Everything You Need To Know About Your Caravan’s Power, Water & Gas

Your caravan’s power, water, and gas systems are the foundation of comfortable off-grid living. Understanding how these work, what can go wrong, and how to maintain them will determine whether your Big Lap is a dream adventure or a series of frustrating breakdowns.

These three systems work together to provide everything you need for extended travel: electricity for lights, fridges, and devices; fresh water for drinking, cooking, and cleaning; and gas for cooking, heating, and often powering your hot water system. Get them right, and you’ll have all the comforts of home wherever you park.

Your Caravan’s Power System

Most caravans run on a 12V DC electrical system, though many also include 240V AC power through an inverter or when connected to mains power. Your power system includes batteries, charging sources (solar panels, alternator, mains), a management system, and the various appliances that consume power.

Battery Types and Capacity

The heart of your power system is your battery bank. Traditional deep-cycle lead-acid batteries cost $150-400 each but require regular maintenance and have limited lifespan. AGM batteries ($250-600 each) are sealed and maintenance-free but still heavy. Lithium batteries ($800-2000 each) are lighter, last longer, and charge faster, making them increasingly popular for serious travellers.

Battery capacity is measured in amp-hours (Ah). A typical setup might include two 100Ah AGM batteries (200Ah total) or a single 200Ah lithium battery. Your actual usable capacity is about 50% for lead-acid, 80% for AGM, and 95% for lithium batteries.

Charging Sources

Your batteries need regular recharging, and most caravans use multiple charging sources. Solar panels (typically 200-800 watts total) provide free power during daylight hours and are essential for extended off-grid camping. Your tow vehicle’s alternator charges batteries while driving, though this may require a DC-DC charger to optimise charging of modern battery types.

Mains power (240V hookup) at caravan parks provides unlimited power and fast battery charging through your van’s built-in charger. Some travellers also carry portable generators for cloudy periods or high power needs, though these are noisy and burn fuel.

Power Management

A battery management system monitors your power levels and prevents damage from overcharging or deep discharge. Basic systems show voltage levels, while advanced units display actual amp-hours remaining, charging current, and power consumption.

Inverters convert 12V DC power to 240V AC for running household appliances. Pure sine wave inverters ($300-800) are essential for sensitive electronics, while modified sine wave units ($100-300) suit basic appliances but can damage some devices.

Fresh Water & Plumbing

Your caravan’s water system includes fresh water storage, a pump to pressurise the system, and plumbing to taps, shower, and toilet. Understanding this system prevents water damage and ensures reliable supply during your travels.

Water Storage

Most caravans carry 80-200 litres of fresh water in built-in tanks, usually made from food-grade polyethylene. Tank placement affects weight distribution and accessibility for cleaning. Some vans include multiple tanks for better weight distribution or emergency backup.

Water weighs 1kg per litre, so a full 150-litre tank adds 150kg to your van’s weight. Factor this into your payload calculations, especially when combined with full grey and black water tanks.

Water Pump and Pressure

A 12V water pump pressurises your system, typically providing 20-60 PSI pressure. Most pumps are self-priming and include a pressure switch that automatically starts when you open a tap. Quality pumps like Seaflo or Jabsco cost $150-400 and should run quietly with minimal pulsing.

An accumulator tank ($80-150) smooths out pressure fluctuations and reduces pump cycling, extending pump life and improving water flow consistency. This small pressurised tank stores water under pressure to meet small demands without starting the pump.

Hot Water Systems

Caravan hot water systems typically hold 10-25 litres and heat water using gas, electricity, or both. Gas heating is faster and doesn’t drain your batteries, while electric heating (when available) is convenient and silent. Combination systems offer flexibility but cost more initially.

Instant gas hot water systems heat water on-demand, providing unlimited hot water without storage tank weight. These units cost $800-1500 but save weight and never run out of hot water, making them popular for extended travel.

Grey and Black Water

Grey water from sinks and shower typically drains to a 60-100 litre tank beneath your van. Black water (toilet waste) goes to a separate 20-40 litre cassette or tank system. Both must be emptied regularly at designated dump points.

Biodegradable soaps and toilet chemicals break down waste and control odours. Avoid household detergents that can harm septic systems at dump points. Quality toilet chemicals cost $15-25 per bottle but significantly improve the emptying experience.

LPG Gas System

Liquefied petroleum gas (LPG) powers your stove, oven, hot water system, and often your fridge and heating. Understanding gas safety and system components is crucial, as gas leaks can be dangerous.

Gas Bottles and Regulators

Most caravans carry two 9kg gas bottles, providing 18kg total capacity. This typically lasts 3-6 weeks depending on usage, climate, and whether your fridge runs on gas. Bottles must be stored in ventilated compartments with drain holes, as LPG is heavier than air.

