-charge protection
- Over-discharge protection
- Cell balancing (active preferred)
- Temperature protection
Learn: BMS Explained
Step 7: Buyers Checklist
- Daily Wh consumption calculated
- System voltage chosen
- Battery capacity sized with buffer
- Charging system compatible
- Physical dimensions fit compartment
- Quality BMS with cell balancing
TL;DR
- Calculate daily Wh → convert to Ah → divide by DoD
- Choose voltage based on system size
- Size battery with 20% buffer
- Verify charger compatibility
- Check physical fit
- Get quality BMS with active balancing
Need help? Contact NeBuQuic