Daily DC loads
Lighting, vent fans, water pump, USB-C devices and a compressor refrigerator are best served directly from the DC bus.
RV POWER / ENGINEERED HOUSE BATTERIES
Stay longer. Power everything that matters.
LiFePO₄ house-battery systems for camper vans, towables and motorhomes—configured around real loads, installation space and three charging sources.
12 / 24 Vhouse-battery platforms
1.28–10+ kWhscalable storage
3 inputssolar · alternator · shore
REAL USE / ONE SYSTEM
Comfort off-grid without guessing the battery size.
Work & kitchen
Laptops, TV, coffee makers and microwaves add AC demand; inverter rating and surge current must be checked together.
Longer stays
Solar yield, alternator charging and shore-power availability decide how quickly the battery can recover—not capacity alone.
COMMON RV SYSTEM SIZES
Four useful starting points.
These are reference architectures, not universal kits. Final capacity depends on daily energy, simultaneous loads, climate, cable length and available charging.
Compact
Camper van / small towable
- Battery bank
- 12.8V 100Ah
- Inverter
- 1,200 VA
- Solar reference
- 200–220 W
- Typical loads
- Lights, fan, laptop, small TV, phones
Touring
Medium 12V RV
- Battery bank
- 12.8V 200Ah
- Inverter
- 2,000 VA
- Solar reference
- 400–440 W
- Typical loads
- Plus fridge, coffee maker, small microwave
Comfort
Medium / large 12V RV
- Battery bank
- 12.8V 400Ah
- Inverter
- 3,000 VA
- Solar reference
- 600–700 W
- Typical loads
- More AC use, e-bikes, short high-power loads
High-power
Large coach / long cable runs
- Battery bank
- 25.6V 200–400Ah
- Inverter
- 3,000–5,000 VA
- Solar reference
- 1.0–1.7 kW
- Typical loads
- Larger appliances; A/C only after load study
Reference values align with current published RV system examples from major component makers. 120V or 230V AC output is selected for the destination market.
APPLICATION SIZING TOOL
Build an RV power starting point.
Separates DC energy, inverter loads, autonomy and roof-solar recovery.
Planning result
Daily energy
2.13 kWhBattery minimum
2.81 kWhBattery capacity
219 AhInverter starting point
2500 WSolar array starting point
650 WAir conditioning and electric water heating require a separate duty-cycle and thermal study.
Planning estimate only. Final BMS, cable, fuse, charger and inverter settings must be checked against exact equipment data and local rules.
THREE WAYS TO RECHARGE
Design the battery as part of the vehicle.
A dependable RV system coordinates the battery, BMS, protection, charging and monitoring. Each energy source needs its own correctly rated path.
Solar → MPPT
Roof or portable panels feed an MPPT controller sized for array voltage, current and battery voltage.
Alternator → DC-DC
A current-limited DC-DC charger protects the alternator and gives LiFePO₄ the correct charging profile.
Shore power → inverter/charger
Campground or household AC powers loads and charges the house bank through the correct 120V or 230V equipment.
Minimum engineering checklist
- LiFePO₄-compatible BMS with charge and discharge protection
- Main fuse close to the battery, branch protection and covered busbars
- Cable size and terminals verified for continuous current, surge and voltage drop
- Low-temperature charge protection where freezing is possible
- Battery monitor, secure mounting and service access
- Model-specific UN 38.3 / transport documents and destination compliance review
SIZE BY ENERGY, THEN POWER
A simple brief prevents an expensive mismatch.
1. List energy
For each appliance: watts × hours used per day = Wh/day. For cycling loads such as a refrigerator, use measured or manufacturer daily consumption.
2. Add real-world margin
Allow for inverter loss, standby draw, cold weather, battery ageing and days without full charging.
3. Check peak power
Add simultaneous loads and verify starting surge. Battery BMS, inverter, fuse and cables must all support it.
4. Check recharge
Compare daily Wh consumed with realistic solar, alternator and shore-power charging—not panel nameplate alone.
Planning example
If daily loads total 1,600Wh and you plan around 80% usable storage, the minimum nominal bank is about 2,000Wh before adding reserve days: 1,600 ÷ 0.8 = 2,000Wh.
OEM / CUSTOM BUILD
Built for the compartment—not forced into it.
LithVolt can configure the enclosure, voltage, capacity, BMS, heating, communications and terminals around an OEM or conversion project.
PRODUCTS · SIZE BY ENERGY, THEN POWER →＋12.8V and 25.6V LFP platforms
＋100–400Ah reference modules
＋CAN / RS485 / Bluetooth options
＋Metal or reinforced polymer enclosure
＋M8 terminals, service disconnect and custom harness
＋Sample validation before production
Runtime and solar recovery vary with the actual appliance duty cycle, temperature, irradiance, installation and system losses. High-power appliances—especially air conditioning and electric water heating—require a project load study.
RV PROJECT BRIEF
Send the load list. Get the right battery architecture.
Include vehicle type, destination, DC and AC loads, daily runtime, available roof area, alternator data, installation space and expected quantity.