Travel Trailer vs Van Electrical System: Key Differences
· 3 min readElectrical System
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Travel trailers and van builds share the same 12V fundamentals, but differ in how they're designed, what comes from the factory, and what the primary power source is.
Travel trailer electrical: the factory setup
Most travel trailers (Airstream, Lance, Heartland, Grand Design, Keystone, Jayco) come with:
- 30A shore power inlet (some larger trailers: 50A)
- Converter/charger: Charges the 12V house battery from shore power; often a basic Progressive Dynamics or Parallax unit
- 12V distribution: A 12V fuse panel for lights, water pump, fans, fridge (if 12V), and accessories
- House battery: 1–2 Group 27 or 31 batteries, usually AGM (some newer trailers offer LiFePO4)
- Propane: Most travel trailers use propane for cooking, heating, and sometimes the fridge (3-way absorption fridge)
- Solar: Increasingly common on newer trailers; often 100–200W standard with a basic PWM controller
What's usually NOT included at baseline: a proper inverter, adequate solar for boondocking, LiFePO4 batteries, a battery monitor.
Van build electrical: the custom approach
A van build typically starts from scratch with a blank cargo area. You design and install every component. The advantage: optimized for your specific use case. The disadvantage: it takes time and expertise.
Key operational differences
Primary charging source:
- Travel trailer: Shore power (campground hookup) is typically primary; solar is supplementary
- Van build: Solar is typically primary; alternator (DC-DC charger) is secondary; shore is occasional
Shore power connection:
- Travel trailer: Shore power cord hangs from the trailer — standard campground hookup
- Van build: If shore is included, it's a flush-mounted inlet (NEMA TT-30); not all van builds include shore power
12V charging from tow vehicle:
- Travel trailer: 7-pin connector provides a 12V charging circuit from the tow vehicle
- Van build: DC-DC charger from the van's own alternator (no 7-pin connector needed)
Battery size expectations:
- Travel trailer: Factory banks are often 100–200Ah AGM — enough for 1–2 nights with hookups, limiting for boondocking
- Van build: Builders size for their actual use case; 200–300Ah LiFePO4 is common
120V AC access:
- Travel trailer: 120V outlets work on shore power via the transfer; inverter needed for off-grid 120V
- Van build: Same — inverter needed for off-grid 120V
Upgrading a travel trailer for boondocking
- Replace AGM with LiFePO4: Same process as any RV — drop-in replacement in same group size
- Upgrade converter to LiFePO4-compatible: Victron IP22, Progressive Dynamics PD9130LV, or similar
- Add MPPT solar controller + expand panels if factory solar is inadequate
- Add inverter for 120V without shore power
- Add battery monitor (Victron SmartShunt + app)