An automatic changeover regulator ($80-150) switches between bottles when one empties, ensuring continuous gas supply. Manual changeover systems are cheaper but require monitoring and manual switching. Both systems include a regulator that reduces bottle pressure (high) to appliance pressure (low).

Gas Appliances

Your cooktop and oven use pilot lights or electronic ignition to burn gas for cooking. Three-way fridges can run on gas, 12V DC, or 240V AC power, automatically switching between sources. Gas operation is most efficient for extended off-grid camping but requires level positioning and good ventilation.

Gas hot water systems heat water faster than electric but consume more gas. A typical unit uses 150-250g of gas per hour of operation, so a shower might consume 100-150g of gas depending on length and water temperature preferences.

Gas Safety

Gas detectors ($50-100) monitor for leaks and should be installed near floor level in the main living area. Test them monthly and replace batteries annually. If you smell gas, extinguish all flames, don’t operate electrical switches, ventilate the area, and turn off gas at the bottle.

Flexible gas lines should be replaced every five years or if they show signs of wear, cracking, or damage. Use only certified gas fitters for any modifications or repairs to your gas system.

How Systems Work Together

Your power, water, and gas systems don’t operate independently. Understanding their interactions helps optimise performance and identify problems when they occur.

Power Dependencies

Your water pump runs on 12V power, consuming 3-8 amps when operating. Hot water systems may use electric elements that draw 10-15 amps when heating. Gas appliances need 12V power for electronic ignition, control systems, and sometimes fans or circulation pumps.

The fridge is often your largest power consumer when running on 12V, using 4-8 amps continuously. Running it on gas saves significant battery power during extended off-grid periods, though you’ll need to ensure adequate gas supply and proper ventilation.

Climate Considerations

Hot weather increases fridge power consumption and water usage for showers and cooling. Cold weather increases gas consumption for heating and hot water, while reducing solar panel efficiency. Plan consumption patterns and refill schedules around seasonal variations.

Humidity affects gas appliance efficiency and can cause condensation problems. Ensure adequate ventilation when using gas appliances, especially in enclosed spaces during wet weather.

Maintenance & Troubleshooting

Regular maintenance prevents system failures and extends component life. Establish weekly, monthly, and seasonal maintenance routines to keep everything running smoothly.

Weekly Checks

Monitor battery voltage and water levels (for flooded batteries). Check gas bottle levels using built-in gauges or by weighing bottles. Test gas appliances for proper ignition and flame colour. Inspect water pump operation and check for leaks around fittings.

Clean solar panels weekly or after dusty conditions. Even thin dust layers can reduce output by 10-20%. Fresh water tanks should be monitored for consumption rates and refilled before running dry.

Monthly Maintenance

Test gas and smoke detectors using test buttons. Check battery terminals for corrosion and clean if necessary. Inspect water pump filter and clean or replace if dirty. Run generator (if fitted) for 30 minutes under load to prevent fuel deterioration.

Sanitise water tanks monthly using appropriate sanitising products. This prevents bacteria growth and maintains water quality during extended travel.

Common Problems and Solutions

Low water pressure usually indicates a clogged pump filter, air in the lines, or failing pump. Fluctuating pressure suggests you need an accumulator tank or the existing one has lost pressure.

Gas appliances failing to ignite often indicate low battery voltage, dirty thermocouples, or moisture in gas lines. Yellow flames instead of blue indicate insufficient air supply or dirty burners requiring cleaning.

Batteries not holding charge may indicate sulfation (lead-acid), damaged cells, or charging system problems. Check connections first, then test charging sources and consider battery replacement if problems persist.

Upgrading Your Systems

Most travellers upgrade their systems based on experience and changing needs. Popular upgrades include larger battery banks, additional solar panels, lithium battery conversions, and improved monitoring systems.

Power System Upgrades

Adding solar panels increases charging capacity for extended off-grid camping. Installation costs $200-400 per 100W panel including controller and wiring. Lithium battery upgrades provide more usable capacity in less weight but require compatible charging systems.

Advanced battery monitors ($300-600) provide accurate state-of-charge readings and consumption tracking. These help optimise usage patterns and prevent damaging deep discharge cycles.

Water System Improvements

Larger fresh water tanks extend off-grid capacity but add significant weight. External water bladders ($100-300) provide temporary extra capacity without permanent weight penalties.

Water filtration systems ($200-800) improve water quality and taste while reducing reliance on bottled water. Multi-stage filters remove sediment, chemicals, and bacteria from various water sources.

Gas System Enhancements

Gas level monitors ($150-300) provide accurate bottle level readings without weighing bottles. Dual-bottle automatic changeover systems ensure continuous supply and indicate when bottles need refilling.

External gas points allow connecting portable appliances like BBQs or heating without disconnecting internal systems. These cost $80-150 installed and improve convenience for outdoor cooking.