RV BATTERY SIZE & SELECTION GUIDE
Compare Group 24, Group 27 And Group 31 LiFePO4 Batteries
Find the right lithium battery for your RV by comparing enclosure dimensions, capacity options, terminal positions, charging compatibility and Smart BMS requirements.
Application positioning only. Group size does not establish a capacity ranking.
02 / COMPARE THE PLATFORMS
Battery group size is a starting point for installation fit. Actual battery dimensions, capacity, terminal arrangement and electrical specifications must be verified for the selected model.
| Specification | Group 24 | Group 27 | Group 31 |
|---|---|---|---|
| Battery platform | Group 24 LiFePO4 enclosure option | Group 27 LiFePO4 enclosure option | Group 31 LiFePO4 enclosure option |
| Physical dimensions Length × Width × Height | Confirm with model datasheet | Confirm with model datasheet | Confirm with model datasheet |
| Capacity options | 100Ah configuration | 100Ah / 120Ah configurations | 100Ah / 120Ah configurations |
| Nominal voltage | 12.8V | 12.8V | 12.8V |
| Nominal energy | 1,280Wh at 100Ah | 1,280Wh at 100Ah 1,536Wh at 120Ah | 1,280Wh at 100Ah 1,536Wh at 120Ah |
| Battery weight | Confirm with model datasheet | Confirm with model datasheet | Confirm with model datasheet |
| Terminal position | Confirm with model datasheet | Confirm with model datasheet | Confirm with model datasheet |
| Continuous BMS discharge current | Confirm with model datasheet | Confirm with model datasheet | Confirm with model datasheet |
| Smart BMS communication options | Confirm with model datasheet | Confirm with model datasheet | Confirm with model datasheet |
| RV installation considerations | Check tray footprint, hold-downs and cable clearance. | Balance enclosure fit with the selected energy and current ratings. | Verify available tray space, terminal access and the selected electrical ratings. |
Scroll horizontally on smaller screens. Nominal energy is calculated from 12.8V × rated Ah.
03 / CHOOSE AN INSTALLATION PLATFORM
Match the available installation space to your energy and current requirements, then review the appropriate platform below. Browse AI Smart RV Batteries to compare model-specific configurations.
01 — GROUP 24
Start here for space-conscious RV installations. Check tray fit, retaining hardware and terminal clearance. For a model-specific configuration example, review the 12V 100Ah Group 24 Smart LiFePO4 RV Battery.
Explore Group 24 Lithium Batteries02 — GROUP 27
Evaluate this platform when balancing available tray space with house-battery energy and current requirements.
Explore Group 27 Lithium Batteries03 — GROUP 31
Review the enclosure drawing and electrical ratings when considering a Group 31 replacement or a new RV power system.
Explore Group 31 Lithium Batteries04 / MEASURE BEFORE SELECTING
Before replacing a lead-acid battery with LiFePO4, compare the available battery compartment space with the complete mechanical drawing of the selected lithium battery.
Measure usable battery tray length, including housing projections and mounting restrictions.
Confirm battery body width, retaining straps and side clearance.
Allow space for battery terminals, protective covers, cable bends and the compartment lid.
Verify positive and negative terminal locations, polarity, cable reach and connector requirements.
Check battery mounting, service access and model-specific installation requirements.
05 / ENERGY, LOAD AND OPERATING TIME
Enclosure size answers “will it fit?” Capacity and power demand answer “how long can it run?” Use both checks when selecting a LiFePO4 battery for an RV.
NOMINAL ENERGY CALCULATION
Nominal Energy (Wh) = Nominal Voltage (V) × Capacity (Ah)
12.8V × 100Ah = 1,280Wh
12.8V × 120Ah = 1,536Wh
Illustrative nominal energy calculations, not measured usable energy or runtime guarantees.
For a steady AC load, an initial estimate is: runtime ≈ nominal energy × assumed available-energy fraction × inverter efficiency ÷ AC load power. Include other loads separately and check the selected battery’s limits.
