What Size Battery Do You Need for Your Caravan?
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Battery sizing sounds complicated until you break it into two questions: what are you running, and how long are you staying out without a powered site? Everything else follows from there.
The Full DCX Range at a Glance
| Battery | Capacity | Chemistry | Warranty | Best For |
|---|---|---|---|---|
| DCX 12V 628Ah | 8kWh | LFP | 7 years | Weekend & extended touring |
| DCX 12V 942Ah | 12.1kWh | LFP | 7 years | Full-time 12V living |
| DCX 48V 7.1kWh | 7.1kWh | NMC | 5 years | Entry point to 48V |
| DCX 48V 14.3kWh | 14.3kWh | NMC | 5 years | Multiple high-draw appliances |
| DCX 48V 16.1kWh | 16.1kWh | LFP | 7 years | Full-time off-grid, flagship |
Step 1: List What You're Running
Fridge and lighting are the baseline for almost every setup. From there, ask what else you want to run without hesitation:
- Just the basics (fridge, lights, charging) → smaller capacity is fine
- Occasional coffee machine or induction cooktop → mid-range capacity
- Air conditioning, induction, and hot water together → you need the headroom of a 14.3kWh or 16.1kWh system
Step 2: Decide How Long You're Staying Out
A weekend trip and full-time living have very different power needs, even with identical appliances — because time without recharge access compounds. The 628Ah and 7.1kWh batteries are genuinely sized for shorter stints; if you're not coming back after the weekend, size up.
Step 3: Match Chemistry to Your Priorities
LiFePO4 (LFP) batteries — the 628Ah, 942Ah, and flagship 16.1kWh — carry a 7-year warranty and 8,000+ cycle design life, the longest in the range. The NMC-chemistry 7.1kWh and 14.3kWh carry a 5-year warranty and 4,500 cycles — still robust, but a different trade-off if long-term cycle life is your top priority.
Still Not Sure?
If you'd rather not piece together a battery, inverter, and solar setup yourself, the Off-Grid Packages do the matching for you across three tiers — Weekend Escape, Touring, and Full-Time.
Frequently Asked Questions
What's the difference between Ah and kWh?
Ah (amp-hours) measures capacity at a specific voltage; kWh (kilowatt-hours) is the actual usable energy, which is what really determines how long you can run your appliances. Always compare kWh, not just Ah, across different voltage platforms.
Is bigger always better?
No — a bigger battery costs more, weighs more, and takes longer to fully recharge. Size to your actual usage, not the maximum available.
Can I run my air conditioner on any DCX battery?
Technically most can start an A/C unit briefly, but sustained A/C runtime is really where the 14.3kWh and 16.1kWh systems are built to perform without rationing other appliances.
Does chassis-mount installation affect sizing?
No — chassis-mount is about where the battery lives (bolted between your steel frame rails, not in a cupboard), not how much capacity you choose. Sizing decisions are the same either way.
What if I'm between two sizes?
Size up if you're between two capacities — running short on power off-grid is a bigger inconvenience than carrying slightly more capacity than you strictly need.
Find the Right Power System — talk to an expert if you want a second opinion on sizing.