A high-capacity battery can still be unsuitable if its BMS current rating cannot support the required power.
06 / MATCH THE ELECTRICAL RATINGS
Add simultaneous DC loads and inverter battery-side demand. Check both continuous BMS limits and allowable cable, connector and protection ratings.
Review inverter surge power, motor startup loads and the battery’s permitted peak current and duration. A peak rating is not a continuous rating.
Confirm LiFePO4 charging voltage, combined charging current and operating temperatures. Verify converter, solar and alternator charging equipment separately.
Use only arrangements approved for the selected models. Confirm battery matching, BMS behavior and wiring requirements before changing system voltage or capacity.
Use the RV Lithium Battery Compatibility Guide for charging and integration checks. For a chemistry change, review RV Lead Acid To Lithium Battery Replacement.
07 / SELECT THE CONNECTED FEATURES
Select battery intelligence, app access and system interfaces independently of enclosure size.
Selected configurations provide runtime estimates, abnormal drain alerts, battery health insights and One-Tap Smart Troubleshooting for battery diagnostics and guided solutions. These functions do not perform physical battery repair.
View SOC, voltage, current and temperature through a compatible mobile app.
Connect compatible RV equipment through validated communication protocols. Confirm the equipment model, firmware and interface requirements before integration.
Feature availability depends on the battery model, BMS hardware, firmware and app configuration. Explore Smart BMS & AI RV Battery Technology for supported monitoring and integration options.
08 / SPECIFY THE COMPLETE BATTERY
For a new RV platform or private-label program, define the installation envelope and electrical requirements together. An OEM review can cover enclosure format, terminal arrangement, capacity, BMS limits and communication interfaces.
Finalize the mechanical drawing, electrical datasheet and interface requirements for the same model. Avoid mixing specifications from different battery platforms. Request model-specific datasheets and mechanical drawings for engineering review.
Explore RV Battery OEM & Private Label Solutions09 / TECHNICAL QUESTIONS
Practical answers for comparing enclosure formats, energy ratings and RV system requirements.
The group designation is a starting point for physical fit. Compare the selected batteries’ dimensions, terminals, rated capacity and BMS current. A larger group reference does not guarantee higher amp-hours or longer runtime.
No. TUORDE Group 27 and Group 31 platform options both include 100Ah and 120Ah configurations. Compare model-specific capacity and nominal energy rather than ranking batteries by group number.
No. Housing details, terminal height and mounting features can differ between models. Use the complete mechanical drawing and measure the available battery compartment before choosing a replacement.
Multiply nominal voltage by rated capacity. A 12.8V 100Ah battery has 1,280Wh of nominal energy, while a 12.8V 120Ah battery has 1,536Wh. Usable energy and runtime depend on the selected model and operating conditions.
No. Also compare voltage, physical fit, continuous and peak discharge capability, charging limits and operating temperature. For batteries with different voltages, watt-hours provide a clearer energy comparison than amp-hours alone.
Follow the selected model’s installation instructions. Include space for terminals, protective covers, cable bends, retaining hardware and service access. There is no universal clearance value that fits every battery enclosure and RV compartment.
Estimate battery-side current from inverter output power, battery voltage under load and inverter efficiency. Then verify continuous demand, startup surges, other DC loads and the selected battery’s BMS limits. The final configuration must be checked against the equipment specifications.
Group size does not determine charging settings. Verify the selected LiFePO4 battery’s charging voltage, current limits and temperature requirements against the converter, solar controller and alternator charging equipment.
TUORDE supports OEM reviews for battery housings, terminal arrangements, capacity, BMS configuration and communication options. Bluetooth, CAN and RS485 availability depends on the selected configuration and validated equipment protocols.
FROM FIT CHECK TO BATTERY SELECTION
Share your compartment dimensions, energy demand, inverter loads and charging equipment. TUORDE engineers can help review the right LiFePO4 battery platform and configuration.
For RV manufacturers, distributors, upfitters, installers and system integrators.
